Apparatus for determining engine abnormality
First Claim
1. An engine system capable of diagnosing an occurrence of malfunction in engine operation represented as a plurality of controlled variables associated with the engine operation, the engine system comprising:
- condition detecting means for detecting an operational condition of the engine and for outputting a signal indicative of the detection result;
first regulating means for regulating a first controlled variable;
first control means for computing a parameter value used to control said first controlled variable based on the signal from said condition detecting means, and for controlling said first regulating means with said computed parameter value to allow said operational condition of the engine to approach a requested condition;
second regulating means for regulating a second controlled variable, wherein the variance of the second controlled variable affects said first controlled variable;
determining means for determining whether the engine is properly functioning, said determining means determining that an abnormality has occurred in the engine when said parameter value computed by said first control means is continuously outside a predetermined numerical range over a predetermined period of time; and
range adjusting means for automatically adjusting said numerical range in accordance with a degree of influence of the variance in said second controlled variable on said first controlled variable.
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Accused Products
Abstract
A system, capable of determining an engine abnormality, is disclosed. The engine includes a first regulator for controlling air fuel ratio and a second regulator for controlling the purging amount of fuel vapor into an air-intake passage from a fuel tank. The variance in the purging amount effects the air fuel ratio. An engine control unit computes a parameter value used to control the air fuel ratio based on a signal from a detector which detects the operational condition of the engine, and controls the first regulator with the computed parameter value to allow the operational condition of the engine to approach a requested condition. A determining apparatus determines that an abnormality has occurred in the engine when the parameter value computed by the control unit continuously deviates from a predetermined numerical range for a predetermined period of time. The determining apparatus also automatically adjusts the numerical range in accordance with a degree of influence of the variance in the purging amount on the air fuel ratio.
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Citations
20 Claims
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1. An engine system capable of diagnosing an occurrence of malfunction in engine operation represented as a plurality of controlled variables associated with the engine operation, the engine system comprising:
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condition detecting means for detecting an operational condition of the engine and for outputting a signal indicative of the detection result; first regulating means for regulating a first controlled variable; first control means for computing a parameter value used to control said first controlled variable based on the signal from said condition detecting means, and for controlling said first regulating means with said computed parameter value to allow said operational condition of the engine to approach a requested condition; second regulating means for regulating a second controlled variable, wherein the variance of the second controlled variable affects said first controlled variable; determining means for determining whether the engine is properly functioning, said determining means determining that an abnormality has occurred in the engine when said parameter value computed by said first control means is continuously outside a predetermined numerical range over a predetermined period of time; and range adjusting means for automatically adjusting said numerical range in accordance with a degree of influence of the variance in said second controlled variable on said first controlled variable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for determining the occurrence of malfunction in the operation of an engine represented as a plurality of controlled variables associated with the engine operation, first regulating means for regulating a first controlled variable, second regulating means for regulating a second controlled variable, the variance of the second controlled variable affecting the first controlled variable, condition detecting means for detecting an operational condition of the engine and for outputting a signal indicative of the detection result, and control means for computing a parameter value used to control the first controlled variable based on the signal from the condition detecting means and for controlling the first regulating means with the computed parameter value to allow the operational condition of the engine to approach a requested condition, the apparatus comprising:
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determining means for determining whether the engine is properly functioning, said determining means determining that an abnormality has occurred in the engine when the parameter value computed by the control means is continuously outside a predetermined numerical range over a predetermined period of time; and range adjusting means for automatically adjusting said numerical range in accordance with a degree of influence of the variance in the second controlled variable on the first controlled variable. - View Dependent Claims (12, 13, 14)
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15. An engine system capable of diagnosing an occurrence of malfunction in engine operation represented as a plurality of controlled variables associated with the engine operation, the engine system comprising:
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a condition detecting device that detects an operational condition of the engine and outputs a signal indicative of the detection result; a first regulating device connected to the condition detecting device that regulates a first controlled variable; a first controlled device connected to the condition detecting device that computes a parameter value used to control the first controlled variable based on the signal from the condition detecting device, and that controls the first regulating device with the computed parameter value to allow the operational condition of the engine to approach a requested condition; a second regulating device connected to the condition detecting device that regulates a second controlled variable, wherein the variance of the second controlled variable affects the first controlled variable; a determining device connected to the condition detecting device that determines whether the engine is properly functioning, the determining device determining that an abnormality has occurred in the engine when the parameter value computed by the first control device is continuously outside a predetermined numerical range over a predetermined period of time; and a range adjusting device connected to the condition detecting device that automatically adjusts the numerical range in accordance with a degree of influence of the variance in the second control variable on the first controlled variable. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification