63results about How to "Reduce idle speed" patented technology

A fuel injection control apparatus for an internal combustion engine which can inject a fuel injection quantity to a fuel injector with accuracy even when the fuel injection quantity is reduced than before is provided. A fuel injection control apparatus of a direct cylinder injection type of internal combustion engine, including a fuel injector which performs fuel injection by supplying a drive current to a solenoid, a fuel pressure sensor which detects fuel pressure supplied to the fuel injector, and operation state detecting means which detects the operation state of the internal combustion engine, comprises current profile changing means 100 which has multiple current profiles of the drive current and changes current profiles based on the operation state and the fuel pressure, valid pulse width calculating means 701 which calculates a valid pulse width for opening and driving the fuel injector, invalid pulse width calculating means 103 which calculates an invalid pulse width, and fuel injector control means which calculates a fuel injection pulse width based on the valid pulse width and the invalid pulse width, and controls the fuel injector based on the fuel injection pulse width, wherein the invalid pulse width calculating means 103 calculates an invalid pulse width corresponding to the current profiles to be changed before the current profiles are changed.

The vehicle-use power generation control apparatus regulates an output voltage of a vehicle generator driven by a vehicle engine at a set value by on / off controlling an excitation current flowing through an excitation winding of the vehicle generator The vehicle-use power generation control apparatus includes a rotation detecting circuit detecting a rotational speed of the vehicle generator, and an excitation current control circuit reducing, when the rotation detecting circuit detects decrease of the rotational speed, the excitation current at a rate depending on a rate of the decrease of the rotational speed detected by the rotation detecting circuit.

The invention discloses a load sensitive hydraulic system and a power controller thereof as well as a crane. The load sensitive hydraulic system comprises a proportional decompression valve, wherein the proportional decompression valve is arranged on an oil path between a control oil source and an oil inlet of a pilot-operated handle or is arranged on an oil path between a first oil outlet of the pilot-operated handle and a control end of a first main valve; and outlet pressure of the proportional decompression valve is preset so that when the pilot-operated handle is at the biggest opening degree, the output power of a load sensitive pump is matched with the output power of an engine. Compared with the prior art, the load sensitive hydraulic system has the advantages that the adaptability of the output power of the load sensitive pump and the output power of the engine can be improved, so that a lower engine idle speed can be selected and the power consumption is reduced; the great power can be output by an oil pump when the engine is operated at a high speed, and the energy efficiency is improved; and furthermore, the engine is effectively prevented from being stalled.

The invention discloses a control system, method and device of a concrete mixer as well as the concrete mixer. The control system, method and device are used for improving the energy-saving performance of the concrete mixer. The control system comprises a plurality of acquisition devices and a controller, wherein the acquisition devices are used for acquiring signals of the concrete mixer; and the controller is used for judging the current working condition of the concrete mixer according to a received speed signal and a received hydraulic pump pressure difference signal and outputting a corresponding control signal according to the determined working condition, and is also used for storing engine universal characteristic curves respectively corresponding to a load running working condition and a no-load running working condition. When the concrete mixer is in the load running working condition or the no-load running working condition and the received engine load rate is not in the set oil consumption economic limit, the displacement of a hydraulic pump is adjusted so as to adjust the stirring rate of the concrete mixer, so that the received engine load rate can be adjusted in real time so as to be in an oil consumption economic region of the engine universal characteristic curve corresponding to the current working condition.

A fuel injection system operates under a predetermined substantially constant pump speed and creates multi-pressure levels by diverting the fuel flow. Fuel pressure can be switched from one steady pressure level to another level on-demand instantly. This superimposes and overlaps typical fuel injection events in the linear operating ranges under different pressure levels, significantly increasing the fuel injection dynamic range. The dynamic range is further increased when another predetermined constant pump speed is assigned. Thus, the system saves fuel and reduces exhaust emission in city driving when gas pedal is released including idle. The same system can instantly deliver additional fuel on-demand for extra power beyond engine rating producing a sport-car-like performance.

An internal combustion engine idle speed control system includes a first valve control mechanism that adjusts a first operating parameter of a first cylinder valve. A control module determines an idle speed error and generates a first control signal to the first valve control mechanism to adjust the first operating parameter. The first control signal is based on the idle speed error.

A fuel injection control apparatus is capable of reducing a minimum quantity of fuel injection without reducing a maximum quantity of injection. To open a fuel injector valve, a driving circuit supplies an electric current from a high-voltage power supply to the fuel injector. Then, after valve opening, the high-voltage power supply is switched to a low-voltage power supply, and an open state of the valve is retained. For opening the valve of the fuel injector, a microcomputer, after supplying current from the high-voltage power supply to the injector, discharges the current rapidly for a decrease below a first current level at which the open state of the valve cannot be retained. The microcomputer then controls the supply current to the injector so as to supply a current at a second current level at which the open state of the valve can be retained.

