Natural gas engine idling fluctuation control strategy

Abstract

The invention discloses a natural gas engine idling fluctuation control strategy. The natural gas engine idling fluctuation control strategy is applicable to a gas motor vehicle and comprises the following steps: enabling the engine to enter the idling state; carrying out PID regulation; enabling the engine to enter the idling fluctuation state; reserving the torque for the first time; reserving the torque for the second time; checking an ignition angle look-up table; and carrying out fluctuation elimination. The natural gas engine idling fluctuation control strategy disclosed by the inventionis added with the engine idling torque reserving process, so that when the engine is mutually transformed between the normal idling state and the state of idling during the start-up of vehicle-mounted equipment, the torque of the engine can be corrected by utilizing an ignition angle through the regulation of torque reserves, the idling fluctuations of the engine can be reduced, and the idling responsiveness of the engine can be improved; accordingly, the smooth transition of the engine between the normal idling state and the state of idling during the start-up of the vehicle-mounted equipment can be achieved, the running of a complete vehicle can be smooth and steady, and the driving comfort of the complete vehicle can be improved; even if the running process is in progress, the engine can be protected against flameout; and then the power-assisted steering failure of the complete vehicle can be avoided as well as the life safety of a driver and passengers can be protected.

Description

technical field [0001] The invention relates to the technical field of natural gas engine control, in particular to an idle speed fluctuation control strategy of a natural gas engine. Background technique [0002] At present, the gas engines used in the gas bus market are all low-power natural gas engines. The idle speed and air conditioner idle speed control strategy is the traditional idle speed PID control. The engine air intake is adjusted by controlling the PID to achieve the purpose of idle speed stability control. Taking a gas bus as an example, the gas bus is equipped with a low-power natural gas engine, the engine idle torque is small, and the power of the matching air-conditioning compressor is relatively large. Therefore, when the air-conditioning compressor is turned on, the engine speed is driven The resulting negative work will cause the engine speed to drop sharply, and even cause the engine to stall, thus causing a series of hazards, such as: [0003] (1) En...

AI Technical Summary

Problems solved by technology

[0003] (1) Engine idle speed fluctuations lead to abnormal fluctuations in the vehicle, which reduces the driving comfort of the vehicle;

[0004] (2) If the engine stalls due to turning on the air conditioner during driving, it will cause the power steering of the vehicle to fail, and the driver cannot turn the steering wheel, which will easily cause traffic accidents and endanger the lives of the driver and passengers

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