Control system and method for ACC Stop smooth parking

Abstract

The invention discloses a control system and method for ACC Stop smooth parking. A gateway receives a network signal, and judges whether the ACC function is activated or not; the gateway judges the received torque request of the ACC and the received brake request of the ACC, determines a brake request and a torque-free request of ACC work and judges the received brake type signal sent by the ESC,and after it is determined that the ESC responds to the deceleration request of the ACC for the ESC and the gateway judges that the vehicle speed is less than a set value, the gateway outputs a pressure value obtained after calculation of a wheel cylinder pressure signal to the TCU as a brake pressure signal, and the TCU conducts vehicle brake state recognition and clutch self-adaptive control. According to the invention, the original TCU only receives the pressure signal of the brake main cylinder to carry out brake decision-making, the overall state of the vehicle is identified through the gateway; the brake main cylinder and wheel cylinder pressure signals sent by the ESC are integrated, and then the integrated brake pressure signals replace the brake main cylinder pressure signals to be transmitted to the TCU, so that the TCU can recognize the brake state of the whole vehicle under all working conditions, the EMS torque is better controlled, and ACC Stop smooth parking is achievedthrough linkage with the ESC.

Description

technical field [0001] The invention belongs to vehicle braking control technology, in particular to a control method for braking and parking with adaptive cruise with automatic follow-up function (ACCStop). Background technique [0002] Adaptive cruise control with automatic follow-up function (ACC Stop) is simply to automatically identify the vehicle in front, and simultaneously realize the function of automatic follow-up and parking. In the process of ACC following and stopping at low speed, the joint control of ESC braking deceleration and EMS torque response is carried out to realize automatic following and stopping. The smoothness during the follow-up process is an important subjective evaluation index of ACC Stop, and it is also the focus of the joint adjustment and calibration of the ACC Stop function and ESC, EMS, and TCU. [0003] At present, for vehicles without ACC Stop function, the TCU recognizes the braking state. Usually, the TCU judges whether the vehicle i...

AI Technical Summary

Problems solved by technology

The hardware structure and software logic of this type of vehicle have been solidified, and the ACC Stop function cannot be realized.

If the above-mentioned vehicle is configured with the ACC Stop function, when the vehicle brakes at low speed, the ESC will actively brake through the wheel cylinders. At this time, the oil pressure signal of the master cylinder is 0bar, and the TCU cannot recognize and judge that the vehicle is braking, but it will be wrong. It is thought that the vehicle climbs a slope and judges that it is necessary to request the EMS to increase the engine torque, and the vehicle will jump at this time

In order to solve the above problems, the control strategy needs to be modified, which means that the network signal architecture, gateway, TCU, etc. need to be re-adapted and developed, which is time-consuming and labor-intensive

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