In-vehicle equipment remote control system
First Claim
Patent Images
1. An in-vehicle equipment remote control system comprising:
- a portable unit which receives a request signal and transmits a response signal in response to the request signal; and
a controlling means mounted in a vehicle for periodically transmitting the request signal in a predetermined area around the vehicle, and controlling an operation of in-vehicle equipment, when triggered by reception of the response signal from the portable unit, wherein the controlling means includes a request signal generation circuit for generating the request signal, a modulation and transmission circuit for modulating and transmitting the request signal generated by the request signal generation circuit, a clock signal generation circuit for generating clock signals used to modulate the request signal in the modulation and transmission circuit, and a microcomputer for instructing at least the request signal generation circuit to generate the request signal, wherein the microcomputer has a normal operation mode and a low-power consumption mode, instructs the request signal generation circuit to generate the request signal in the normal operation mode, and thereafter shifts from the normal operation mode to the low-power consumption mode, and wherein the request signal generation circuit utilizes the clock signals generated by the clock signal generation circuit and continues operation thereof with the clock signals even after the microcomputer shifts to the low-power consumption mode.
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Abstract
In a security ECU, a CPU instructs a request generation circuit to generate a request signal in the normal operation mode. Thereafter, the CPU shifts from the normal operation mode to the low-power consumption mode. The request generation circuit utilizes clock signals generated by a clock signal generation circuit and continues operation even after the CPU shifts to the low-power consumption mode. Thus, the time for which the CPU operates in the normal operation mode can be reduced, and the power consumption of the entire system is thereby reduced.
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Citations
20 Claims
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1. An in-vehicle equipment remote control system comprising:
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a portable unit which receives a request signal and transmits a response signal in response to the request signal; and
a controlling means mounted in a vehicle for periodically transmitting the request signal in a predetermined area around the vehicle, and controlling an operation of in-vehicle equipment, when triggered by reception of the response signal from the portable unit, wherein the controlling means includes a request signal generation circuit for generating the request signal, a modulation and transmission circuit for modulating and transmitting the request signal generated by the request signal generation circuit, a clock signal generation circuit for generating clock signals used to modulate the request signal in the modulation and transmission circuit, and a microcomputer for instructing at least the request signal generation circuit to generate the request signal, wherein the microcomputer has a normal operation mode and a low-power consumption mode, instructs the request signal generation circuit to generate the request signal in the normal operation mode, and thereafter shifts from the normal operation mode to the low-power consumption mode, and wherein the request signal generation circuit utilizes the clock signals generated by the clock signal generation circuit and continues operation thereof with the clock signals even after the microcomputer shifts to the low-power consumption mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An in-vehicle equipment remote control system comprising:
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a portable unit which receives a request signal and transmits a response signal in response to the request signal; and
a controlling means mounted in a vehicle for periodically transmitting the request signal in a predetermined area around the vehicle, and controlling operation of in-vehicle equipment, when triggered by reception of the response signal from the portable unit, wherein the controlling means includes, a modulation and transmission circuit for modulating and transmitting the request signal, a clock signal generation circuit for generating clock signals used to modulate the request signal in the modulation and transmission circuit, a receiver circuit for receiving the response signal from the portable unit, a determination circuit for determining whether the response signal received by the receiver circuit corresponds to a predetermined response signal, and a microcomputer for generating a control signal for controlling the operation of at least the in-vehicle equipment, wherein the microcomputer has a normal operation mode and a low-power consumption mode, and is brought into the low-power consumption mode when the response signal is received, and wherein the determination circuit operates based on the clock signals generated by the clock signal generation circuit, and outputs a start signal to the microcomputer to change the operation mode of the microcomputer from the low-power consumption mode to the normal operation mode when the response signal received by the receiver circuit corresponds to a predetermined response signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An in-vehicle equipment remote control system comprising:
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a portable unit for receiving a request signal and transmitting a response signal in response to the request signal; and
a controlling means mounted in a vehicle for periodically transmitting the request signal in a predetermined area around the vehicle, and controlling the operation of in-vehicle equipment, when triggered by reception of the response signal from the portable unit, wherein the controlling means includes a request signal generation circuit for generating the request signal, a modulation and transmission circuit for modulating and transmitting the request signal generated by the request signal generation circuit, a clock signal generation circuit for generating clock signals used to modulate the request signal in the modulation and transmission circuit, a receiver circuit for receiving the response signal from the portable unit, a determination circuit for determining whether the response signal received by the receiver circuit corresponds to a predetermined response signal, and a microcomputer for instructing at least the request signal generation circuit to generate the request signal, and generating a control signal for controlling the operation of the in-vehicle equipment, wherein the microcomputer has a normal operation mode and a low-power consumption mode, and instructs the request signal generation circuit to generate the request signal in the normal operation mode, and thereafter shifts from the normal operation mode to the low-power consumption mode, wherein the request signal generation circuit and the determination circuit operate based on the clock signals generated by the clock signal generation circuit, wherein the receiver circuit receives the response signal generated by the request signal generation circuit according to the request signal, and wherein the determination circuit outputs a start signal to the microcomputer to change an operation mode of the microcomputer from the low-power consumption mode to the normal operation mode when the determination circuit determines that the response signal corresponds to the predetermined response signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification