Gearbox control method and system, and vehicle

Abstract

The invention provides a gearbox control method and system, and a vehicle, and belongs to the field of vehicles. The control method comprises the steps of collecting the current rotation direction information of the vehicle and the current gear information of a gearbox, wherein the rotation direction information comprises one or more of rotation direction information of wheels, rotation direction information of a pump wheel and rotation direction information of a turbine; determining the current actual speed ratio of a hydraulic torque converter according to the rotation direction information and the gear information, wherein the actual speed ratio comprises a positive speed ratio and a negative speed ratio; determining a torque amplification coefficient corresponding to the actual speed ratio according to the actual speed ratio; calculating a target output torque upper limit value of an engine according to a torque amplification coefficient and a current input torque upper limit value of the gearbox; and controlling the output torque of the engine not to exceed the upper limit value of the target output torque. According to the control method, the control system and the vehicle, the hardware durability of the gearbox under all working conditions can be ensured.

Description

technical field [0001] The invention belongs to the field of vehicles, and in particular relates to a control method, a control system and a vehicle of a gearbox. Background technique [0002] In the car power system, the gearbox is responsible for transmitting power. In an automatic transmission system with a torque converter, the output shaft of the engine is connected to the input shaft of the transmission through the torque converter. The gearbox is designed with a maximum input torque for each gear. The maximum torque is determined by the gearbox hardware and is used to ensure that the gearbox input torque meets the design state and protect the gearbox hardware from being damaged due to excessive torque. This torque is called the maximum gearbox input torque. The output shaft of the engine is connected to the pump wheel of the torque converter, and the turbine of the torque converter is connected to the input shaft of the gearbox. In the initial stage, the turbine sp...

AI Technical Summary

Problems solved by technology

Because the gearbox turbine speed sensor cannot identify the direction, and the gearbox torque limit strategy does not consider the torque increase characteristics at this time, the actual gearbox torque limit is only limited by the torque increase characteristics of the absolute value of the current speed ratio.

As a result, the turbo torque after the actual engine torque amplification is far beyond the maximum turbo torque that the gearbox can withstand. From the perspective of the gearbox, there is a risk of hardware damage in this particular case

Images