Diagnosis method and system of natural gas engine supercharger control system

Abstract

The invention provides a diagnosis method of a natural gas engine supercharger control system. The method is used for diagnosing an air source pipeline, a pressure reducer and a supercharger control valve of the control system, and comprises the following steps that working conditions of an engine are judged; when the engine is located in preset working conditions not influencing normal operationof the engine, the following diagnosis operations are carried out: a duty ratio of the supercharger control valve is set as 0; the air source pipeline and the pressure reducer are diagnosed based on the air source pressure provided to the supercharger control valve and acquired outlet pressure discharged by the supercharger control valve; and under the condition of determining no fault of the airsource pipeline and the pressure reducer, the duty ratio of the supercharger control valve is adjusted, and the circulating characteristics of the supercharger control valve are diagnosed based on theoutlet pressure of the supercharger controller after each adjustment. The invention further provides a diagnosis system of the natural gas engine supercharger control system. The faults of related parts can be timely removed to achieve after-sales maintenance.

Description

technical field [0001] The invention belongs to the field of engine control systems, and in particular relates to a diagnosis method and system for a natural gas engine supercharger control system. Background technique [0002] Now commercial vehicle engines are generally equipped with superchargers, and the reliability of supercharger related components has reached a very high level. When the traditional non-controlled supercharger is changed to a supercharger with controllable boost pressure A three-way solenoid valve needs to be connected in front of the supercharger bypass control diaphragm valve. The inlet air source of the three-way battery valve is pressurized air or an external stabilized air source, and the outlet of the three-way solenoid valve is connected to the supercharger. Bypass control diaphragm valve. [0003] Existing supercharger control diagnostic algorithms often only diagnose the supercharged pressure, and can only locate whether the supercharged pres...

AI Technical Summary

Problems solved by technology

[0003] Existing supercharger control diagnostic algorithms often only diagnose the supercharged pressure, and can only locate whether the supercharged pressure is too high or insufficient, but cannot further locate the problem. The supercharger is an energy conversion component. When the supercharged pressure When it is too high or insufficient, it may also be related to engine combustion, making it difficult to troubleshoot boost pressure faults

For the control method of supercharger control with an external stabilized air source, there are many components on the supercharger control pipeline, and there are high / low air pipes between the vehicle high-pressure gas cylinder and the supercharger bypass control diaphragm valve. , high-pressure air pressure reducer, supercharger control valve, problems with these three components may also lead to excessive or insufficient boost pressure, especially for commercial vehicle natural gas engines, the ignition system has many problems and is unreliable The ignition directly leads to abnormal combustion, which in turn leads to abnormal boost pressure

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