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Hybrid electric vehicle speed estimating method

A hybrid electric vehicle and vehicle speed technology, which is applied in the field of vehicle speed estimation, can solve problems such as inaccurate wheel slip estimation, and achieve the effect of reducing dependence

Active Publication Date: 2014-01-22
上海诺昂汽车技术有限公司
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the application limitations of the existing vehicle speed estimation algorithm due to the use of acceleration sensors and the problem of inaccurate estimation caused by wheel slippage when ABS, ESP, and TCS function, and to provide a vehicle speed estimation algorithm specifically for hybrid vehicles. Speed ​​Estimation Algorithm

Method used

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Embodiment Construction

[0057] The present invention is described in detail below in conjunction with accompanying drawing:

[0058] In the present invention, firstly, the hybrid electric vehicle control unit HCU (Hybrid electric vehicle control unit) reads the rotational speed of each wheel and the error state of the rotational speed signal of each wheel from the ABS controller, reads Get the drive motor speed and drive motor speed signal error status, read the engine speed and engine speed signal error status from the engine controller ECU (Engine control unit), read their respective working status from the respective controllers of TCS, ABS and ESP . Then, the HCU selects different vehicle speed estimation algorithms to estimate the vehicle speed according to the wheel speed error state, the driving motor speed error state, the engine speed error state, and the working state of TCS, ABS, and ESP.

[0059] Under different circumstances, based on the rotational speed signals of the above-mentioned ...

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Abstract

The invention discloses a hybrid electric vehicle speed estimating method which solves the problem in the existing vehicle speed estimating method that application limitation is caused by an acceleration sensor and estimation is incorrect due to wheel slipping when an anti-brake system (ABS), an electronic stability program (ESP) and a traction control system (TCS) work. The hybrid electric vehicle speed estimating method includes the following steps of 1 signal reading which includes reading wheel signals of a left front wheel, a right front wheel, a left rear wheel and a right rear wheel of a hybrid electric vehicle; 2 converting of the wheel signals into corresponding vehicle speed signals; 3 vehicle speed estimating algorithm selection which includes determining a vehicle speed estimating algorithm according to four wheel speed error state variables, a motor rotation speed error state variable, a TCS work state variable, an ABS work state variable and an ESP work state variable; 4 giving of the vehicle speed as zero when four wheel speed is detected abnormal and rotation speed signals of a driving motor or an engine are abnormal; 5 calculating of vehicle speed output.

Description

technical field [0001] The present invention relates to a vehicle speed estimation method, more precisely, the present invention relates to a hybrid vehicle speed estimation method. Background technique [0002] In recent years, hybrid electric vehicles have attracted widespread attention in the automotive industry due to their excellent energy-saving and environmental protection effects. [0003] Hybrid electric vehicles adjust the energy distribution ratio between the engine and the motor through the control strategy, so that the engine can work in the optimal area as much as possible, so as to achieve the purpose of energy saving and environmental protection. Vehicle speed is an important input in the control strategy of hybrid electric vehicles. It is not only related to the switching conditions between various working modes of hybrid electric vehicles, but also has a direct relationship with the distribution of power source torque / power in each mode. Therefore, the acc...

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Application Information

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IPC IPC(8): B60W40/105
CPCB60W40/105B60W2510/0638B60W2510/081B60W2520/28B60W2720/10
Inventor 曾小华彭宇君李胜白鸽宋大凤刘彬娜杨南南贺辉巴特张昶
Owner 上海诺昂汽车技术有限公司
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