Vacuum booster security control system and control method of strong hybrid electric vehicle

Abstract

The invention provides a vacuum booster security control system and a control method of strong hybrid electric vehicle. The system comprises a hybrid vehicle control unit (HCU), an electric vacuum pump, a vacuum energy storage cavity, a pressure sensor, a relay and a wiring harness; the voltage value is judged through inputting the voltage signal of the pressure sensor to a main controller, thereby judging whether the vacuum degree reaches up to standard, if the vacuum degree is not within a calibration range, the main controllers sends out a digital low-level signal to close the relay, and the electric vacuum pump is connected with the power supply of the vacuum pump; after the vacuum pump works for a period of time, if the voltage signal detected by the sensor is within the calibration range, the vacuum degree of the vacuum energy storage cavity is indicated to meet requirements, and at the moment, the main controller controls the relay to be disconnected to stop the vacuum pump from working. The invention can effectively utilize vacuum assistance to complete braking demands, when fault occurs, the vacuum assistance braking fails, and the control system can detect voluntarily toalarm faults accurately and timely, thus significantly improving braking safety.

Description

technical field [0001] The invention relates to a brake boosting control technology for automobiles, in particular to a vacuum boosting closed-loop control and a safety protection method. Background technique [0002] As a common safety system for new energy vehicles, the vacuum booster braking system can ensure the comfort of the brake pedal and safe braking when the driver needs to brake, and it also needs to meet the requirements of regulations. [0003] The main sources of vacuum used in vacuum boosting are as follows: negative pressure in the intake manifold of the engine, provided by an electric vacuum pump, and jointly provided by the engine and the vacuum pump. In conventional vehicles, it is mostly generated by the engine itself; in some new energy vehicles, it is generated jointly by the engine and electric vacuum pump or by an independent electric vacuum pump. There are two main problems in the control method of conventional new energy vehicle vacuum boosting: fi...

AI Technical Summary

Problems solved by technology

There are two main problems in the vacuum boosting control method of conventional new energy vehicles: first, when the vehicle is under special starting and braking requirements, it cannot have enough boosting power; second, when the vacuum boosting system fails or the vacuum cavity In the event of leakage, not only cannot complete the brake boosting, but also bring hidden dangers to brake safety

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