System and method for motor torque control for electric vehicle with transmission
First Claim
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1. A motor torque control method for a vehicle with a transmission comprising:
- determining, by a controller, a power-on up-shift to increase a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle;
determining, by the controller, a target shift time to complete shifting;
determining, by the controller, a target angular acceleration of a motor according to the target shift time;
calculating, by the controller, a maximum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-on up-shift;
determining, by the controller, a smaller value of the calculated maximum target torque and a target driving torque of the motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-on up-shift;
calculating, by the controller, a minimum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-off down-shift; and
determining, by the controller, a larger value of the calculated minimum target torque and the target driving torque of a motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-off down-shift,wherein calculating the maximum motor torque value calculation, further includes;
setting, by the controller, a relational expression of a value obtained by multiplying the inertia moment of the motor and a clutch to be engaged by the angular acceleration of the motor is the same as a value obtained by subtracting the clutch torque of the clutch to be engaged from the motor torque, in power-on up-shift;
setting, by the controller, the value obtained by the multiplying as a constant, with the target angular acceleration as the angular acceleration of the motor which is multiplied to the inertial moment of the motor and the clutch to be engaged in the relational expression; and
determining, by the controller, the value obtained by adding the constant to the clutch torque determined in accordance with the operational profile of the clutch to be engaged, as the maximum torque motor value.
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Abstract
Disclosed herein is a motor control system and method for a vehicle with a transmission comprising for improving the quality of shifting, by improving precision in shifting control with precise and active motor torque control by calculating a maximum and a minimum motor torque in response to determining a power-on up-shift for increasing a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle.
44 Citations
12 Claims
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1. A motor torque control method for a vehicle with a transmission comprising:
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determining, by a controller, a power-on up-shift to increase a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle; determining, by the controller, a target shift time to complete shifting; determining, by the controller, a target angular acceleration of a motor according to the target shift time; calculating, by the controller, a maximum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-on up-shift; determining, by the controller, a smaller value of the calculated maximum target torque and a target driving torque of the motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-on up-shift; calculating, by the controller, a minimum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-off down-shift; and determining, by the controller, a larger value of the calculated minimum target torque and the target driving torque of a motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-off down-shift, wherein calculating the maximum motor torque value calculation, further includes; setting, by the controller, a relational expression of a value obtained by multiplying the inertia moment of the motor and a clutch to be engaged by the angular acceleration of the motor is the same as a value obtained by subtracting the clutch torque of the clutch to be engaged from the motor torque, in power-on up-shift; setting, by the controller, the value obtained by the multiplying as a constant, with the target angular acceleration as the angular acceleration of the motor which is multiplied to the inertial moment of the motor and the clutch to be engaged in the relational expression; and determining, by the controller, the value obtained by adding the constant to the clutch torque determined in accordance with the operational profile of the clutch to be engaged, as the maximum torque motor value. - View Dependent Claims (2, 3, 4)
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5. A motor torque control system for a vehicle with a transmission comprising:
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a controller configured to; determine a power-on up-shift to increase a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of the vehicle; determine a target shift time to complete shifting; determine a target angular acceleration of a motor according to the target shift time; calculate a maximum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-on up-shift; determine a smaller value of the calculated maximum target torque and a target driving torque of the motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-on up-shift; calculate a minimum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-off down-shift; and determine a larger value of the calculated minimum target torque and the target driving torque of a motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-off down-shift, wherein in calculating the maximum motor torque value, the controller is further configured to; set a relational expression of a value obtained by multiplying the inertia moment of the motor and a clutch to be engaged by the angular acceleration of the motor is the same as a value obtained by subtracting the clutch torque of the clutch to be engaged from the motor torque, in power-on up-shift; set the value obtained by the multiplying as a constant, with the target angular acceleration as the angular acceleration of the motor which is multiplied to the inertial moment of the motor and the clutch to be engaged in the relational expression; and determine the value obtained by adding the constant to the clutch torque determined in accordance with the operational profile of the clutch to be engaged, as the maximum torque motor value. - View Dependent Claims (6, 7, 8)
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9. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:
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program instructions that determine a power-on up-shift to increase a shifting gear and a power-off down-shift for decreasing the shifting gear in shifting of a vehicle; program instructions that determine a target shift time to complete shifting; program instructions that determine a target angular acceleration of a motor according to the target shift time; program instructions that calculate a maximum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-on up-shift; program instructions that determine a smaller value of the calculated maximum target torque and a target driving torque of the motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-on up-shift; program instructions that calculate a minimum motor torque of the motor to operate in shifting, using the target angular acceleration, in response to determining the power-off down-shift; program instructions that determine a larger value of the calculated minimum target torque and the target driving torque of a motor at the beginning of shifting, as motor output torque to be output by the motor in shifting, in response to determining the power-off down-shift; and program instructions that set a relational expression of a value obtained by multiplying the inertia moment of the motor and a clutch to be engaged by the angular acceleration of the motor is the same as a value obtained by subtracting the clutch torque of the clutch to be engaged from the motor torque, in power-on up-shift; program instructions that set the value obtained by the multiplying as a constant, with the target angular acceleration as the angular acceleration of the motor which is multiplied to the inertial moment of the motor and the clutch to be engaged in the relational expression; and program instructions that determine the value obtained by adding the constant to the clutch torque determined in accordance with the operational profile of the clutch to be engaged, as the maximum torque motor value. - View Dependent Claims (10, 11, 12)
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Specification