57 results about "Bi-fuel vehicle" patented technology

The invention relates to the technical field of automotive inspection and discloses a diagnostic device for vehicle fuel evaporation leakage and a diagnostic method thereof. The device comprises a pumping management system and a fuel evaporation leakage diagnostic system. The pumping management system comprises a gas circulation valve, a Venturi valve and a turbocharged engine. The gas circulationvalve is connected with the fuel evaporation leakage diagnostic system through an inlet end of the gas circulation valve, connected in sequence with a first branch pipeline and the Venturi valve through a first outlet end of the gas circulation valve and connected in sequence with a second branch pipeline and the turbocharged engine through a second outlet end of the gas circulation valve respectively. Air pumping is conducted on the fuel evaporation leakage diagnostic system through the first branch pipeline and the second branch pipeline by the pumping management system. The diagnostic method is applicable to automobiles with turbocharged engines and dual-fuel automobiles. According to the diagnostic device for vehicle fuel evaporation leakage, the structure is simple; and the problem that in the prior art, leakage diagnosis of the automobiles with the turbocharged engines and dual-fuel automobiles cannot be achieved is solved.

The invention discloses a LNG (Liquefied Natural Gas) mobile filling vehicle with a filling structure and belongs to the technical field of low-temperature liquid mobile filling, storing and transporting vehicles. The LNG mobile filling vehicle with the filling structure comprises a tractor vehicle, a LNG low-temperature storage tank, a tank bottom type filling mechanism, a special semi-trailer chassis walking mechanism, a rear operation pipeline and a bin body, wherein the LNG low-temperature storage tank, the tank bottom type filling mechanism, the rear operation pipeline and the bin body are mounted on the special semi-trailer chassis walking mechanism so as to form a low-temperature liquid semi-trailer; the low-temperature liquid semi-trailer is suspended on a traction seat of a traction 1 by means of a traction pin so as to form a whole vehicle. The LNG mobile filling vehicle with the filling structure not only has the function of stopping in any place at any time for independently filling LNG for LNG vehicles and dual-fuel vehicles, but also has the transportation function of transporting LNG by the road; meanwhile, the LNG mobile filling vehicle with the filling structure not only has the function of stopping in a fixed place at any time for independently filling LNG for LNG vehicles and dual-fuel vehicles, but also has the transportation function of transporting LNG by the road. Due to the lightweight design of the whole vehicle, the whole vehicle is relatively light in weight and relatively large in maximum filling weight or filling quantity.

A method of controlling fuel injection of a bi-fuel vehicle running on gasoline and liquefied petroleum gas (LPG), and more particularly, a method of controlling fuel injection of a bi-fuel vehicle having an engine running on gasoline and LPG, capable of simultaneously controlling supply systems and injectors of fuels and switching the fuels in response to a fuel switch request based on an injection ratio and an injection time of each fuel is provided. Thus, fuels may be switched stably and efficiently, output reduction and exhaust gas increase due to deviation of an air-fuel ratio while switching fuels may be prevented, and fuels may be appropriately switched. Furthermore, mechanical stress generated while switching fuels may be minimized and stable driving may be provided. Accordingly, the reliability of a bi-fuel vehicle simultaneously using gasoline and LPG may be improved and the competitiveness of bi-fuel vehicle products may also be improved.

The invention provides a fuel switching control method for a dual-fuel vehicle. The method includes: starting an engine of the dual-fuel vehicle in the gasoline state; judging whether the dual-fuel vehicle meets the conditions or not, including whether a switch of the dual-fuel vehicle is at a CNG position or not, whether engine water temperature of the dual-fuel vehicle is above the standard value or not, whether running time of the engine of the dual-fuel vehicle meets switching delay or not, whether engine speed of the dual-fuel vehicle is increased to above the standard value or not, and whether gas relative pressure of the dual-fuel vehicle is larger than the standard value or not; if the dual-fuel vehicle meets the conditions, switching to the gas state. The method has the advantages that the system still continues to operate by gasoline even when a driver mistakenly presses the switch when a gas storage cylinder closes, the alarm of gas insufficiency can also be sent out, and accordingly flameout is avoided.

