Control system for hybrid vehicle
First Claim
1. A control system for a hybrid vehicle for controlling the hybrid vehicle comprising a power apparatus consuming fuel and generating power, a battery storing electrical power, and a motor converting electrical power to mechanical power transmitted to a drive wheel of the vehicle, the control system including a detector detecting an operating condition of the vehicle, and programmed to:
- calculate a required power indicating a power required to drive the vehicle, based on the operating condition of the vehicle;
calculate a first parameter indicating a ratio between a fuel consumption rate and the required power for running the power apparatus so as to generate a power equal to the required power;
set a threshold value with respect to the first parameter, based on a charging state of the battery;
run the power apparatus so as to generate a power larger than the required power when the first parameter is smaller than the threshold value, and transmit part of the power generated to the drive wheel, and store a remainder of the power generated in the battery; and
run the power apparatus so as to generate a power smaller than the required power when the first parameter is larger than the threshold value, and transmit all of the power generated to the drive wheel, and transmit part of a power stored in the battery to the drive wheel.
1 Assignment
0 Petitions
Accused Products
Abstract
A control system for a hybrid vehicle has a consumed electric power calculator (20), which calculates electric power consumption, and a battery state calculator (21), which calculates battery state SOC of a battery (5). Based on this battery state, a physical quantity per effective electric power calculator (25) calculates a physical quantity per effective power when electric power equal to or greater than consumed electric power is generated for various electric power consumption and electric power generation, and a threshold value calculator (22) obtains a threshold value having the same unit as that of the physical quantity per effective power using predetermined calculation for selecting operating modes of a generator and the battery. An operating mode selector (23) selects operating modes for an engine (1) and the battery (5) based on comparison between the above threshold value and the physical quantity per effective power corresponding to the consumed electric power, and a target generated electric power calculator (24) calculates target electric power generation. An electric power distribution controller (6) controls the engine (1) and the motor (3).
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Citations
13 Claims
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1. A control system for a hybrid vehicle for controlling the hybrid vehicle comprising a power apparatus consuming fuel and generating power, a battery storing electrical power, and a motor converting electrical power to mechanical power transmitted to a drive wheel of the vehicle, the control system including a detector detecting an operating condition of the vehicle, and programmed to:
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calculate a required power indicating a power required to drive the vehicle, based on the operating condition of the vehicle;
calculate a first parameter indicating a ratio between a fuel consumption rate and the required power for running the power apparatus so as to generate a power equal to the required power;
set a threshold value with respect to the first parameter, based on a charging state of the battery;
run the power apparatus so as to generate a power larger than the required power when the first parameter is smaller than the threshold value, and transmit part of the power generated to the drive wheel, and store a remainder of the power generated in the battery; and
run the power apparatus so as to generate a power smaller than the required power when the first parameter is larger than the threshold value, and transmit all of the power generated to the drive wheel, and transmit part of a power stored in the battery to the drive wheel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
run the power apparatus at an operating condition under which a second parameter coincides with the threshold value when the first parameter is smaller than the threshold value, the second parameter indicating a ratio between a fuel consumption rate and an effective power for running the power apparatus so as to generate a power larger than the required power, the effective power indicating a sum of the required power and an usable power indicating part of the remainder of the power generated.
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3. A control system for a hybrid vehicle according to claim 2, further programmed to;
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calculate a charging efficiency and discharging efficiency of the battery, based on the charging state of the battery; and
calculate the usable power by multiplying the remainder of the power generated by the charging efficiency and the discharging efficiency.
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4. A control system for a hybrid vehicle according to claim 1, further programmed to;
run the power apparatus at an operating condition under which a third parameter coincides with the threshold value when the first parameter is larger than the threshold value when the first parameter is larger than the threshold value, the third parameter indicating a ratio between a fuel consumption rate and the power generated.
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5. A control system for a hybrid vehicle according to claim 1, further programmed to:
stop the running of the power apparatus when the first parameter is larger than the threshold value.
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6. A control system for a hybrid vehicle according to claim 1, further programmed to:
run the power apparatus so as to generate a power equal to the required power when the first parameter is equal to the threshold value, and transmit all of the power generated to the drive wheel.
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7. A control system for a hybrid vehicle according to claim 1, further programmed to:
gradually reduce the threshold value when actual charging state of the battery is greater than the target charging state, and gradually increase the threshold value when the actual charging state of the battery is less than the target charging state.
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8. A control system for a hybrid vehicle according to claim 1, further programmed to:
reduce the threshold value more, the greater is the actual charging state of the battery.
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9. A control system for a hybrid vehicle according to claim 1, further programmed to:
compensate the threshold value with respect to a temperature of the battery.
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10. A control system for a hybrid vehicle according to claim 1, wherein the power apparatus comprises an engine consuming fuel and generating mechanical power, and a generator converting mechanical power generated by the engine to electric power.
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11. A control system for a hybrid vehicle according to claim 1, wherein the power apparatus comprises an engine consuming fuel and generating mechanical power, and wherein the hybrid vehicle further comprises a transmission transmitting mechanical power generated by the engine to a drive wheel of the vehicle.
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12. A control system for a hybrid vehicle according to claim 1, wherein the power apparatus comprises an engine consuming fuel and generating mechanical power, and a generator converting mechanical power generated by the engine to electric power, and wherein the hybrid vehicle further comprises a transmission transmitting mechanical power generated by the engine to a drive wheel of the vehicle.
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13. A control system for a hybrid vehicle according to claim 1, wherein the power apparatus is a fuel cell consuming fuel and generating electric power.
Specification