Control system for a hybrid vehicle
First Claim
1. A control system for a hybrid vehicle having an auxiliary power unit, at least one energy storage device and at least one electric drive motor for traction, the vehicle having a high load driving condition, a low load driving condition, and a regenerative braking condition, the control system comprising:
- a voltage control to set system voltage to charging voltage of the energy storage device in the low load driving condition and the regenerative braking condition, and to set the system voltage to output voltage from the energy storage device for the high load driving condition;
a current control to set output from the auxiliary power unit to a charging level for the energy storage device in the low load driving condition and the regenerative braking condition, and to set the power level from the auxiliary power unit based on vehicle speed, motor load and state of charge of the energy device for the high load driving condition; and
control means to switch on the auxiliary power unit when the state of charge of the energy storage device is below a predetermined level and switch off the auxiliary power unit when the energy storage device is fully charged;
wherein the output power from the auxiliary power unit is set from statistical analysis of vehicle speed, the motor load and history of the state of charge of the energy storage device.
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Accused Products
Abstract
A control system for a hybrid vehicle ensures the best possible utilization of onboard energy resources for different operating conditions of the vehicle. The control system utilizes a strategy modified in real time depending on the input from sensors measuring vehicle speed, the current and voltage levels at different locations in the system. The vehicle has an auxiliary power unit, at least one energy storage device and at least one electric drive motor for traction. The vehicle has a high load driving condition, a low load driving condition and a regenerative braking condition. A voltage control sets system voltage to a charging voltage in the low load condition and regenerative braking condition, and sets system voltage to an output voltage from the energy storage device for the high load condition. A current control system sets output power from the auxiliary power unit to a charging level in the low load condition and regenerative braking condition, and sets the power level from the auxiliary power unit based on vehicle speed, motor load and state of charge of the energy storage device for the high load condition.
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Citations
13 Claims
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1. A control system for a hybrid vehicle having an auxiliary power unit, at least one energy storage device and at least one electric drive motor for traction, the vehicle having a high load driving condition, a low load driving condition, and a regenerative braking condition, the control system comprising:
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a voltage control to set system voltage to charging voltage of the energy storage device in the low load driving condition and the regenerative braking condition, and to set the system voltage to output voltage from the energy storage device for the high load driving condition; a current control to set output from the auxiliary power unit to a charging level for the energy storage device in the low load driving condition and the regenerative braking condition, and to set the power level from the auxiliary power unit based on vehicle speed, motor load and state of charge of the energy device for the high load driving condition; and control means to switch on the auxiliary power unit when the state of charge of the energy storage device is below a predetermined level and switch off the auxiliary power unit when the energy storage device is fully charged; wherein the output power from the auxiliary power unit is set from statistical analysis of vehicle speed, the motor load and history of the state of charge of the energy storage device. - View Dependent Claims (2, 3, 4, 5)
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6. A control system for a hybrid vehicle having an auxiliary power unit, at least one electrochemical battery and at least one electric drive motor for traction, the vehicle having a high load driving condition, a low load driving condition, and a regenerative braking condition, the control system comprising:
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a voltage control to set system voltage to charging voltage of the electrochemical battery in the low load driving condition and the regenerative braking condition, and to set the system voltage to output voltage from the electrochemical battery for the high load driving condition; a current control to set output from the auxiliary power unit to a charging level for the electrochemical battery in the low load driving condition and the regenerative braking condition, and to set the power level from the auxiliary power unit based on vehicle speed, motor load and state of charge of the electrochemical battery for the high load driving condition; control means to switch on the auxiliary power unit when the state of charge of the electrochemical battery is below a predetermined level and switch off the auxiliary power unit when the electrochemical battery is fully charged; and a battery temperature control system with a battery cooling system, the battery temperature control system maintaining the battery temperature within a predetermined range by activating the battery cooling system. - View Dependent Claims (7, 8)
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9. A method of controlling a hybrid vehicle having an auxiliary power unit, at least one energy storage device and at least one electric drive motor for traction, the vehicle having a high load driving condition when the motor is powered by the auxiliary power unit and the energy storage device, a low load driving condition when the auxiliary power unit provides power to the motor and to charge the energy storage device, and a regenerative braking condition when the auxiliary power unit and the motor provide power to charge the energy storage device, comprising the steps of:
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controlling system voltage to a charging voltage of the energy storage device in the low load driving condition and the regenerative braking condition; controlling the system voltage to an output voltage from the energy storage device for the high load driving condition; controlling the output power from the auxiliary power unit to a charging level for the energy storage device in the low load driving condition and the regenerative braking condition; controlling the output power from the auxiliary power unit to a level determined from statistical analysis of vehicle speed, motor load and state of charge of the energy storage device for the high load driving condition, and controlling the operation of the auxiliary power unit to provide power to charge the energy storage device when the state of charge of the energy storage device is below a predetermined level. - View Dependent Claims (10, 11, 12, 13)
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Specification