The invention aims to provide a fuel supply system of a double-fuel automobile, comprising a main fuel tank, an assistant fuel tank, a main fuel passage and an assistant fuel passage, wherein the mainfuel tank is communicated with a main fuel track in an engine by the main fuel passage; the assistant fuel tank is communicated with an assistant fuel track in the engine by the assistant fuel passage and the main fuel passage and the assistant fuel passage are both provided with filters for filtering fuel and pressure regulators for regulating the pressure of the fuel tanks. The fuel supply system is characterized in that the main fuel tank and the assistant fuel tank are both provided with gravity valves which are communicated with a carbon can by a three-way valve; the carbon can is communicated with a gas inlet branch pipe of the engine by an electromagnetic valve controlled by an ECU and the carbon can is also provided with an atmosphere port. The fuel supply system is used for supplying fuel to the engine by two fuel supply fuel passages, thereby solving the problem of difficult cold starting of methanol fuel; and the two fuel supply passages share the carbon can, thereby the cost is reduced on the premise of ensuring that the evaporation discharge of fuel oil is effectively controlled.

An apparatus and a method for controlling fuel supply of a bi-fuel vehicle includes: a gasoline fuel unit injecting gasoline fuel to a combustion chamber of an engine; an LPG fuel unit injecting LPG fuel to the combustion chamber of the engine; and an engine controlling unit selectively using the gasoline fuel and the LPG fuel according to an operation mode of a vehicle, and the engine controlling unit enters a limp home mode according to a state of the LPG fuel unit and uses fuel different from fuel used in a driving mode as driving fuel in the limp home mode.

A fuel filling apparatus and method for a bi-fuel vehicle using both gasoline and liquefied petroleum gas (LPG) as a fuel are provided to. The fuel filling apparatus and method are capable of temporarily burning a portion of LPG fuel after collecting the fuel portion, using a gasoline fuel tank and a canister, when the internal pressure of an LPG fuel tank in the bi-fuel vehicle is equal to or greater than an LPG filling pressure of a filling gun. Additionally, the internal pressure of the LPG fuel tank is decreased to a level below the LPG filling pressure of the filling gun, thereby achieving smoother LPG fuel filling of the LPG fuel tank by the filling gun.

The invention discloses a dual-fuel automobile fuel feed control method and system and belongs to the technical field of vehicle control. The method includes the steps that when an engine is in a gas combustion state, an electronic control unit detects the working condition of a pressure sensor; when the pressure sensor works normally, the electronic control unit receives a pressure signal input by the pressure sensor, wherein the pressure signal is used for representing the value of pressure in a fuel gas cylinder; when the time in which the value of the pressure in the fuel gas cylinder is continuously smaller or equal to a preset pressure valve is longer than or equal to a preset duration, the engine is controlled through the electronic control unit to be switched to an oil combustion state. According to the method, fuel switching control can be achieved accurately according to the allowance of gas in the fuel gas cylinder so that frequent oil and gas switching caused by signal fluctuation occurring when high pressure of the gas cylinder gets close to and quits a boundary point can be avoided.

The engine system of electrically-operated dual-fuel automobile modified by using mechanical diesel oil vehicle is characterized by adding natural gas feeding system, electric control unit, sensor signal acquisition system and two linear electromagnets on the mechanical diesel oil vehicle. Said invention can reasonably use two kinds of fuels, improve its tail exhaust gas, possesses good dynamic behaviour and its control system is simple, easy to implement, safe and reliable.

The invention discloses a dual-fuel automobile airtightness and ventilation detection apparatus and a control method thereof. The detection apparatus is connected with air, a diagnosis interface of an automobile, and an air supply system of the whole automobile, the air supply system of the whole automobile includes a high pressure air supply system and a low pressure air supply system that are communicated through an air guide pipe, the air guide pipe is provided with a pressure-reducing valve electrically connected with the diagnosis interface, the high pressure air supply system includes an automobile charge valve, and the low pressure air supply system includes a combustion gas filter electrically connected with the diagnosis interface. The dual-fuel automobile airtightness and ventilation detection apparatus has the characteristics of high airtightness and ventilation detection precision, high intelligent degree, low artificial cost, simple operation, and high detection efficiency.

An apparatus and a method for controlling fuel supply of a bi-fuel vehicle includes: a gasoline fuel unit injecting gasoline fuel to a combustion chamber of an engine; an LPG fuel unit injecting LPG fuel to the combustion chamber of the engine; and an engine controlling unit selectively using the gasoline fuel and the LPG fuel according to an operation mode of a vehicle, and the engine controlling unit enters a limp home mode according to a state of the LPG fuel unit and uses fuel different from fuel used in a driving mode as driving fuel in the limp home mode.

