Vacuum degree control method and system suitable for hybrid power braking

Abstract

The invention relates to a vacuum degree control method and system suitable for hybrid power braking. The vacuum degree control system suitable for hybrid power braking includes an engine control unit, a storage battery, a braking vacuum degree sensor, an atmospheric pressure sensor, an engine, an electric vacuum pump, a whole vehicle control unit, an electric vacuum pump relay and a vacuum booster; the method comprises the four steps that the engine control unit controls the electric vacuum pump to work according to a current braking vacuum degree; the electric vacuum pump is protected duringworking; the whole vehicle control unit runs according to logic; variables are set through the engine control unit. Compared with the prior art, the vacuum degree control method and system suitable for hybrid power braking have the advantages that the electric vacuum pump does not need to work consistently, the safety can be ensured, the energy consumption is reduced, the service life is prolonged, and the normal work of the electric vacuum pump of a whole vehicle in a life cycle is ensured; with complete and effective vacuum system fault judgment logic, it is ensured that any failure possibility of the vacuum system can be detected.

Description

technical field [0001] The invention belongs to the technical field of engine electronic control systems, and relates to a vacuum degree control method and system suitable for hybrid braking. Background technique [0002] In the existing technology before the present invention, which is suitable for the vacuum degree control of hybrid braking, domestic OEMs use the negative pressure of the intake manifold as the vacuum for the braking vacuum degree technology of traditional vehicles matching natural intake engines. source, no need to control; for traditional vehicles matching supercharged engines, the electric vacuum pump is additionally controlled according to demand, and the intake manifold negative pressure or vacuum pump is used as the vacuum source; for electric vehicles, only the electric vacuum pump is controlled to work as the vacuum source to meet the requirements of vacuum degree . Patent Document 1 (CN201020277630.0) proposes a vacuum boosting safety control syst...

AI Technical Summary

Problems solved by technology

For the systems disclosed in Patent Document 1 and Patent Document 2, the control system is controlled by the HCU, and the signal interaction is more complicated; for the system disclosed in Patent Document 3, the system requires an additional control unit with higher cost; In addition, for the systems disclosed in Patent Document 1 and Patent Document 2, the control systems and methods described only introduce the control under the normal working mode of the vacuum pump, and do not propose detailed protection measures for the vacuum pump body and how to deal with complex failure modes

[0003] At present, the domestic market has no complete specific reports on the application of vacuum degree control for hybrid vehicles with supercharged direct injection engines.

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