A fuel injection control apparatus for an internal combustion engine which can inject a fuel injection quantity to a fuel injector with accuracy even when the fuel injection quantity is reduced than before is provided. A fuel injection control apparatus of a direct cylinder injection type of internal combustion engine, including a fuel injector which performs fuel injection by supplying a drive current to a solenoid, a fuel pressure sensor which detects fuel pressure supplied to the fuel injector, and operation state detecting means which detects the operation state of the internal combustion engine, comprises current profile changing means 100 which has multiple current profiles of the drive current and changes current profiles based on the operation state and the fuel pressure, valid pulse width calculating means 701 which calculates a valid pulse width for opening and driving the fuel injector, invalid pulse width calculating means 103 which calculates an invalid pulse width, and fuel injector control means which calculates a fuel injection pulse width based on the valid pulse width and the invalid pulse width, and controls the fuel injector based on the fuel injection pulse width, wherein the invalid pulse width calculating means 103 calculates an invalid pulse width corresponding to the current profiles to be changed before the current profiles are changed.

The present invention provides a system and method of adaptively setting the idle speed of an internal combustion engine based on instantaneous power requirements of the engine. By adaptively setting engine idle speed based on instantaneous power requirements of the engine as well as the power requirements of any auxiliary devices, the noise and exhaust emissions of the engine may be reduced as well as improving fuel consumption efficiency. The engine's electronic control unit (ECU) is designed to regulate an idle speed controller based on current feedback received from sensors operationally connected to the engine as well as the various auxiliary devices. The ECU regulates the idle speed control such that the engine electronics are sufficiently energized to run the engine, but the engine idle speed is also set to a level that takes into account the instantaneous power requirements of the various system components and / or devices.

The invention relates to a hybrid power type motor electric control silicone oil fan clutch. The hybrid power type motor electric control silicone oil fan clutch comprises a front cover, a driving disc, a rear cover, a flange shaft, a solenoid and a brushless motor, the rear cover is fixedly connected with a fan, the front cover is fixedly connected with the rear cover, the driving disc is arranged between the front cover and the rear cover, the flange shaft penetrates through the rear cover to be in threaded connection with the driving disc, the flange shaft is connected with an engine crankshaft or a belt pulley, the solenoid is arranged on the flange shaft and connected with an ECU, the brushless motor comprises a stator part and a rotor part, the rotor part is fixedly connected with the rear cover, and the stator part is fixed with an engine cylinder body. According to the hybrid power type motor electric control silicone oil fan clutch, the structure of a traditional electric control silicone oil fan is optimized, the brushless motor is introduced, the brushless motor and the traditional silicone oil fan are combined, the effect that the electric control silicone oil fan can comprehensively utilize electric energy, diesel oil, natural gas and other new energy is achieved, and the energy utilization rate is increased.

The invention provides an exhaust postprocessing device and method used for an engine. The exhaust postprocessing device comprises a postprocessing part used for conducting postprocessing on exhaust of the engine and arranged in an exhaust pipeline, a bypass branch and a bypass valve, wherein an inlet and an outlet of the bypass branch communicate to the exhaust pipeline located at the inlet end and the outlet end of the postprocessing part correspondingly; and the bypass valve is arranged in the bypass branch and used for enabling exhausted gas from the engine to wholly or at least partially bypass the postprocessing part according to commands of an electronic control unit of the engine.

A fuel injection control apparatus includes a computing unit that calculates a pulse width for a pulse signal which drives the valve of a fuel injector, based on the operational state of the internal combustion engine and fuel pressure detected by a fuel pressure sensor. After a valve-opening command has turned on and a high valve-opening current has been supplied to open the fuel injector valve, a fuel injector driving signal waveform command unit discharges the current and supplies a small hold current Ih2 to maintain the injector's valve-open state. After the elapse of a predetermined rapid-discharge starting time from the turn-on of the valve-opening command, the fuel injector driving signal waveform command unit rapidly discharges the current until the hold current Ih2 has been reached.

The invention is based on a rechargeable battery-operated hand machine tool (10) having an electric drive motor (18) accommodated in a housing (12) and powered by a rechargeable battery (20), which motor is used to drive a tool (16), and having an actuating means (14) for switching the drive motor (18) on and off.A mechanism (22) is provided, which is capable of reducing the discharging of the battery (20) during operation.

PROBLEM TO BE SOLVED: To eliminate instability in engine rotations due to repeated small and large variations in an idling rotation speed for each cycle.SOLUTION: A crank angular velocity variation amount calculation unit 36 detects a crank angular velocity variation amount &Dgr;ω representative of an engine load. A crank angular velocity variation amount determination unit 37 advances or retards an advance angle amount in the next cycle from a reference advance angle amount depending on whether the crank angular velocity variation amount &Dgr;ω is larger than an upper threshold H or lower than a lower threshold L set in a threshold setting unit 40. Accordingly, the angular velocity variation amount &Dgr;ω in the next cycle is held within an allowable range defined by the thresholds H and L in conformity with regularity with small and large variations for each cycle. The engine load may be represented by a mean effective pressure IMEP shown in the figure.