ELECTRONIC CONTROL UNIT FOR VEHICLE
First Claim
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1. A vehicle electronic control unit comprising:
- a first microcomputer; and
a second microcomputer capable of transmitting and receiving a signal to and from the first microcomputer, whereinone of the first microcomputer and the second microcomputer outputs a voltage signal that indicates a voltage at a high level or a low level to the other microcomputer, the other microcomputer detects a high-time during which the voltage of the voltage signal is at the high level, performs a self diagnosis according to the detected high-time, and outputs a result of the self diagnosis to the one microcomputer, and the one microcomputer diagnoses the other microcomputer based on a result of the self diagnosis.
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Abstract
To provide a vehicle electronic control unit including a first microcomputer (2, 3) and a second microcomputer (3, 2) capable of transmitting and receiving signals to and from the first microcomputer. One of the first microcomputer and the second microcomputer outputs a PWM signal to the other microcomputer (3, 2). The other microcomputer detects an on-time of the PWM signal, performs a self diagnosis according to the detected on-time, and outputs a self diagnosis result to the one microcomputer. The one microcomputer diagnoses the other microcomputer based on the self diagnosis result.
8 Citations
6 Claims
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1. A vehicle electronic control unit comprising:
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a first microcomputer; and
a second microcomputer capable of transmitting and receiving a signal to and from the first microcomputer, whereinone of the first microcomputer and the second microcomputer outputs a voltage signal that indicates a voltage at a high level or a low level to the other microcomputer, the other microcomputer detects a high-time during which the voltage of the voltage signal is at the high level, performs a self diagnosis according to the detected high-time, and outputs a result of the self diagnosis to the one microcomputer, and the one microcomputer diagnoses the other microcomputer based on a result of the self diagnosis. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification