A Judgment Method of Torque Value at Input Terminal of Automatic Transmission

Abstract

The invention discloses a method for judging the torque value at the input end of an automatic gearbox, which is calculated and judged by an automatic gearbox controller, and the automatic gearbox controller and the engine controller are respectively connected to the CAN bus, including judging the speed signal of the output shaft 1. Effective judgment of the message state, judgment of the throttle opening signal, judgment of the engine output torque signal, and determination of the torque at the output end of the automatic transmission. To determine whether to use the default torque limit value or to replace the engine invalid torque value with the torque chart output torque value set in the automatic transmission controller, through the above method to ensure the safety of gear shifting and vehicle driving.

Description

technical field [0001] The invention relates to the technical field of automatic transmission control, in particular to a method for judging the torque value at the input end of an automatic transmission. Background technique [0002] Torque plays a vital role in the entire shifting strategy of the automatic transmission. Normally, the TCU (automatic transmission controller) receives the engine controller's engine output from the engine controller through the CAN (Controller Area network) bus. The output torque signal is the torque signal at the input end of the gearbox, and then the TCU software internally calculates to obtain the net torque acting on the automatic gearbox for shift strategy control. However, in some cases, the engine output torque signal value is invalid due to a fault on the engine side, the engine controller will replace the actual invalid output torque signal value with a default torque value, when the TCU receives the default invalid torque value valu...

AI Technical Summary

Problems solved by technology

However, in some cases, the engine output torque signal value is invalid due to a fault on the engine side, the engine controller will replace the actual invalid output torque signal value with a default torque value, when the TCU receives the default invalid torque value value, it will be confirmed that the current engine output torque signal value is unreliable, and certain protection measures will be taken inside the TCU software to ensure the quality of dynamic shifting and the driving safety of the vehicle. In the above cases, the control strategy of the automatic transmission is difficult to It is obtained from the actual operation of the automatic transmission, so the shift strategy is prone to errors, resulting in a reduction in the safety of vehicle driving

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