The invention relates to a part used for an automobile engine, in particular to an intake manifold applied to a dual-fuel automobile engine. The invention comprises an intake manifold body which is equipped with an intake manifold connecting seat used for connection, a fuel nozzle mount pad and an oil track mount pad which are integral with the intake manifold body are arranged at the position close to the intake manifold connecting seat, the fuel nozzle mount pad comprises two groups of nozzle mount holes, and the oil track mount pad is arranged above the air intake channel and provided with two groups of oil track mount holes. The invention mainly aims at providing a dual-fuel intake manifold which uses two groups of fuel nozzles to provide dual fuel, and the phenomena affecting the fuel nozzle performance between the two groups of fuel nozzles such as oil film deposition and coverage at the mount holes of the fuel nozzles do not appear; and the invention resolves the technical problems existing in the prior art that only single point injection is employed and meanwhile the lower fuel nozzle can produce oil film deposition and coverage, thus affecting the performance of the lower fuel nozzle.

A method and system for controlling safety of a bi-fuel vehicle may safely control the bi-fuel vehicle when it is in an accident. The method may include detecting a pressure of a vaporizer configured to decompress and vaporize liquefied petroleum gas (LPG) that is one fuel of the bi-fuel vehicle, determining whether the detected pressure of the vaporizer is equal to or higher than a predetermined high pressure, determining whether the detected pressure of the vaporizer is equal to or lower than a predetermined low pressure, determining whether an airbag has been inflated, and switching to a gasoline mode configured to use gasoline if at least one of the detected pressure is equal to or higher than the predetermined high pressure, the detected pressure of the vaporizer is equal to or lower than the predetermined low pressure, and / or the airbag has been inflated is determined to be true.

A fuel filling apparatus and method for a bi-fuel vehicle using both gasoline and liquefied petroleum gas (LPG) as fuel are provided to an LPG fuel tank. The fuel filling apparatus and method are capable of temporarily burning a portion of LPG fuel after collecting a fuel portion, using a gasoline fuel tank and a canister, when the internal pressure of the LPG fuel tank in the bi-fuel vehicle is equal to or greater than an LPG filling pressure of a filling gun. Additionally, the internal pressure of the LPG fuel tank is decreased to a level below the LPG filling pressure of the filling gun, thereby achieving smoother LPG fuel filling of the LPG fuel tank by the filling gun.

The invention discloses a gas tightness detection and nitrogen gas replacement system of a dual-fuel automobile and a controlling method thereof. The gas tightness detection and nitrogen gas replacement system is characterized in that a high-pressure gas storage device is used for storing high-pressure air and high-pressure nitrogen gas before gas tightness detection and nitrogen gas replacement, after the high-pressure air and the high-pressure nitrogen gas are stored, gas tightness detection and nitrogen gas replacement can be continuously performed by the stored gas in a certain time; when pressure values detected by a first pressure gauge and pressure values detected by a second pressure gauge are lower than corresponding lower limiting values in a standard pressure range; a high-pressure air tank is firstly aerated, and then a high-pressure nitrogen gas tank is aerated after aeration completion of the air tank. According to the system and the method, the gas tightness detection precision, the intelligent level, and the gas tightness detection and nitrogen gas replacement efficiency are high.

The invention discloses a fuel control device of a dual-fuel automobile. The device comprises a first fuel box, a first fuel pump, a fuel nozzle and an engine, and is characterized by also comprising a second fuel box and a second fuel pump; the first fuel box is filled with alcohol fuel, and is communicated with the fuel nozzle through the first fuel pump and a first fuel pipe; the first fuel pipe is provided with a first check valve which prevents the alcohol fuel from flowing reversely into the first fuel box; the second fuel box is filled with gasoline, and is communicated with the fuel nozzle through the second fuel pump and the second fuel pipe; the second fuel pipe is provided with a second check valve which prevents gasoline from flowing reversely into the second fuel box; the fuel nozzle is communicated with the second fuel box through an oil return pipe which is provided with a pressure valve; the device also comprises a relay which controls the second fuel pump; a normally closed contact of the relay is connected with a conversion switch, and the other normally closed contact is connected with a bond strap; and a normally open contact of the relay is connected with the second fuel pump, and the other normally open contact is connected with a normally used fire wire. Through the fuel control device, the engine starting of the automobile is not influenced by alcohol fuel, and the engine can be started normally.

