Control method and system for transfer case power takeoff of automobile engine

Abstract

The invention discloses a control method and system for a transfer case power takeoff of an automobile engine. The control method comprises the following steps that S1, the power takeoff is started; s2, after the vehicle body controller receives the power takeoff starting signal, whether the power takeoff closing condition is met or not is judged; s3, when the transmission electric control unit receives the power takeoff starting signal and the power takeoff working state signal, the gear is locked to the D gear, the transmission electric control unit locks the transmission gear to the direct gear, and a constant rotating speed signal is sent to the engine electric control unit; and S4, after the engine electronic control unit receives the accelerator conversion signal and the constant rotating speed signal, the engine operates at the calibrated rotating speed constantly, and the signals are transmitted to an output shaft of the transfer case through the transmission system.

Description

Technical field [0001] The present invention relates to the technical field of automotive equipment, specifically to a control method and system of a transfer case power take-off of an automobile engine. Background [0002] In the past, heavy-duty off-road vehicles were equipped with mechanical manual transmissions, when the power of the output shaft of the transfer box requires constant speed, the transmission gear is manually operated by the shift lever to the gear with a speed ratio of 1, the gear will not run, at this time, the engine will be controlled at a constant speed, which can achieve the requirements of the constant speed of the output shaft of the transfer box. However, with the development of technology, heavy-duty off-road vehicles equipped with automatic transmission more and more situations, when the transfer box output shaft power takes the constant speed, at this time through the gear shift handle can not lock the transmission gear in the gear ratio of 1 gear, ...

AI Technical Summary

Problems solved by technology

However, with the development of technology, more and more heavy-duty off-road vehicles are equipped with automatic transmissions. When the output shaft of the transfer case requires a constant rotational speed, the gear position of the transmission cannot be locked at a speed ratio of 1 through the shift handle. The gear position jumps with the change of engine speed and load. Therefore, when the engine is controlled at a certain constant speed, it cannot reach the constant speed requirement of the output shaft of the transfer case, and it does not meet the trial work of some equipment. condition