ELECTRONIC CONTROL APPARATUS
First Claim
1. An electronic control apparatus comprising:
- a control section supplied with electric power through a power switch to operate;
a timer circuit always supplied with electric power to operate irrespective of an on/off state of said power switch;
a power supply holding section operating to hold electric power supply to said control section after turn on of said power switch until reception of a power off command from said control section even though said power switch is turned off;
whereinsaid control section is configured to perform, upon detecting turn-off of said power switch, a first process in which there is detected a difference between a variation of a count value of said timer circuit for a first time period from a first time at which said power switch is turned on to start up said control section to a second time at which said power switch is turned off, and a variation of an internal timer of said control section from said first time to said second time, a second process in which it determined whether or not said difference detected by said first process is within a specified range, and a third process in which said timer circuit is judged to be abnormal if said difference detected by said first process is determined to be out of said specified range by said second process.
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Accused Products
Abstract
The electronic control apparatus includes a control section supplied with electric power through a power switch to operate, and a timer circuit always supplied with electric power to operate irrespective of an on/off state of the power switch. The control section is configured to perform a process in which the timer circuit is caused to make a reset-start after a frequency of a clock used in the timer circuit is changed from a first frequency for counting operation to a second frequency higher than the first frequency, and a process in which it is determined whether or not a count value of the timer circuit has reached its upper limit value when it is detected that a predetermined time has elapsed after the reset-start of the timer circuit on the basis of a count value of an internal timer of the timer circuit.
28 Citations
9 Claims
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1. An electronic control apparatus comprising:
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a control section supplied with electric power through a power switch to operate;
a timer circuit always supplied with electric power to operate irrespective of an on/off state of said power switch;a power supply holding section operating to hold electric power supply to said control section after turn on of said power switch until reception of a power off command from said control section even though said power switch is turned off; wherein said control section is configured to perform, upon detecting turn-off of said power switch, a first process in which there is detected a difference between a variation of a count value of said timer circuit for a first time period from a first time at which said power switch is turned on to start up said control section to a second time at which said power switch is turned off, and a variation of an internal timer of said control section from said first time to said second time, a second process in which it determined whether or not said difference detected by said first process is within a specified range, and a third process in which said timer circuit is judged to be abnormal if said difference detected by said first process is determined to be out of said specified range by said second process. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic control apparatus comprising:
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a control section supplied with electric power through a power switch to operate; and a timer circuit always supplied with electric power to operate irrespective of an on/off state of said power switch; wherein said control section is configured to perform a first process in which said timer circuit is caused to make a reset-start after a frequency of a clock used in said timer circuit is changed from a first frequency for counting operation to a second frequency higher than said first frequency, a second process in which it is determined whether or not a count value of said timer circuit has reached an upper limit value of said timer circuit when it is detected that a predetermined time has elapsed after said reset-start of said timer circuit on the basis of a count value of an internal timer of said timer circuit, and a third process in which said timer circuit is judged to be abnormal if said count value of said timer circuit is determined not to have reached said upper limit value by said second process. - View Dependent Claims (8, 9)
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Specification