Auxiliary downgrade controlling method for hybrid electric vehicle

Abstract

The invention relates to an auxiliary downgrade controlling method for a hybrid electric vehicle, which comprises the following steps that: (1) an auxiliary ramp controlling system is arranged and comprises a finished vehicle controller, a motor, a motor controller, an engine, an engine controller, a hydraulic braking device and a hydraulic braking device controller; (2) the finished vehicle controller acquires the position of an accelerator pedal, the position of a braking pedal, the position of a gear shift and the information of vehicle speed in real time to judge whether the vehicle enters a ramp assisting program; and (3) the finished vehicle controller calculates the corresponding brake torque through the variable quantity of the vehicle speed; and according to the battery SOC, the brake moment of the motor, the vehicle speed, the state of a clutch and the gear shift of a speeder, the reverse drawing of the motor and the engine and the brake moment of the hydraulic braking system are uniformly and dynamically coordinated to keep the vehicle speed in relative stability. The method lightens the fatigue degree of the operation of a driver and also improves the driving safety and the fuel economy of the vehicle.

Description

technical field [0001] The invention relates to a driving assistance technology for a vehicle, in particular to a downhill assistance control method for a hybrid vehicle. Background technique [0002] With the increase of car ownership and the improvement of people's requirements for the safety and comfort of car driving, the active safety of cars (assistant driving technology) has become one of the research focuses in the automotive industry. Hybrid vehicle downhill assist technology (that is, when the driver fully releases the brake pedal and accelerator pedal during the downhill process, the vehicle is controlled by the program to keep the vehicle speed relatively stable or no longer increases) because it can reduce the driver's stress. Operational burden, and can realize braking energy feedback, has a good application prospect and application value. There are three kinds of existing downhill assist control methods: 1. After the downhill assist button is selected, the do...

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Problems solved by technology

[0003] However, the shortcomings of the above three downhill assist control methods are: 1. The traditional vehicle control method cannot realize real-time and slope assist control at any speed, and its application range is narrow.

2. The existing downhill assistance control method for hybrid electric vehicles assumes that the braking force of the motor is sufficiently large and the battery SOC (battery state of charge) is sufficiently large, which is inconsistent with the actual working conditions and cannot be popularized and applied

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