Intelligent parking braking and auxiliary starting control method

Abstract

The invention discloses an intelligent parking braking and auxiliary starting control method, which includes steps of firstly, initializing an intelligent parking braking controller and reading control parameters stored in a single-chip microcomputer, secondly, reading a vehicular speed signal V, a brake pedal travelling signal Db, an accelerator pedal travelling signal Da, a transmission gear signal Js, an ignition key door switch signal Key, an enable switch signal Button, a front wheel speed signal wf, a rear wheel speed signal wr and a gradient signal Sa, thirdly, invoking and performing an intelligent parking control procedure, an auxiliary starting control procedure, a parking brake automatic retracting control procedure, a long-term parking control procedure, an emergency braking control procedure or manual reset cutting-off control procedure according to the read signals and fulfilled response conditions, fourthly, converting the target torque of a motor according to the motor target braking force calculated from the control procedures, fifthly, calculating the target rotor current of the motor according to the obtained target torque of the motor, and sixthly, controlling the duty ratio of a motor PWM (pulse width modulation) driving control circuit according to the target rotor current of the motor.

Description

technical field [0001] The invention relates to an intelligent parking brake and auxiliary starting control method applicable to both manual and automatic transmission vehicles. Background technique [0002] With the development of automobile technology, people have higher and higher requirements for the comfort, safety, intelligence and humanization of automobiles. For the mechanical manpower parking brake system that is generally used at present, it is also developing towards the direction of electronic control. The service brake system developed by Bosch has the function of Hill Hold Control (HHC). For the manual transmission vehicle equipped with this system, when starting on a slope, it is not necessary to cooperate with the accelerator pedal, clutch pedal and parking handle (or brake pedal) to complete the slope start; for the automatic transmission vehicle equipped with this system, when starting on a steep slope, There is also no need to complete the ramp start thr...

AI Technical Summary

Problems solved by technology

[0003] Although the EPB system can realize functions such as automatic parking, auxiliary starting on slopes, emergency braking, and active braking, most EPB systems use the parking braking force implemented by the electromechanical brake, and the EPB button has no mechanical function. Connect the wheel cylinder, just an electronic switch

The assembly of electromechanical brakes will bring about a significant increase in cost, and some cars are equipped with such electromechanical brakes on all four wheels, which has caused most of the EPB to appear on the equipment list of luxury cars

Moreover, the electromechanical brake is arranged on the brake caliper body, the working environment is harsh, its reliability is affected, and the reliability of the electronic control system cannot be guaranteed when it fails.

In addition, the current EPB system requires the driver to press the EPB button to trigger the electric parking brake function. Although the physical burden is reduced, it is still a bit cumbersome, and the braking force does not change with the slope and the vehicle quality. adjust

Always apply the parking brake force under full load and suddenly release the brake force when starting, the car will run forward and may cause the engine to stall, reducing the starting time and driver comfort

Therefore, intelligent parking is not realized

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