Disclosed is method and apparatus for supplying fuel of LPG car having LPI system. More particularly, the present invention generates a gas fuel injection signal based on a gasoline fuel injection signal and directly injects LPG fuel within a fuel tank to a combustion chamber using the generated gas fuel injection signal to drive an engine. Therefore, an engine can be easily changed, the manufacturing cost of a duel car of LPG and gasoline can be reduced, and the manufacturing process thereof can be simplified.

The invention discloses a rail type gas injection method for a dual-fuel automobile. The rail type gas injection method involves a gas inlet pipe and a hollow pipe. A groove with the section being a major arc is formed in the inner wall of the hollow pipe, and injection holes right face the arc bottom of the groove. A plurality of electric heating pipes are installed in the groove. Guide blocks are installed at the bottoms of the electric heating pipes. Guide grooves matched with the guide blocks are formed in the bottom of the groove. Each electric heating pipe comprises a pipe body, an insulating material stuffed into the pipe body, and an electric heating wire arranged in the pipe body. The tail ends of the electric heating wires are connected with binding posts. The wiring posts penetrate through small holes to be connected with a wiring plugboard. The open end of the groove is covered with a heat conducting plate. The electric heating pipes are placed in the arc groove, the lateral end of the groove is sealed with the wiring plugboard, and therefore the electric heating pipes are conveniently taken and placed while heat loss can be reduced, that is, a user can determine the number of the electric heating pipes in real time according to the fuel gas supply quantity, and the effect that stable operation of the fuel gas output flow is completed at the minimum heating cost is guaranteed.

A fuel filling apparatus and method for a bi-fuel vehicle using both gasoline and liquefied petroleum gas (LPG) as a fuel are provided. The fuel filling apparatus and method are capable of temporarily burning a portion of LPG fuel after collecting the fuel portion, using a gasoline fuel tank and a canister, when the internal pressure of an LPG fuel tank in the bi-fuel vehicle is equal to or greater than an LPG filling pressure of a filling gun. Additionally, the internal pressure of the LPG fuel tank is decreased to a level below the LPG filling pressure of the filling gun, thereby achieving smoother LPG fuel filling of the LPG fuel tank by the filling gun.

The invention relates to a high-pressure pipeline leakage detection device used in dual-fuel vehicle safety detection. Positive pressure leak detection method is adopted, gas is used as the working medium, the medium gas is compressed to the required high pressure by a high-pressure gas generating device, injected into the high-pressure pipeline, and the actual working condition of the high-pressure pipeline is simulated. Then, detect with a medium leak detector. If there is a leak, the medium leak detector will inhale the leaked medium gas and analyze it to obtain a definite leak value and compare it with the standard leak value to determine whether it is a faulty leak. Thereby changing the previous qualitative detection method.

A method of controlling fuel injection of a bi-fuel vehicle running on gasoline and liquefied petroleum gas (LPG), and more particularly, a method of controlling fuel injection of a bi-fuel vehicle having an engine running on gasoline and LPG, capable of simultaneously controlling supply systems and injectors of fuels and switching the fuels in response to a fuel switch request based on an injection ratio and an injection time of each fuel is provided. Thus, fuels may be switched stably and efficiently, output reduction and exhaust gas increase due to deviation of an air-fuel ratio while switching fuels may be prevented, and fuels may be appropriately switched. Furthermore, mechanical stress generated while switching fuels may be minimized and stable driving may be provided. Accordingly, the reliability of a bi-fuel vehicle simultaneously using gasoline and LPG may be improved and the competitiveness of bi-fuel vehicle products may also be improved.

A method and system for controlling safety of a bi-fuel vehicle may safely control the bi-fuel vehicle when it is in an accident. The method may include detecting a pressure of a vaporizer configured to decompress and vaporize liquefied petroleum gas (LPG) that is one fuel of the bi-fuel vehicle, determining whether the detected pressure of the vaporizer is equal to or higher than a predetermined high pressure, determining whether the detected pressure of the vaporizer is equal to or lower than a predetermined low pressure, determining whether an airbag has been inflated, and switching to a gasoline mode configured to use gasoline if at least one of the detected pressure is equal to or higher than the predetermined high pressure, the detected pressure of the vaporizer is equal to or lower than the predetermined low pressure, and / or the airbag has been inflated is determined to be true.

