On-vehicle electronic control apparatus with timer-based power supply
First Claim
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1. An electronic control apparatus to be mounted in an automotive vehicle having a battery and an ignition key switch to switch on/off electric power of the battery, comprising:
- an auxiliary circuit connected to the battery so as to restlessly receive the electric power from the battery and formed to have a timer for restlessly executing a timer counting operation to count a predetermined timer activation time; and
a main circuit formed to be activated by the electric power from the battery and to execute predetermined processing only when the predetermined timer activation time has been counted by said auxiliary circuit or the ignition key switch is turned on.
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Abstract
An auxiliary circuit continuously executes a timer counting operation under a condition that electric power is directly supplied from a vehicle battery to the auxiliary circuit. A main circuit receives no electric power during a waiting condition and hence minimizes current consumption. Only when a predetermined timer activation time is counted by the auxiliary circuit or an ignition key switch is turned on, electric power is supplied to the main circuit for allowing the main circuit to execute a zero point correction for load sensors.
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Citations
18 Claims
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1. An electronic control apparatus to be mounted in an automotive vehicle having a battery and an ignition key switch to switch on/off electric power of the battery, comprising:
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an auxiliary circuit connected to the battery so as to restlessly receive the electric power from the battery and formed to have a timer for restlessly executing a timer counting operation to count a predetermined timer activation time; and a main circuit formed to be activated by the electric power from the battery and to execute predetermined processing only when the predetermined timer activation time has been counted by said auxiliary circuit or the ignition key switch is turned on. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electronic control apparatus to be mounted in an automotive vehicle having a battery and an ignition key switch to switch on/off electric power of the battery, comprising:
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a control circuit, operative in response to reception of predetermined electric power, for performing predetermined control processing; a power supply circuit producing the predetermined electric power for the control circuit from the electric power of the battery; an auxiliary circuit restlessly receiving the electric power from the battery, having a timer restlessly counting time, and outputting an establishment signal when the time count has reached a predetermined activation time; and a detection circuit detecting a condition in which either the timer signal is outputted from the auxiliary circuit or the ignition key switch is subjected to a turn-on operation thereof and allowing the power supply circuit to supply the predetermined electric power to the control circuit only when either the output of the timer signal or the turn-on operation of the ignition key switch is detected. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An electronic control apparatus to be mounted in an automotive vehicle having a battery and an ignition key switch to switch on/off electric power of the battery, comprising:
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control means, operative in response to reception of predetermined electric power, for performing predetermined control processing; power supply means for producing the predetermined electric power for the control means from the electric power of the battery; auxiliary circuit means for restlessly receiving the electric power from the battery, having a timer restlessly counting time, and outputting an establishment signal when the time count has reached a predetermined activation time; and detection means for detecting a condition in which either the timer signal is outputted from the auxiliary circuit means or the ignition key switch is subjected to a turn-on operation thereof and allowing the power supply means to supply the predetermined electric power to the control means only when either the output of the timer signal or the turn-on operation of the ignition key switch is detected.
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Specification