Semi-active cruise control system and method

Abstract

The invention provides a semi-active cruise control system and method. The semi-active cruise control system comprises a signal input unit, a whole vehicle controller and a control feedback unit. The signal input unit is connected with the whole vehicle controller. The whole vehicle controller is connected with the control feedback unit. The signal input unit comprises a cruise switch, a key, a gear shifter, a braking pedal, an anti-lock braking system, a battery management system, a vehicle fault detecting module and an accelerator pedal. The current vehicle state can be judged by the whole vehicle controller on the basis of collected operation signals input by a driver to the signal input unit. The control feedback unit comprises a motor controller and a driving motor. The whole vehicle controller drives the driving motor to output corresponding control torque through the motor controller, so that the vehicle can be maintained to move at constant speed all the time. Cruising is carried out by the vehicle at stable speed under different conditions, so that the phenomenon that the driver frequently operates the two pedals is avoided.

Description

technical field [0001] The invention relates to the field of cruise control of new energy vehicles, in particular to a semi-active cruise control system and method thereof. Background technique [0002] With the development of the automobile industry, some shortcomings of the vehicle itself still exist. For example, when the vehicle is going down a long slope, the speed of the vehicle is generally controlled by the braking system, but this causes a large amount of energy to be dissipated as heat, which reduces the economy of the vehicle; at the same time Braking for a long time will easily cause the braking system to fail, affecting the safety of the vehicle, and depressing the brakes for a long time will easily cause driving fatigue and affect driving comfort. Another example is that when the vehicle is in hilly conditions, the driver needs to frequently switch the accelerator and brake pedals, which affects the driving comfort to a certain extent. [0003] Aiming at the s...

AI Technical Summary

Problems solved by technology

[0002] With the development of the automobile industry, some shortcomings of the vehicle itself still exist. For example, when the vehicle is going down a long slope, the speed of the vehicle is generally controlled by the braking system, but this causes a large amount of energy to be dissipated as heat, which reduces the economy of the vehicle; at the same time Braking for a long time will easily cause the braking system to fail, which will affect the safety of the vehicle, and if you step on the brake for a long time, it will easily cause driving fatigue and affect driving comfort.

Another example is that when the vehicle is in hilly conditions, the driver needs to frequently switch the accelerator and brake pedals, which affects the driving comfort to a certain extent.

[0003] Aiming at the shortcomings of the vehicle itself, auxiliary functions including cruise control and adaptive cruise have been applied to different degrees in the car. Among them, cruise control can relieve driving fatigue well, but it is generally only used for relatively gentle, closed On the road with limited application conditions, the speed of the constant speed cruise will be higher than the set speed in the downhill condition of a relatively large slope, and it cannot save fuel in the long downhill condition; in the condition of uncertain road conditions Under the current situation, frequent setting and release of cruise control is not conducive to operation and driving safety; the current adaptive cruise system is mostly used in traditional high-end models, and it is rarely used in the field of new energy vehicles. When it is detected that the distance between the vehicle and the vehicle in front is too small, the wheels are properly braked by coordinating with the brake anti-lock braking system and the engine control system to achieve the purpose of automatic deceleration. The energy is directly lost in the form of heat, which affects the economy of the vehicle to a certain extent

In addition, the high application cost of adaptive cruise control hinders its further widespread application

Moreover, the radar is prone to blind spots or misjudgments in the detection of mountainous roads with complex working conditions, which directly affects the safety performance of the vehicle.

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