Electronic safing system
First Claim
1. An electronic safing system, comprising:
- a safing sensor which detects a physical quantity responsive to a collision of a vehicle and outputs a voltage signal according to a detected result;
a comparing circuit which compares the voltage signal from the safing sensor with a reference voltage and outputs a signal corresponding to the comparison result;
a microcomputer which determines whether a collision occurs or not based on the output voltage of the safing sensor and the output of the comparing circuit, whereinthe safing sensor has an output terminal which is connected to an input terminal of the comparing circuit, and whereinthe microcomputer has a programmable analog I/O port which is connected to a built-in AD-DA converter and can be switched to an analog input port and an analog output port in a selectable manner according to an internal register, the programmable analog I/O port being connected with the input terminal of the comparing circuit, and wherein the microcomputer switches the programmable analog I/O port to the analog output port and outputs a predetermined voltage when diagnosing the comparing circuit, and diagnoses the comparing circuit by monitoring the output of the comparing circuit.
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Accused Products
Abstract
The electronic safing system is provided with a safing sensor, a comparator, and a microcomputer. The microcomputer has a programmable analog I/O port which is connected to a built-in AD-DA converter. The programmable analog I/O port can be switched to an analog input port and an analog output port according to an internal register. The programmable analog I/O port is connected to an input terminal of the comparator. When diagnosing the comparing circuit, the microcomputer switches the programmable analog I/O port to the analog output port and outputs a predetermined voltage for diagnosis. Then, the microcomputer diagnoses the comparing circuit by monitoring the output of the comparing circuit.
203 Citations
7 Claims
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1. An electronic safing system, comprising:
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a safing sensor which detects a physical quantity responsive to a collision of a vehicle and outputs a voltage signal according to a detected result; a comparing circuit which compares the voltage signal from the safing sensor with a reference voltage and outputs a signal corresponding to the comparison result; a microcomputer which determines whether a collision occurs or not based on the output voltage of the safing sensor and the output of the comparing circuit, wherein the safing sensor has an output terminal which is connected to an input terminal of the comparing circuit, and wherein the microcomputer has a programmable analog I/O port which is connected to a built-in AD-DA converter and can be switched to an analog input port and an analog output port in a selectable manner according to an internal register, the programmable analog I/O port being connected with the input terminal of the comparing circuit, and wherein the microcomputer switches the programmable analog I/O port to the analog output port and outputs a predetermined voltage when diagnosing the comparing circuit, and diagnoses the comparing circuit by monitoring the output of the comparing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification