Rate-based monitoring for an engine system
First Claim
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1. An engine management system comprising:
- a rate based monitor operable to perform test cycles on a monitored system when predetermined conditions are met, a test cycle being completed when a correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the rate based monitor comprising;
a counter for counting a number of times a completed test cycle is performed; and
a timer operable to define a test cycle completion timing, the timer timing a test cycle from a start of a test cycle until a timing when the correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the timer being reset if one or more of the predetermined conditions cease to be met;
wherein the counter is updated in response to the timer timing out on completion of a test cycle.
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Abstract
Rate based monitoring includes performing test cycles on a monitored system when predetermined conditions are met. Completion of a test cycle is determined by timing a period that is at least as long as the longer of a time required to detect a correct operation of the monitored system and a time to detect a malfunction of the monitored system, the timing being reset if one or more of the predetermined conditions cease to be met. A count is kept of completed test cycles.
20 Citations
20 Claims
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1. An engine management system comprising:
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a rate based monitor operable to perform test cycles on a monitored system when predetermined conditions are met, a test cycle being completed when a correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the rate based monitor comprising; a counter for counting a number of times a completed test cycle is performed; and a timer operable to define a test cycle completion timing, the timer timing a test cycle from a start of a test cycle until a timing when the correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the timer being reset if one or more of the predetermined conditions cease to be met; wherein the counter is updated in response to the timer timing out on completion of a test cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle comprising an engine management system, the engine management system comprising:
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a rate based monitor operable to perform test cycles on a monitored system when predetermined conditions are met, a test cycle being completed when a correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the rate based monitor comprising; a counter for counting a number of times a completed test cycle is performed; and a timer operable to define a test cycle completion timing, the timer timing a test cycle from a start of a test cycle until a timing when the correct operation or malfunction of the monitored system could have been detected irrespective of whether a malfunction or correct operation is detected, the timer being reset if one or more of the predetermined conditions cease to be met; wherein the counter is updated in response to the timer timing out on completion of a test cycle. - View Dependent Claims (11)
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12. An engine management rate based monitoring method for performing test cycles on a monitored system, the test cycle only being performed when predetermined conditions are met, the method comprising:
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maintaining a count of a number of times a completed test cycle is performed; timing completion of a test cycle by timing a period that is at least as long as the longer of a time required to detect a correct operation of the monitored system and a time to detect a malfunction of the monitored system, the timing being reset if one or more of the predetermined conditions cease to be met; and updating the count on completion of the timed period. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification