Control method for protecting air compressor of finished vehicle

Abstract

The invention discloses a control method for protecting an air compressor of a finished vehicle. The method specifically comprises the steps of presetting the characteristic curve Air-MAP of the air compressor in an electronic control unit (ECU) in advance, wherein the characteristic curve Air-MAP of the air compressor contains the air compressor efficiency value Eta demarcated according to the pressure ratio Pi and the fresh air inflow m; acquiring the outlet pressure of the air compressor, fresh air inflow and ambient pressure by means of the ECU, and searching for the characteristic curve Air-MAP of the air compressor according to the ratio of the outlet pressure of the air compressor to the ambient pressure and the fresh air inflow to obtain the outlet temperature of the air compressor under the current working condition; sending out a control signal for regulating the fuel injection quantity of an engine under the condition that the outlet temperature of the air compressor is beyond the preset temperature range of the air compressor. By means of the control method, the outlet temperature of the air compressor can be controlled effectively in real time, and then damage of the air compressor caused by overheating can be totally avoided and detection of the efficiency of an intercooler is facilitated.

Description

technical field [0001] The invention relates to the technical field of electronically controlled engines, in particular to a control method for protecting a complete vehicle compressor. Background technique [0002] As a modern means of transportation, automobiles (cars, passenger cars, and trucks, etc.) play an important role in our daily life and industrial production. With the gradual spread and deepening of the energy crisis all over the world, the price of fuel oil continues to rise, which has recently caused the running costs of automobiles to continue to increase. For this reason, how to reasonably improve the economy of automobile engines, reduce fuel consumption and reduce environmental pollution has become the focus of people's attention. [0003] In the prior art, a supercharged engine is one of means to improve the economic performance of an automobile engine. Specifically, a supercharged engine includes components such as a booster air compressor and an interc...

AI Technical Summary

Problems solved by technology

[0004] Among them, the gas temperature at the outlet of the compressor is one of the important parameters affecting the operation of the compressor. For the compressor, when the outlet temperature of the compressor exceeds the temperature limit of the compressor impeller, the supercharger in the compressor will fail, which will eventually lead to engine performance. problems such as falling or even paralysis

[0005] At present, the outlet temperature of the compressor is generally obtained by installing a sensor on the outlet pipeline of the compressor. However, for the whole vehicle, the compressor outlet pipeline has relatively high sealing requirements, and installing a sensor at this position is likely to cause pipeline leakage. Once the pipeline leaks, it will seriously affect the working performance of the engine

[0006] Therefore, existing technicians generally roughly estimate the outlet pipeline temperature of the compressor through practical experience. This method has poor accuracy and is not conducive to the operator's control of the working status of the engine system.

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