Electrical control unit for an automobile
First Claim
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1. An electrical control unit for an automobile comprising:
- a microcomputer which controls equipment installed in automobile, an input circuit which passes an electric signal from the outside to said microcomputer, a driver circuit which outputs the electric signal output from said microcomputer outside, and a power supply circuit which supplies power supply to said computer, wherein said microcomputer is started by shifting said power supply circuit from an inert state to an active state to generate the voltage by which said microcomputer is operated by a wake-up signal from the circuit other than the ignition switch even when the ignition switch of said automobile is cut off, and the predetermined processing is executed by the microcomputer.
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Abstract
An electrical control unit for an automobile of which standby current is smaller. In an electrical control unit for an automobile having a microcomputer, an input circuit, a driver circuit, and a power supply circuit, which is started by a wake-up signal from the circuit other than the ignition switch even when the ignition switch of the automobile is cut off, the microcomputer is started by shifting the power supply circuit from an inert state to an active state to generate the voltage for operating the microcomputer, and the predetermined processing is executed.
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Citations
18 Claims
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1. An electrical control unit for an automobile comprising:
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a microcomputer which controls equipment installed in automobile, an input circuit which passes an electric signal from the outside to said microcomputer, a driver circuit which outputs the electric signal output from said microcomputer outside, and a power supply circuit which supplies power supply to said computer, wherein said microcomputer is started by shifting said power supply circuit from an inert state to an active state to generate the voltage by which said microcomputer is operated by a wake-up signal from the circuit other than the ignition switch even when the ignition switch of said automobile is cut off, and the predetermined processing is executed by the microcomputer. - View Dependent Claims (2, 3, 7)
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4. An electrical control unit for an automobile comprising:
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a microcomputer which controls equipment installed in automobile, an input circuit which passes an electric signal from the outside to said microcomputer, a driver circuit which outputs the electric signal output from said microcomputer outside, and a power supply circuit which supplies power supply to said computer, wherein said electrical control unit for the automobile is started by a wake-up signal from the circuit other than the ignition switch even when the ignition switch of said automobile is cut off, said wake-up signal is a signal output by a timer module built into said electrical control unit for the automobile or an electrical control unit other than said electrical control unit for the automobile, and said timer module provides with a counter, a wake-up timing setting register, and a comparator, and when the value of said counter reaches the value set in said wake-up timing setting register beforehand, said wake-up signal is output. - View Dependent Claims (5, 6, 8, 9, 14, 15, 17)
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10. An electrical control unit for an automobile comprising:
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a microcomputer which controls equipment installed in automobile, an input circuit which passes an electric signal from the outside to said microcomputer, a driver circuit which outputs the electric signal output from said microcomputer outside, and a power supply circuit which supplies power supply to said computer, wherein said power supply circuit is a semiconductor IC integrated the following components;
a first regulator which generates the voltage to operate said microcomputer by inputting said ignition switch signal or said wake-up signal, a second regulator which operates even when said ignition switch is cut off, an OR circuit activating said first regulator by using either the ignition switch signal or one of said plural wake-up signals, a start factor determining means to distinguish whether said first regulator is activated by which signal of the ignition switch signal and one of plural wake-up signals, a communication driver which transmits and receives the communication signal with an outside electrical control unit through a communications line, a latch circuit to latch the wake-up signals transmitted from the outside electrical control unit through said communications line, a reset circuit which generates a reset signal to said microcomputer, a watchdog timer to prevent the runaway of the active program in said microcomputer, and a serial communications module which communicates serially with said microcomputer. - View Dependent Claims (11, 12, 13, 16, 18)
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Specification
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Current AssigneeHitachi Astemo Ltd. (Hitachi, Ltd.)
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Original AssigneeHitachi, Ltd.
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InventorsKanekawa, Nobuyasu, Oyama, Katsuya, Sasaki, Shoji, Sakurai, Kohei, Watabe, Mitsuru
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current701/1
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CPC Class CodesF02D 41/062 for starting F02D41/061 tak...F02D 41/1494 Control of sensor heaterF02D 41/26 using computer, e.g. microp...F02N 2300/302 using data communicationG06F 1/3215 Monitoring of peripheral de...
