Control method for improving brake performance

A control method and performance technology, applied in the direction of engine control, brakes, vehicle components, etc., can solve problems affecting user experience, etc., and achieve the effect of increasing hardware cost, realizing braking performance, and improving vacuum degree

Active Publication Date: 2012-12-26
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because this method turns off electrical loads such as air conditioners against the driver's will, affecting user experience

Method used

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  • Control method for improving brake performance
  • Control method for improving brake performance
  • Control method for improving brake performance

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Embodiment Construction

[0017] Based on the calculation of the vacuum degree of the vacuum booster and the active control of the electronic throttle, the invention designs a set of control methods to improve the braking performance. A control method for improving braking performance. The method comprises the following steps: establishing a vacuum degree model of the vacuum booster based on the intake pressure and the ambient pressure to calculate the vacuum degree of the vacuum booster. During the braking process, when the system judges that the vacuum degree of the vacuum booster drops to a certain threshold, the braking effect becomes worse. Taking the vacuum degree of the booster as the control target, the system actively closes the throttle opening to increase the vacuum degree of the intake manifold, and then increases the vacuum degree of the booster to achieve the purpose of improving the braking performance. When the vacuum degree is greater than a certain threshold, the active control of th...

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Abstract

The invention discloses a control method for improving the brake performance, which comprises the following steps of: a step 1 of judging whether to meet the following conditions that a brake signal exists, the rotating speed of an engine is higher than the lowest operation rotating speed and fuel is cut off after braking is carried out; a step 2 of judging whether the vacuum degree of a vacuum booster is reduced to a certain threshold value if the conditions are met, and if yes, actively reducing the opening of a throttle valve by a system to improve the vacuum degree of an intake manifold so as to improve the vacuum degree of the booster; and a step 3 of continuously judging the current vacuum degree state of the brake booster and stopping the active control of the electronic throttle valve to improve the vacuum degree until the vacuum degree is improved to a threshold value. According to the invention, the vacuum degree of the vacuum booster can be improved, the promotion of the brake performance is implemented, other functions are also not influenced and the hardware cost is not increased.

Description

technical field [0001] The invention relates to an automobile engine management system (EMS) with an electronic throttle, especially a vehicle equipped with an engine with a small displacement (below 1.6L displacement). The braking system uses the vacuum boost of the engine intake manifold. Background technique [0002] Due to the increasingly stringent national fuel consumption regulations and the consideration of energy conservation and environmental protection, the development of small-displacement vehicles has become an important development direction for major OEMs. Small-displacement cars generally have low cost, and rarely use an independent electronic vacuum pump as a brake booster source, but use the throttling effect of the engine intake manifold to generate a pressure difference (vacuum) between the engine intake manifold and the ambient pressure as a brake booster source. During engine operation, the intake manifold draws vacuum to the two chambers of the brake ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/52F02D9/10
Inventor 倪春生于世涛李君
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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