Engine control strategy and engine control system

Abstract

The invention discloses an engine control strategy and an engine control system. According to the engine control strategy, engine target rotation speed is increased, and an engine obtains compensationtorque when a current engine practical rotation speed change rate is greater than a preset first threshold value and a current engine gas inlet pressure change rate is greater than a preset second threshold value. According to the engine control strategy disclosed by the invention, the engine target rotation speed is increased through the engine control strategy, torque output ability of an engine is improved, compensation torque is provided to the engine, and load, additionally applied to the engine, of the whole vehicle is balanced out, so that clutch combination property of a manual variable-speed vehicle is improved, and a starting process and a gear-shifting process are stable and smooth. Moreover, the engine control strategy increases the engine target rotation speed by distinguishing the engine practical rotation speed change rate and the engine gas inlet pressure change rate and provides an opportunity of compensating the torque to the engine, so that the manual variable-speedvehicle can apply the engine control strategy without the needs of mounting a clutch stroke sensor.

Description

technical field [0001] The invention relates to the field of engine technology, in particular to an engine control strategy and an engine control system for improving the combination performance of a manual transmission. Background technique [0002] For a manual transmission vehicle equipped with a manual transmission, when the vehicle starts and shifts gears, the driver needs to depress the clutch pedal first, disengage the clutch, disengage the engine and the transmission system, and then shift the transmission to the corresponding gear, and then gradually loosen the clutch pedal. Depress the clutch pedal to engage the clutch gradually. [0003] In the process of clutch engagement, the engine load increases, causing the actual engine speed to drop or have a downward trend. In order to prevent the vehicle from stalling when starting or shifting gears, the driver needs to gradually release the clutch and step on the accelerator pedal to increase the fuel supply to the engi...

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Problems solved by technology

[0006] Although the method adopted in the prior art can solve the above-mentioned problems of starting and shifting frustration, the installation and adjustment of the clutch stroke sensor are relatively troublesome, and the relative cost is also high. Therefore, at present, on most manual transmission vehicles, There is still no clutch travel sensor, so the problems of starting and shifting can't be avoided by the methods in the prior art

[0007] In view of this, how to develop an engine control system and a control strategy so that it can improve the clutch engagement performance of a manual transmission vehicle, to avoid the problems of starting and shifting frustration, and to facilitate the promotion and implementation of manual transmission vehicles is an art in the art. Technical problems that technicians need to solve

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