Hybrid electric vehicle with enhanced battery control
First Claim
1. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
- a block determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and
a block determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle.
1 Assignment
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Accused Products
Abstract
A method and system for enhanced battery control improves the performance of a hybrid electric vehicle (HEV). The HEV includes an internal combustion engine, at least one motor operable as a generator and a battery. A hybrid control module determines various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle. It also determines various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle. The allowances and periods of time may be used as limits that are imposed on commands for the motor.
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Citations
20 Claims
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1. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
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a block determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and a block determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle. - View Dependent Claims (3, 4, 7, 9, 10, 15)
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2. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
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a block determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and a block determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle, wherein the determined periods of time are related to the determined discharge and recharge allowances such that a shorter period of time is set for a greater allowance. - View Dependent Claims (16)
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5. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
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a block determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; a block determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle; a block estimating an actual state of charge (SOC) of the battery; and a block calculating a discharge limit of the battery and a recharge limit of the battery in response to the estimated actual SOC of the battery, the discharge and recharge limits being used as constraints in determining various discharge and recharge allowances and in determining various periods of time, wherein the various discharge and recharge allowances are determined based on open-end voltage of the battery when a measure of the open-end voltage is the only available information for estimating the actual SOC of the battery. - View Dependent Claims (6)
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8. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
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a block determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and a block determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle, wherein the maximum discharge allowance and the minimum period of time for discharge are determined in response to a request for engine start, a request for 4WD (slip), a request for duet control (shift down) and a request for motor action for roll-back avoidance (uphill); and
wherein the minimum discharge allowance and the maximum period of time for discharge are determined in response to a request for torque assist by motor and a request for motor running (creep start); and
wherein the intermediate discharge allowance and the intermediate period of time for discharge are determined in response to a request for 4WD start.
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11. A system for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the system comprising:
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means for determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and means for determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle. - View Dependent Claims (17)
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12. A method for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the method comprising:
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determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle. - View Dependent Claims (18)
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13. A computer readable storage medium having stored therein data representing instructions executable by a computer for enhanced battery control that improves the performance of a hybrid electric vehicle, the hybrid electric vehicle including an internal combustion engine and at least one motor operable as a generator and a battery, the computer readable storage medium comprising:
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instructions for determining various discharge and recharge allowances limiting operation of the battery with different operating conditions of the hybrid electric vehicle; and instructions for determining various periods of time limiting operation of the battery with different operating conditions of the hybrid electric vehicle. - View Dependent Claims (19)
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14. A hybrid electric vehicle comprising:
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an internal combustion engine; at least one motor operable in response to motor commands, both the internal combustion engine and the motor being provided to apply driving torque to road wheels of the vehicle, the motor being operable as a generator; a battery that is operable in discharge mode to energize the motor, the battery being operable in recharge mode when the motor operates as the generator; a hybrid control module that is operable to determine different requests on the motor in response to varying operating conditions of the vehicle; to determine torque application/absorption commands in response to the different requests; to determine various output and input margins, and various periods of time with the different requests; to determine discharge and recharge clearances in response to the determined various output and input margins; to estimate an actual state of charge (SOC) of the battery; to determine a discharge limit and a recharge limit in response to the estimated actual SOC of the battery; to determine a discharge allowance from the determined discharge limit and the determined discharge clearance; to determine a recharge allowance from the determined recharge limit and the determined recharge clearance; to use the determined period of time, discharge allowance and recharge allowance as limits that are imposed on the torque application/absorption commands to generate the motor commands; and to apply the motor commands to the motor. - View Dependent Claims (20)
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Specification