Method for regulating the state of charge of an energy accumulator in a vehicle having a hybrid drive unit
First Claim
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1. A method for regulating a state of charge of an energy accumulator for storing electrical energy in a vehicle having a hybrid drive unit, an internal combustion engine and at least one electrical machine which can be coupled to a power train of the vehicle, comprising:
- regulating the state of charge of the energy accumulator as a function of a velocity of the vehicle; and
lowering a setpoint value of the state of charge by a value that corresponds to a likely charge to be received by the energy accumulator during a deceleration of the vehicle from an instantaneous velocity to a standstill;
wherein the value that corresponds to a likely charge to be received is obtained by accessing a predefined characteristic curve that predicts the value that corresponds to a likely charge to be received as a function of velocity.
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Abstract
A method for regulating the state of charge of an energy accumulator in a vehicle having a hybrid drive unit, a motor vehicle in particular, including an internal combustion engine and at least one electrical machine which can be coupled or are coupled to a power train of the vehicle. It is provided that a state of charge of the energy accumulator is regulated by a charge controller as a function of the vehicle'"'"'s velocity.
74 Citations
22 Claims
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1. A method for regulating a state of charge of an energy accumulator for storing electrical energy in a vehicle having a hybrid drive unit, an internal combustion engine and at least one electrical machine which can be coupled to a power train of the vehicle, comprising:
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regulating the state of charge of the energy accumulator as a function of a velocity of the vehicle; and lowering a setpoint value of the state of charge by a value that corresponds to a likely charge to be received by the energy accumulator during a deceleration of the vehicle from an instantaneous velocity to a standstill; wherein the value that corresponds to a likely charge to be received is obtained by accessing a predefined characteristic curve that predicts the value that corresponds to a likely charge to be received as a function of velocity. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14, 15)
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6. A vehicle, comprising:
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a hybrid drive unit; a power train; an internal combustion engine; at least one electrical machine that can be coupled to the power train of the vehicle; an energy accumulator for storing electrical energy; and a charge controller for regulating a state of charge of the energy accumulator, wherein the charge controller; regulates the state of charge of the energy accumulator as a function of a velocity of the vehicle; and lowers a setpoint value of the state of charge by a value that corresponds to a likely charge to be received by the energy accumulator during a deceleration of the vehicle from an instantaneous velocity to a standstill; wherein the value that corresponds to a likely charge to be received is obtained by accessing a predefined characteristic curve that predicts the value that corresponds to a likely charge to be received as a function of velocity. - View Dependent Claims (7, 8, 9, 16, 17, 18, 19, 20, 21)
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22. A method for regulating a state of charge of an energy accumulator for storing electrical energy in a vehicle having a hybrid drive unit, an internal combustion engine and at least one electrical machine which can be coupled to a power train of the vehicle, comprising:
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calculating, for various values of instantaneous velocity, a likely amount of charge to be received by the energy accumulator during a deceleration of the vehicle from the instantaneous velocity to a standstill; generating a first characteristic curve in which a setpoint value of the state of charge of the energy accumulator is lowered, as a function of the instantaneous velocity, by the calculated likely amount of charge, wherein the setpoint value decreases in proportion to the square of the instantaneous velocity in a predefined velocity range between the standstill and an upper limit, and is then kept constant; generating a second characteristic curve in which the setpoint value is kept constant up to a predefined minimum velocity, then drops with a curved trajectory of increasing slope until a maximum velocity is reached, and is then kept constant; providing a charge controller with access to the first and the second characteristic curves; configuring the charge controller to regulate the state of charge of the energy accumulator in accordance with the second characteristic map when the vehicle is operating from a cold start, and in accordance with the first characteristic map at all other times; and further configuring the charge controller to provide an exception to control in accordance with the first characteristic map, the exception being that the setpoint value is not lowered when energy for charging the energy accumulator is generated via energy recovery during a downhill drive, in which case the charge controller stores surplus energy in the energy accumulator independently from the velocity.
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Specification