System for diagnosing an internal combustion engine
First Claim
1. A system for diagnosing operations of sensing systems of an internal combustion engine comprising:
- a first diagnosing circuit for diagnosing operation of a first of said sensing systems, said first diagnosing circuit including comparing means for comparing an input from said first sensing system with a reference and said first diagnosing circuit for producing a first output when the input is different than said reference;
means comprising a display responsive to said first output for indicating trouble in said first sensing system;
a second diagnosing circuit for diagnosing operation of a second of said sensing systems and for producing a second output when the operation of the second sensing system is abnormal;
gate means for electrically connecting the second output of said second diagnosing circuit with said display;
a manually operated terminal for producing a third output when operated; and
control means responsive to the third output for opening said gate means so as to apply an occurrence of said second output to the display to indicate abnormality of the diagnosing of said second diagnosing circuit.
1 Assignment
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Accused Products
Abstract
A system for diagnosing operations of sensing systems of an internal combustion engine. The system comprises a first diagnosing circuit for diagnosing operation of an important system, such as a coolant temperature sensor, the first diagnosing circuit including a comparator for comparing an input from the sensing system with a reference range and for producing an output when the input is out of the range. A display is provided responsive to the output of the first diagnosing circuit indicating trouble in the sensing system, and a second diagnosing circuit is provided for diagnosing operation of a minor sensing system and for producing an output when the input from the sensing system is abnormal. A gate is provided for electrically connecting the output of the second diagnosing circuit with the display. A manually operated control circuit is provided for operating the gate so as to display the result of the diagnosing of the second diagnosing circuit.
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Citations
13 Claims
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1. A system for diagnosing operations of sensing systems of an internal combustion engine comprising:
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a first diagnosing circuit for diagnosing operation of a first of said sensing systems, said first diagnosing circuit including comparing means for comparing an input from said first sensing system with a reference and said first diagnosing circuit for producing a first output when the input is different than said reference; means comprising a display responsive to said first output for indicating trouble in said first sensing system; a second diagnosing circuit for diagnosing operation of a second of said sensing systems and for producing a second output when the operation of the second sensing system is abnormal; gate means for electrically connecting the second output of said second diagnosing circuit with said display; a manually operated terminal for producing a third output when operated; and control means responsive to the third output for opening said gate means so as to apply an occurrence of said second output to the display to indicate abnormality of the diagnosing of said second diagnosing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for diagnosing operations of sensing systems of an internal combustion engine comprising:
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a first diagnosing circuit for diagnosing operation of a first of said sensing system, said first diagnosing circuit including comparing means for comparing an input from said first sensing system with a reference value and for producing a first output when the input does not coincide with said reference value; a display responsive to said first output for indicating trouble in said first sensing system; a second diagnosing circuit for diagnosing operation of a second of said sensing systems and for producing a second output when an input from the second sensing system is abnormal; gate means for electrically connecting the second output of said second diagnosing circuit with said display; manually operated control means for operating said gate means, so as to display a result of the diagnosing of said second diagnosing circuit; said manually operated control means comprising a manually operated connector; and a gate responsive to the operation of the connector for producing an output to operate said gate means after a predetermined time.
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13. A system for diagnosing operations of sensing systems of an internal combustion engine comprising:
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means comprising a first diagnosing circuit for diagnosing operation of a first of said sensing systems, and for producing a first output when the operation of the first of said sensing systems is abnormal; means comprising a display responsive to said first output for indicating trouble in said first sensing system; means comprising a plurality of second diagnosing circuits for diagnosing operation of second of said sensing systems and for producing respectively a second output when the operation of a respective of the second sensing systems is abnormal; gate means for electrically connecting the respective second output of said second diagnosing circuits with said display; a manually operated terminal for producing a third output when operated; and control means responsive to the third output for opening said gate means so as to apply an occurrence of said respective second output to the display to indicate abnormality of the diagnosing of said second diagnosing circuits.
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Specification