Apparatus and method for controlling an accelerator for electric vehicles
First Claim
1. A method for controlling an accelerator for an electric vehicle having a motor, an accelerator pedal depth sensor, and a vehicle speed sensor, the method comprising the steps of:
- a) determining an actual accelerator pedal depth value (Gain) based on output from the accelerator pedal depth sensor, and determining a current vehicle speed (V) based on output from the vehicle speed sensor;
b) determining a maximum output torque (Tm) of the motor based on a current vehicle speed (V);
c) controlling the output torque (T) of the motor according to a formula T=Tm*ƒ
(Gain);
wherein application of the formula T=Tm*ƒ
(Gain) governs the output torque (T) such that;
during a first period of time, a growth rate of the output torque (T) is greater than a growth rate of the actual accelerator pedal depth value (Gain); and
wherein during a second period of time, a growth rate of the output torque (T) approximates the growth rate of the actual accelerator pedal depth value (Gain).
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Abstract
The present invention provides an apparatus and method for controlling an accelerator for electric vehicles. The method comprises steps of: acquiring an actual accelerator pedal depth value and a current vehicle speed; determining a maximum output torque of motor under the current vehicle speed based on the current vehicle speed; and controlling the output torque of motor in such a way that the growth rate of the output torque higher than that of the actual accelerator pedal depth value at the beginning and then closed to that of the actual accelerator pedal depth value during the actual accelerator pedal depth value growing. The invention makes the output torque grown rapidly within the shallow range of accelerator pedal depth, while makes the output torque grown closed to that of the accelerator pedal depth within the relative deep range of accelerator pedal depth. Thus during the initial stage of acceleration, the vehicle may rapidly output a bigger torque, with an excellent dynamic response, to improve the driving comfort.
30 Citations
13 Claims
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1. A method for controlling an accelerator for an electric vehicle having a motor, an accelerator pedal depth sensor, and a vehicle speed sensor, the method comprising the steps of:
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a) determining an actual accelerator pedal depth value (Gain) based on output from the accelerator pedal depth sensor, and determining a current vehicle speed (V) based on output from the vehicle speed sensor; b) determining a maximum output torque (Tm) of the motor based on a current vehicle speed (V); c) controlling the output torque (T) of the motor according to a formula T=Tm*ƒ
(Gain);wherein application of the formula T=Tm*ƒ
(Gain) governs the output torque (T) such that;during a first period of time, a growth rate of the output torque (T) is greater than a growth rate of the actual accelerator pedal depth value (Gain); and wherein during a second period of time, a growth rate of the output torque (T) approximates the growth rate of the actual accelerator pedal depth value (Gain). - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for controlling an accelerator for an electric vehicle having a motor, an accelerator pedal, an accelerator pedal depth sensor, and a speed sensor, the apparatus comprising:
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a motor controller configured to control the motor; the speed sensor configured to detect a current vehicle speed of the vehicle and output a vehicle speed signal to the motor controller; the accelerator pedal depth sensor configured to detect a depth of travel of the accelerator pedal, and output an accelerator pedal depth signal to the motor controller; and wherein the motor controller is configured to; receive the vehicle speed signal and the accelerator pedal depth signal; determine a current vehicle speed (V) based on the vehicle speed signal; determine an actual accelerator pedal depth value (Gain) based on the accelerator pedal depth signal; determine a maximum output torque (Tm) of the motor based on the current vehicle speed (V); calculate an output torque (T) configured to control the motor according to a formula T=Tm*ƒ
(Gain);output a torque control signal to control the motor corresponding to the calculated output torque (T); and wherein application of the formula T=Tm*ƒ
(Gain) governs the output torque (T) of the motor such that;during a first period of time, a growth rate of the output torque (T) is greater than a growth rate of that the actual accelerator pedal depth value (Gain); and during a second period of time, the growth rate of the output torque (T) approximates the growth rate of the actual accelerator pedal depth value (Gain). - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification