40results about How to "Guaranteed fuel economy" patented technology

The invention provides a dual-mode hybrid vehicle dual-motor parameter matching method and device. The dual-mode hybrid vehicle dual-motor parameter matching method comprises the steps that first parameters are acquired, the first parameters are parameters of a first motor, and the whole vehicle is enabled to meet the preset requirement of fuel economy by the first parameters; and second parameters are acquired, the second parameters are parameters of a second motor, and the whole vehicle is enabled to meet the preset requirement of power performance by the second parameters. According to the method, power performance of the whole vehicle can be ensured and fuel economy of the whole vehicle can also be ensured in the parameter matching process.

The invention provides a limited variable-speech cruise method for a vehicle. By means of the vehicle internet, speed and power data of the vehicle during constant-speed cruise are collected, the power data are converted into gaussian distribution data with a load coefficient as a mathematical expectation through gaussianization, and different load coefficients are clustered from the gaussian distribution data; a speed and power characteristic curve is fitted from rotation speed and power historical data which the load coefficients belong to by means of a cubic polynomial; speed and power data of the vehicle are sampled in real time, are uploaded to a vehicle internet center and are matched with the characteristic curve fitted by the vehicle internet center, and accordingly a currently matched characteristic curve is obtained; oil consumption of the vehicle cruising at different speeds in a limited interval is predicted by means of rules of the matched characteristic curve, the cruising speed is trimmed from the limited interval to an engine economic interval according to the prediction result, and the aim of improving economy of oil consumption of the vehicle during cruising is achieved. By means of the limited variable-speech cruise method, oil conservation of the vehicle can be guaranteed in the whole cruising process, and the function of saving oil is automatically achieved.

The invention discloses a locking and unlocking device of a crawler-type engineering machinery hydraulic torque converter and a control method thereof. The locking and unlocking control parameters are the turbine revolution, gear shift signals and accelerator signals; the device comprises a turbine revolution speed sensor, a gear shift signal sensor, an accelerator signal sensor, a locking and unlocking mode selection switch, a micro computer controller, a brake signal sensor, a driving power supply and an electrohydraulic locking and unlocking device; the locking and unlocking mode selection switch, the turbine revolution speed sensor, the gear shift signal sensor, the accelerator signal sensor and other units collect data; the data are input in the micro computer controller; and the micro computer controller processes the input information, and outputs the information to the electrohydraulic locking and unlocking device, thus the locking and unlocking operations of the hydraulic torque converter are realized. Because three parameters are adopted to act as the locking and unlocking control parameters, the motive power performance and the economical efficiency are compatible, and the working efficiency and the comprehensive using performance of the engineering machinery hydraulic torque converter are improved obviously. The device provided by the invention has a simple structure, is convenient to operate and use, and has good stability and high reliability.

The invention discloses a hybrid electric vehicle power source power limiting method, belonging to the technical field of hybrid electric vehicle control. The method comprisesdetermining the upper andlower limits of battery output power and determining the upper and lower limits of motor output torque. The method takesthebattery, conditions of use of electric machines, fault state and its own characteristics for battery charging and discharging power, the output torque limit of the motor into account, whichcan effectively prolong the battery, the service life of the motor and improve the safety of the battery and the motor in the process of use, and at the same time output the larger power as far as possible to ensure the power and fuel economy, which is very important for the safety of passengers and vehicle components in the process of driving.

The invention discloses a starting power generation system for an auxiliary power unit for a vehicle. In the engine starting process, a permanent magnet motor is subjected to constant torque control to drive an engine to ignite, and when an engine speed reaches the idle speed, the output torque of the permanent magnet motor is controlled to be zero. In the power generation process, a running speedcommand of the engine and a torque command value of the permanent magnet motor are obtained through table look-up according to a generated power request of the system and a universal characteristic curve of the engine. The engine performs closed-loop control according to a speed command value obtained by table look-up, and the stability of the engine speed is realized by adjusting the engine throttle opening degree in real time. The permanent magnet motor obtains a torque current command value through table look-up according to a torque command, and realizes the current closed-loop control through a PI regulator. According to the starting power generation system for the auxiliary power unit for the vehicle, the starting torque is stable, and the engine can be successfully started; and thequality of electric energy is high during power generation, and the fuel economy of the engine is good.

The invention provides a hydraulic automatic gear shifting device of a crawler-type engineering machinery and a control method thereof. The hydraulic automatic gear shifting device is characterized in that shift control parameters are turbine revolutions and accelerator signals. The device comprises a turbine speed sensor, an accelerator signal sensor, a brake signal sensor, a gear shifting mode selection switch, a gear shifting signal sensor, an ECU (electronic control unit), a drive power supply and an electro-hydraulic gear shifting device, wherein the gear shifting mode selection switch, the turbine speed sensor, the accelerator signal sensor, the brake signal sensor and the gear shifting signal sensor are used for collecting data and then sending the data into the ECU (Electronic Control Unit); and the ECU is used for processing the input information and outputting the processed input information to the electro-hydraulic gear shifting device to realize the operation of gear shifting. According to the control method of the automatic gear shifting, the dynamic property and economical property of the drive system are considered; and the work efficiency and comprehensive performance of the crawler-type engineering machinery can be obviously improved.

The object of the present invention is to provide a pressure accumulating flow-limiting electromagnetic control fuel injector, including a fuel injector head, a fuel injector body, a current limiting assembly, a solenoid valve assembly, a needle valve return spring, a positioning pin, a nozzle, a needle valve, a needle Valve stoppers, seats, caps and seals. There is a pressure accumulator on the injector body, and the pressure accumulator is respectively connected with the main oil inlet hole on the injector head and the first oil through hole on the limit block, and the flow limiting component is installed in the injector body. The lower end of the flow limiting assembly communicates with the fuel oil passage in the injector body, the needle valve chamber communicates with the second oil chamber through the fourth oil inlet hole on the needle valve limit block, and the first oil chamber communicates with the second oil chamber through the third oil inlet hole on the valve seat. The oil inlet hole is connected with the high-pressure fuel oil circuit in the injector body, and the oil drain port is connected with the oil return port through the low-pressure oil circuit in the injector body. upper end. The invention has the advantages of fast response speed, high control precision, flexible fuel injection rule and stable operation when spraying with small fuel injection quantity.