A Feedforward PID-based Automatic Transmission Idling Neutral Control Method

Abstract

The invention discloses an idle neutral control method of an automatic transmission based on feedforward PID. The fuel consumption rate of an automobile equipped with a hydromechanical automatic transmission can be effectively reduced, meanwhile, gear shifting impact in the gear shifting process can be reduced, and the comfort of the whole automobile can be improved. The control method comprises the following steps that a brake pedal position sensor, an accelerator opening sensor, a vehicle speed sensor and a transmission gear sensor always detect the running state of the automobile, after a TCU judges the state, a low-gear clutch is separated by changing the pressure of an electromagnetic valve, and meanwhile, and the control of an engine and the transmission is coordinated to complete the change from the driving gear to the neutral gear. When the TCU detects the intention of a driver to start the automobile again, the pressure of the electromagnetic valve is changed so that the low-gear clutch is gradually engaged, the change from the neutral gear to the driving gear is completed, and the whole control process is completed. The control method is applicable to the automobile equipped with the hydromechanical automatic transmission, the control of an engine idle speed system and the transmission is coordinated in a power cut-off process, and the comfort and fuel economy are good.

Description

technical field [0001] The invention relates to the field of automobile transmission, in particular to a feedforward PID-based idle-speed neutral control method of an automatic transmission. Background technique [0002] With the improvement of people's living standards and the acceleration of urbanization, people are increasingly relying on cars to travel, which leads to more and more congestion on urban roads. People pay more and more attention to the comfort and economy of cars when purchasing vehicles. Vehicles equipped with hydromechanical automatic transmissions can reduce driver fatigue caused by frequent gear changes at red lights or in traffic jams. Moreover, the hydromechanical automatic transmission has good starting performance and applicability to the road, and is deeply loved by many drivers. [0003] In a car equipped with a hydromechanical automatic transmission, since there is no dry clutch between the engine and the transmission, there is always power tra...

AI Technical Summary

Problems solved by technology

[0004] At present, some companies have proposed a neutral control method to realize the change process of the car from driving gear to neutral gear during the parking waiting process, but the low-gear clutch is completely disengaged during this process, resulting in large fluctuations in the turbine speed during the re-engagement of the low-gear clutch, and the vehicle is comfortable. Poor sex

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