Extended-range hybrid gas vehicle starting control method

Abstract

The invention discloses an extended-range hybrid gas vehicle starting control method. The method comprises the following steps that when an engine needs to be started and charged, a motor firstly drags the engine to a certain rotating speed and then releases the engine, and meanwhile, when the engine reaches an ignition rotating speed in the process of being dragged by the motor, jet ignition combustion is controlled to be started successfully; after the engine is successfully started, idling operation is carried out for a period of time, and after the idling operation of the engine is finished, a vehicle control unit sends instructions to the motor and the engine, specifically, the vehicle control unit sends a rotating speed target instruction to the motor, and the motor drags the engineto transit from idling to the target rotating speed at a certain slope; and after the engine reaches the target rotating speed, the vehicle control unit sends a load instruction to an engine controller, the load instruction is transited from an initial load to the target load at a certain slope, then the engine responds to the target load at the same slope, and starting is completed. The method has advantages that NOx emission in a starting process is reduced, emission durability of the whole vehicle is improved, higher emission regulation requirements are met and so on.

Description

technical field [0001] The invention relates to the technical field of start-up control of a hybrid vehicle engine, in particular to a start-up control method for a range-extended hybrid gas vehicle. Background technique [0002] The range-extended hybrid gas vehicle has the problem of high NOx emissions during the start-up process (the engine of the range-extended hybrid gas vehicle is used as power generation, and the operating condition is single and stable. After the engine is started, it basically operates under steady-state conditions, and the NOx emission is basically close to 0. ), aiming at the problem of high NOx emissions during the start-up process, the method of optimizing engine start-up control is currently used to reduce NOx emissions to a certain level. At present, the start-up control strategy of the extended-range hybrid gas vehicle is that the engine speed and load change to the target speed and load at an extremely fast speed during the start-up process....

AI Technical Summary

Problems solved by technology

At present, the start-up control strategy of the extended-range hybrid gas vehicle is that the engine speed and load change to the target speed and load at an extremely fast speed during the start-up process. The speed and load change sharply, and the air-fuel ratio is difficult to control accurately, and it is affected by the temperature during the start-up process. , high NOx emissions during start-up, and poor consistency

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