Control Method for Improving Idle Speed ​​Stability of Diesel Engine

Abstract

The invention discloses a control method for improving the idling stability of a diesel engine. The control method comprises the steps that 1, the learning torque of idling closed-loop control is checked; 2, if the learning torque is smaller than the self-learning torque minimum value, the self-learning torque minimum value serves as the torque self-learning value to be stored in an ECU, if the self-learning torque minimum value is smaller than the learning torque, the learning torque is smaller than the self-learning torque maximum value, the learning torque serves as the torque self-learningvalue to be stored in the ECU, and if the learning torque is larger than the self-learning torque maximum value, the self-learning torque maximum value serves as the torque self-learning value to bestored in the ECU; and 3, according to the water temperature of the engine, under the idling working condition, the ECU calls the corresponding torque self-learning value to be added with the load torque to calculate the total torque loss, and the total torque loss is used for calculating the initial torque of idling closed-loop control. The torque change brought by scatter difference and aging ofparts due to mass production can be corrected, the robustness of calibration data is improved, and the idling stability of the diesel engine is guaranteed.

Description

technical field [0001] The invention relates to the field of vehicle control, in particular to a control method for improving the idling stability of a diesel engine. Background technique [0002] With the gradual development of the automobile industry, people have higher and higher requirements for the driving performance of automobiles. A good car should not only have good performance in terms of fuel consumption, appearance, interior, etc., but also the driving comfort of the vehicle. Among them, drivability mainly includes start-up performance, idling speed stability, smoothness of acceleration and deceleration, vehicle speed stability during cruising, etc., and drivability performance has been paid attention to from the moment the diesel engine is started. When the vehicle is started, it first enters the idling condition, so the performance of idling stability is very important. A good idling stability can give customers a good impression. [0003] In the process of d...

AI Technical Summary

Problems solved by technology

But this kind of control is not fast enough and accurate, and it needs a relatively long time to adjust, and it cannot quickly enter the stable adjustment, which will lead to a longer time for the idle speed to become stable and affect the driving performance.

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