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Method to detect faults in boost system of a turbocharged engine
Method to detect faults in boost system of a turbocharged engine
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机译：涡轮增压发动机增压系统故障的检测方法
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摘要
A method of determining a fault in the boost system of a turbocharged or supercharged engine; comprising the steps of a) ascertaining a transient boost period b) determining an actual boost parameter 10 during the transient; c) determining an expected or ideal boost parameter 11 during the transient; and, d) comparing the parameters of steps b) and c) to ascertain if a fault is present. In this way, incorrect boost control can be diagnosed, such as a slow response time. The method may include determining the time taken for the actual boost parameter to reach the value of the ideal boost parameter as steady state, and may also include determining integral values of the actual and expected boost parameters. The expected boost parameter may be determined from a system model, and the actual boost parameter, which may be boost pressure, may be determined from a sensor or system model. The method may include determining a measure of the boost ratio during the transient event and comparing it with a threshold value, and validating any fault determined if it is above said threshold.
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