The invention relates to a part used for an automobile engine, in particular to an intake manifold applied to a dual-fuel automobile engine. The invention comprises an intake manifold body which is equipped with an intake manifold connecting seat used for connection, a fuel nozzle mount pad and an oil track mount pad which are integral with the intake manifold body are arranged at the position close to the intake manifold connecting seat, the fuel nozzle mount pad comprises two groups of nozzle mount holes, and the oil track mount pad is arranged above the air intake channel and provided with two groups of oil track mount holes. The invention mainly aims at providing a dual-fuel intake manifold which uses two groups of fuel nozzles to provide dual fuel, and the phenomena affecting the fuel nozzle performance between the two groups of fuel nozzles such as oil film deposition and coverage at the mount holes of the fuel nozzles do not appear; and the invention resolves the technical problems existing in the prior art that only single point injection is employed and meanwhile the lower fuel nozzle can produce oil film deposition and coverage, thus affecting the performance of the lower fuel nozzle.

The invention discloses a fuel display control system and method for a double-fuel automobile. The fuel display control system for the double-fuel automobile comprises a fuel conversion switch, an engine management system, a combined instrument, a fuel gas pressure gauge, a fuel oil sensor and a power supply. The fuel conversion switch transmits a working mode level signal to the engine management system, the engine management system outputs the working mode signal to the combined instrument, the combined instrument reads fuel data and transmits the fuel data to a driver, and the driver drives a display unit to display the storage quantity of fuels. The fuel display control system for the double-fuel automobile can display the storage quantity of two fuels by using one display unit. According to the fuel display control method for the double-fuel automobile, display of the storage quantity of double fuels is realized on one display unit by switching the fuel conversion switch, the operation is convenient and fast, meanwhile, wiring of circuits can be reduced, and the cost is reduced.

The invention discloses a gas tightness detection and nitrogen gas replacement system of a dual-fuel automobile and a controlling method thereof. The gas tightness detection and nitrogen gas replacement system is characterized in that a high-pressure gas storage device is used for storing high-pressure air and high-pressure nitrogen gas before gas tightness detection and nitrogen gas replacement, after the high-pressure air and the high-pressure nitrogen gas are stored, gas tightness detection and nitrogen gas replacement can be continuously performed by the stored gas in a certain time; when pressure values detected by a first pressure gauge and pressure values detected by a second pressure gauge are lower than corresponding lower limiting values in a standard pressure range; a high-pressure air tank is firstly aerated, and then a high-pressure nitrogen gas tank is aerated after aeration completion of the air tank. According to the system and the method, the gas tightness detection precision, the intelligent level, and the gas tightness detection and nitrogen gas replacement efficiency are high.

An apparatus of charging Liquefied Petroleum Gas (LPG) fuel of a bi-fuel vehicle includes: a gasoline mixing chamber mounted on an LPG bombe side, a gasoline fuel supply line connecting the gasoline mixing chamber with a fuel tank and allowing gasoline fuel to move to the gasoline mixing chamber as a first valve is open, an LPG fuel supply line connecting an LPG bombe with the gasoline mixing chamber and allowing LPG fuel to move to the gasoline mixing chamber as a second valve is open, and a control unit configured to open the first valve and control the LPG fuel to be recirculated to the LPG bombe together with the gasoline fuel by a pressure of the LPG fuel moving to the gasoline mixing chamber, as an internal pressure of the LPG bombe reaches a predetermined reference pressure.

An intake manifold assembly for a dual-fuel automobile comprises an intake manifold (1) and a fuel rail assembly mounted on the intake manifold. Two fuel rail assemblies (2, 3) are mounted on the intake manifold. The ports of a fuel inlet pipe (4) and a fuel return pipe (5) of each fuel rail assembly are on the same side as the connecting ends of external soft tubes. The connecting ends of the first and second fuel rails are located at opposite ends of the intake manifold respectively. The intake manifold assembly is neatly arranged in the engine cabin, and the two types of fuel rail are clearly distinguished. The external soft tubes of the fuel rails can easily be distinguished and are conveniently arranged for disassembly and maintenance. The intake manifold assembly controls fuel injection accurately, and ensures the optimal performance of the engine.

A fuel system for a bi-fuel vehicle, which is provided with an engine and an LPG tank connected to each other through a fuel supply line and a fuel return line through which liquefied petroleum gas (LPG) fuel passes, includes: a 3-way valve which is installed in the fuel return line, and selectively opened and closed to move returning LPG fuel to a canister connected with a fuel tank; and a return tube, which branches off from the fuel return line, installed so that the returning LPG fuel passes through the canister in accordance with an operation of the 3-way valve, allowing the LPG fuel of which the temperature is decreased by heat exchange while the LPG fuel passes through the canister to move to the fuel return line.