IN-VEHICLE DEVICE CONTROLLER AND POWER STEERING DEVICE
First Claim
1. An controller of an in-vehicle device with an actuator, the controller comprising:
- an operating condition detection system that detects an vehicle operating condition and outputs first and second operating condition detection signals, said first and second operating condition detection signals being detected by and outputted from a plurality of respective detection elements or being detected by a common detection element and outputted through respective different electronic circuits;
a first abnormality judgment circuit that judges the presence or absence of an abnormality in the first operating condition detection signal and, upon detection of an abnormality in the first operating condition detection signal, outputs the first operating condition detection signal with abnormality data contained therein as an output signal;
a second abnormality judgment circuit that detects the presence or absence of an abnormality in the second operating condition detection signal and, upon detection of the abnormality in the second operating condition detection signal, outputs the second operating condition detection signal with abnormality data contained therein as an output signal;
an ECU that performs drive control of the actuator;
a signal abnormality detection circuit arranged in the ECU such that the signal abnormality detection circuit receives the output signals of the first and second abnormality judgment circuits and detects the presence or absence of an abnormality in the respective output signals of the first and second abnormality judgment circuits; and
an actuator control circuit arranged in the ECU such that, when the signal abnormality detection circuit judges that no abnormality data is contained in the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs a drive control signal for drive control of the actuator in accordance with at least one of the output signals of the first and second abnormality judgment circuits and such that, when the signal abnormality detection circuit judges that the abnormality data is contained in one of the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs the drive control signal in accordance with the other of the output signals of the first and second abnormality judgment circuits.
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Accused Products
Abstract
An in-vehicle device controller has at least two redundant operating condition detection units. Under normal circumstances, the controller performs actuator drive control based on an operating condition detection signal of one of the operating condition detection units. Upon detection of an abnormality in the signal transmission state, data state or operating status of one of the at least two operating condition detection units, the controller performs actuator drive control based on an operating condition detection signal of another one of the at least two operating condition detection units in which no abnormality is present. By this control, the actuator function is preserved even in the event of the abnormality in the operating condition detection unit or operating condition detection signal.
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Citations
14 Claims
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1. An controller of an in-vehicle device with an actuator, the controller comprising:
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an operating condition detection system that detects an vehicle operating condition and outputs first and second operating condition detection signals, said first and second operating condition detection signals being detected by and outputted from a plurality of respective detection elements or being detected by a common detection element and outputted through respective different electronic circuits; a first abnormality judgment circuit that judges the presence or absence of an abnormality in the first operating condition detection signal and, upon detection of an abnormality in the first operating condition detection signal, outputs the first operating condition detection signal with abnormality data contained therein as an output signal; a second abnormality judgment circuit that detects the presence or absence of an abnormality in the second operating condition detection signal and, upon detection of the abnormality in the second operating condition detection signal, outputs the second operating condition detection signal with abnormality data contained therein as an output signal; an ECU that performs drive control of the actuator; a signal abnormality detection circuit arranged in the ECU such that the signal abnormality detection circuit receives the output signals of the first and second abnormality judgment circuits and detects the presence or absence of an abnormality in the respective output signals of the first and second abnormality judgment circuits; and an actuator control circuit arranged in the ECU such that, when the signal abnormality detection circuit judges that no abnormality data is contained in the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs a drive control signal for drive control of the actuator in accordance with at least one of the output signals of the first and second abnormality judgment circuits and such that, when the signal abnormality detection circuit judges that the abnormality data is contained in one of the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs the drive control signal in accordance with the other of the output signals of the first and second abnormality judgment circuits. - View Dependent Claims (2, 3, 4, 5)
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6. A power steering device, comprising:
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a steering system that steers steerable wheels in response to steering operation of a steering wheel; an electric motor that applies a steering force to the steering system; a steering condition detection system that detects a steering condition and outputs first and second steering condition detection signals, said first and second steering condition detection signals being detected by and outputted from a plurality of respective detection elements or being detected by a common detection element and outputted through respective different electronic circuits; a first abnormality judgment circuit that judges the presence or absence of an abnormality in the first steering condition detection signal and, upon detection of an abnormality in the first steering condition detection signal, outputs the first steering condition detection signal with abnormality data contained therein as an output signal; a second abnormality judgment circuit that detects the presence or absence of an abnormality in the second steering condition detection signal and, upon detection of the abnormality in the second steering condition detection signal, outputs the second steering condition detection signal with abnormality data contained therein as an output signal; an ECU having a microprocessor that performs drive control of the electric motor; a signal abnormality detection circuit arranged in the ECU such that the signal abnormality detection circuit receives the output signals of the first and second abnormality judgment circuits and detects the presence or absence of an abnormality in the respective output signals of the first and second abnormality judgment circuits; and a motor control circuit arranged in the ECU such that, when the signal abnormality detection circuit judges that no abnormality data is contained in the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs a drive control signal for drive control of the electric motor in accordance with at least one of the output signals of the first and second abnormality judgment circuits and such that, when the signal abnormality detection circuit judges that the abnormality data is contained in one of the output signals of the first and second abnormality judgment circuits, the actuator control circuit calculates and outputs the drive control signal in accordance with the other of the output signals of the first and second abnormality judgment circuits. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification