Control method and device for automobile and its engine

Abstract

The invention discloses a vehicle, and a method and a device for controlling an engine thereof. The control method comprises the following steps: acquiring wheel speed of a vehicle in real time duringan acceleration process of the vehicle; calculating initial target speed of an engine of the vehicle according to the wheel speed of the vehicle; correcting the initial target speed to obtain a theoretical target speed; obtaining actual engine speed, and obtaining a difference value between the actual engine speed and theoretical target speed; and controlling an absolute value of the difference value between the actual engine speed and the theoretical target speed to be smaller than a set difference value. Thus, impact sway caused by oil supply during a running process of the vehicle can be preferably improved.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an engine control method, an engine control device and an automobile. Background technique [0002] Generally, when driving a car, there will be a calculation of greatly reducing the ignition angle after stepping on the accelerator, in order to reduce the first impact of the speed. Further, there is a small spark-angle adjustment for revs to and fro after the first shock of anticipated depression. The above two ignition angle adjustments, the first one is to reduce the first impact, and the second one is to reduce the back and forth shock. The two adjustments work together to achieve the purpose of reducing the oil shock shock. However, this adjustment has the following disadvantages: [0003] 1) Timing of adjustment: At present, the adjustment basis of the ignition angle is mainly based on the rate of change of the throttle. When the rate of change of the throttle exceeds a certain ...

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Problems solved by technology

However, it is difficult to calibrate the limit value of the throttle change. Power will be lost if it is too early, and the impact will not be suppressed if it is too late. Moreover, the speed change under the same throttle may be different. the timing is wrong;

[0004] 2) Adjustment range: In the adjustment process of the above technology, the large adjustment is mainly judged based on the throttle depth and gear position. Under the same working conditions (throttle and gear position), the size of the speed upstroke may also be different. Therefore, the adjustment range is also difficult to meet the requirements. If it is too large, it will lose power, and if it is too small, it will not be able to suppress the impact.

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