Engine torque control method capable of improving the start performance of whole vehicle

Abstract

The invention discloses an engine torque control method capable of improving the start performance of a whole vehicle, and belongs to the field of control technology. The technical proposal is that the method can detect high position clutch switching signal, the low position clutch switching signal, the neutral position signal and the vehicle speed signal of a vehicle in real time; only when the clutch is detected to be between a totally disengaged state and a half clutch state, the gear of a gear box is not in a neutral position, and the vehicle speed is less than a preset threshold value, the vehicle is judged to be in a starting working condition; at the moment, the output torque value of an idle speed controller is enlarged by raising the idle speed of an engine through idle speed compensation, then the output torque of the engine is enlarged, and the smooth start of the vehicle is realized. The method can accurately determine the starting working condition of the vehicle according to the high position clutch switching signal and the low position clutch switching signal, effectively avoids misjudgment of the starting intention of a driver, improves the start performance of the vehicle, eliminates accident potentials caused by sudden movements of the vehicle, and improves the driving safety of the vehicle.

Description

Technical field [0001] The present invention involves a method to control the output torque of the engine, which can solve the problem of the start of the dual -quality flywheel. It is the field of control technology. Background technique [0002] The dual -quality flywheel has a certain buffering effect on the torque of the engine output to the transmission, so it can improve the driving comfort of the vehicle. [0003] Existing technology generally judge the starting conditions based on the engine speed signal, the file signal, the speed signal, the throttle pedal opening signal and the brake signal, and use the engine cooling liquid water temperature signal to calculate the offset of idling target.The engine speed and idling target value performed PID calculation to output torque.By increasing the difference between the engine speed and idling target value (that is, the idling target value at the start of the start) can increase the output torque of the PID and achieve the smo...

AI Technical Summary

Problems solved by technology

The disadvantage of this engine torque control method is that it cannot accurately judge the starting conditions. When the vehicle speed signal, in-gear signal, brake pedal signal and accelerator pedal signal all meet the starting requirements, the driver depresses the clutch and then releases it. But when there is no intention to start, the engine speed will also increase, causing the vehicle to rush forward, which is very likely to cause traffic accidents

In addition, the existing technology only considers the water temperature signal when calculating the offset of the idle speed target value, but does not consider the influence of atmospheric pressure on the starting performance. It is small, and it is easy to stall due to insufficient output torque when starting

At the same time, the existing technology does not consider the difference between the reverse gear and the forward gear, and in the actual driving process, the driver's field of vision is relatively narrow when reversing, and using the same idle speed offset as the forward gear will easily lead to safety accidents

Images