CONTROL SYSTEM AND METHOD FOR HYBRID VEHICLE
First Claim
1. A control system for a hybrid vehicle driven to travel using at least one of an engine and a traveling motor as a main driving source, the hybrid vehicle comprising:
- a generator driven by an engine;
a high-voltage power source connected to the generator and the traveling motor via a driving circuit;
a low-voltage power source charged at a voltage lower than that of the high-voltage power source;
an electric power steering device connected to the driving circuit via a voltage-reducing circuit and driven by supplied power of a voltage intermediate between the low voltage of the low-voltage power source and the high voltage of the high-voltage power source;
a voltage-increasing circuit provided between the low-voltage power source and the electric power steering device and configured to increase the low voltage of the low-voltage power source and to supply the increased voltage to the electric power steering device; and
a control section,wherein the control section comprises;
first mode execution unit for allowing the voltage-reducing circuit to reduce the high voltage of the high-voltage power source and supplying a resultant intermediate voltage to the electric power steering device;
second mode execution unit for allowing the voltage increasing circuit to increase the low voltage of the low-voltage power source and supplying the resultant intermediate voltage to the electric power steering device;
third mode execution unit for, with the high-voltage power source and the driving circuit disconnected from each other, allowing the voltage-reducing circuit to reduce a voltage corresponding to power generated by the generator and supplying the resultant intermediate voltage to the electric power steering device; and
high-voltage power source defect processing unit for, while the first mode is being executed and when a defect arises in the high-voltage power source, shifting from execution of the first mode to execution of the second mode, then disconnecting the high-voltage power source and the driving circuit from each other, and thereafter shifting the second mode to the third mode, while allowing the traveling motor to be driven by power generated by the generator.
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Accused Products
Abstract
The present invention is to provide a control system for a hybrid vehicle in which, even if during traveling of the hybrid vehicle, a battery defect arises in a high-voltage power source, battery-less emergency traveling can be achieved over a sufficiently long distance, and the steering assist force can be effectively prevented from changing rapidly during traveling. The control section includes high-voltage power source defect processing unit. During execution of a mode in which the high-voltage power source, is reduced so that the reduced voltage is supplied to an electric power steering device (EPS), when a defect occurs in the high-voltage power source, the high-voltage power source defect processing unit shifts to a mode in which the low voltage of a low-voltage power source is increased so that the increased voltage is supplied to the EPS. The high-voltage power source defect processing unit then disconnects the high-voltage power source and the driving circuit from each other. Thereafter, the control section shifts to a mode in which a voltage corresponding to power generated by a generator is reduced so that the reduced voltage is supplied to the EPS, while allowing the generator to drive a traveling motor.
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Citations
9 Claims
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1. A control system for a hybrid vehicle driven to travel using at least one of an engine and a traveling motor as a main driving source, the hybrid vehicle comprising:
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a generator driven by an engine; a high-voltage power source connected to the generator and the traveling motor via a driving circuit; a low-voltage power source charged at a voltage lower than that of the high-voltage power source; an electric power steering device connected to the driving circuit via a voltage-reducing circuit and driven by supplied power of a voltage intermediate between the low voltage of the low-voltage power source and the high voltage of the high-voltage power source; a voltage-increasing circuit provided between the low-voltage power source and the electric power steering device and configured to increase the low voltage of the low-voltage power source and to supply the increased voltage to the electric power steering device; and a control section, wherein the control section comprises; first mode execution unit for allowing the voltage-reducing circuit to reduce the high voltage of the high-voltage power source and supplying a resultant intermediate voltage to the electric power steering device; second mode execution unit for allowing the voltage increasing circuit to increase the low voltage of the low-voltage power source and supplying the resultant intermediate voltage to the electric power steering device; third mode execution unit for, with the high-voltage power source and the driving circuit disconnected from each other, allowing the voltage-reducing circuit to reduce a voltage corresponding to power generated by the generator and supplying the resultant intermediate voltage to the electric power steering device; and high-voltage power source defect processing unit for, while the first mode is being executed and when a defect arises in the high-voltage power source, shifting from execution of the first mode to execution of the second mode, then disconnecting the high-voltage power source and the driving circuit from each other, and thereafter shifting the second mode to the third mode, while allowing the traveling motor to be driven by power generated by the generator. - View Dependent Claims (2, 3, 4, 5)
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6. A control method for a hybrid vehicle driven to travel using at least one of an engine and a traveling motor as a main driving source, the hybrid vehicle comprising:
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a generator driven by an engine; a high-voltage power source connected to the generator and the traveling motor via a driving circuit; a low-voltage power source charged at a voltage lower than that of the high-voltage power source; an electric power steering device connected to the driving circuit via a voltage-reducing circuit and driven by supplied power of a voltage intermediate between the low voltage of the low-voltage power source and the high voltage of the high-voltage power source; a voltage-increasing circuit provided between the low-voltage power source and the electric power steering device and configured to increase the low voltage of the low-voltage power source and to supply the increased voltage to the electric power steering device; and
a control section,wherein the control section comprises; first mode execution unit for allowing the voltage-reducing circuit to reduce the high voltage of the high-voltage power source and supplying a resultant intermediate voltage to the electric power steering device; second mode execution unit for allowing the voltage-increasing circuit to increase the low voltage of the low-voltage power source and supplying the resultant intermediate voltage to the electric power steering device; and third mode execution unit for, with the high-voltage power source and the driving circuit disconnected from each other, allowing the voltage-reducing circuit to reduce a voltage corresponding to power generated by the generator and supplying the resultant intermediate voltage to the electric power steering device, and the method comprises a high-voltage power source defect process step in which while the first mode is being executed and a defect arises in the high-voltage power source, the control section shifts from execution of the first mode to execution of the second mode, then disconnects the high-voltage power source and the driving circuit from each other, and thereafter shifts the second mode to the third mode, while allowing the traveling motor to be driven by power generated by the generator. - View Dependent Claims (7, 8, 9)
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Specification