Torque monitoring method and device for hybrid electric vehicle

Abstract

The invention provides a torque monitoring method and device for a hybrid electric vehicle, and belongs to the technical field of electronic control of a powertrain of the hybrid electric vehicle. The method comprises the following steps of: (a) calculating to obtain a maximum / minimum steady state torque limit value based on torque related driver operation information and state information; (b) comparing an actual torque value acting on a wheel end with the maximum / minimum steady state torque limit value, if the actual torque value exceeds the maximum steady state torque limit value or the minimum steady state torque limit value, calculating and outputting the corresponding overrun torque; (c) calculating the corresponding overrun acceleration based on the overrun torque, and carrying out integral calculation on the overrun acceleration to obtain the corresponding overrun speed and overrun displacement; and (d) determining whether the overrun speed and / or overrun displacement exceeds the corresponding predetermined safe threshold value or not so as to determine whether the current actual torque value is in a safe state or not. According to the torque monitoring method, the safety of the hybrid electric vehicle can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electronic control of a power system of a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), and relates to a control process of vehicle torque, in particular to a torque monitoring method and device for a hybrid electric vehicle. Background technique [0002] Modern cars increasingly rely on electronic control methods, so-called X-By-Wire. Among them, the electronically controlled power system refers to the control of the vehicle power system by means of electronic control, which is a commonly used vehicle power system solution at present. In the electronically controlled power system, the driver's torque-related intentions (acceleration, braking, gear operation, etc.) can be collected and analyzed electronically, and further converted into wheel-end torque that drives the vehicle. This process is simply called the vehicle torque. The torque control process is calculated and controlled in the elect...

AI Technical Summary

Problems solved by technology

[0007] However, when the existing software monitoring methods are applied to the torque control process of hybrid electric vehicles with multiple power sources and multiple modes, there are obvious shortcomings of redundant algorithms and excessive design complexity, which will easily lead to the safety of hybrid electric vehicles. decreased sex

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