Apparatus and method for controlling energy feedback for electric vehicle

An apparatus for controlling energy feedback for an electric vehicle having an electric motor and a storage battery, comprising:

• a motor controller;
• an accelerator-pedal position sensor configured to sense a position of an accelerator-pedal, and transmit an accelerator-pedal position signal to the motor controller;
• a brake-pedal position sensor configured to sense a sensing position of a brake-pedal of the vehicle, and transmit a brake-pedal position signal to the motor controller;
• a vehicle speed sensor configured to sense a current speed of the vehicle, and transmit a current vehicle speed signal to the motor controller;
• the motor controller, configured to:
• obtain an accelerator-pedal travel value (Gain), a brake-pedal travel value (Brake_Deep), and a current vehicle speed value (V) based on the accelerator-pedal position signal, the brake-pedal position signal, and the current vehicle speed signal,
• if the brake-pedal travel value (Brake_Deep) is not equal to 0%, calculate a feedback torque (T) based on the current vehicle speed value (V) and the brake-pedal travel value (Brake_Deep), and control an output of the motor based on the calculated feedback torque (T);
• if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is less than or equal to a given feedback value, then calculate the feedback torque (T) based on the current vehicle speed value (V), and control an output of the motor based on the calculated feedback torque (T);
• and
• if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is not less than or equal to the given feedback value, then set the feedback torque (T) equal to 0;
• and
• an inverter connected between the motor and the battery configured to convert mechanical energy generated by the feedback torque (T) into electric energy, and charge the storage battery.

The apparatus of claim 10, wherein the motor controller is further configured to:

• if the brake-pedal travel value (Brake_Deep) is not equal to 0%, calculate the feedback torque (T) according to the following equation:
• T
• =
• {
• 0
• ,
• 
• if
• 
• 
• V
• <
• V
• 0
• ,
• 
• K
• 1
• 
• V
• +
• K
• 2
• 
• Brake_Deep
• ,
• 
• if
• 
• 
• V
• 0
• ≤
• V
• <
• V
• 1
• ,
• K
• 1
• 
• V
• 1
• +
• K
• 2
• 
• Brake_Deep
• ,
• if
• 
• 
• V
• ≥
• V
• 1
• 
• if the brake-pedal travel (Brake_Deep) is equal to 0% and the accelerator-pedal travel value (Gain) is not greater than the given feedback value, calculate the feedback torque (T) according to the following equation:
• T
• =
• {
• 0
• ,
• 
• if
• 
• 
• V
• <
• V
• 0
• ,
• 
• KV
• ,
• 
• if
• 
• 
• V
• 0
• ≤
• V
• <
• V
• 1
• ,
• KV
• 1
• ,
• if
• 
• 
• V
• ≥
• V
• 1
• 
• wherein K and K1 are respectively predetermined proportional coefficients of current vehicle speed, K2 is a predetermined proportional coefficient of brake-pedal travel, V0 is a predetermined minimum feedback vehicle speed, and V1 is a predetermined maximum feedback vehicle speed.

A method for controlling energy feedback for an electric vehicle having an electric motor and a storage battery, comprising the steps of:

• S1) determining an accelerator-pedal travel value (Gain), and a brake-pedal travel value (Brake_Deep);
• S2) determining a current vehicle speed value (V);
• S3) if the brake-pedal travel value (Brake_Deep) is not equal to 0%, calculating a feedback torque (T) based on the current vehicle speed value (V) and the brake-pedal travel value (Brake_Deep), controlling the output of the motor according to the feedback torque (T), and converting mechanical energy generated by the feedback torque (T) into electric energy to charge the storage battery;
• S4) if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is less than or equal to a given feedback value, then calculating the feedback torque (T) based on the current vehicle speed value (V), controlling the output of the motor based on the feedback torque (T), and converting mechanical energy generated by the feedback torque (T) into electric energy to charge the storage battery;
• and
• S5) if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is not less than or equal to a given feedback value, then setting the feedback torque (T) equal to 0.

A computer readable memory or data storage means encoded with data representing a computer program for system for controlling output torque of an electric motor for an electric vehicle, the computer readable memory or data storage means causing a computer to perform the acts of:

• S1) determining an accelerator-pedal travel value (Gain), and a brake-pedal travel value (Brake_Deep);
• S2) determining a current vehicle speed value (V);
• S3) if the brake-pedal travel value (Brake_Deep) is not equal to 0%, calculating a feedback torque (T) based on the current vehicle speed value (V) and the brake-pedal travel value (Brake_Deep), controlling the output of the motor according to the feedback torque (T), and converting mechanical energy generated by the feedback torque (T) into electric energy to charge a storage battery;
• S4) if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is less than or equal to a given feedback value, then calculating the feedback torque (T) based on the current vehicle speed value (V), controlling the output of the motor based on the feedback torque (T), and converting mechanical energy generated by the feedback torque (T) into electric energy to charge the storage battery;
• and
• S5) if the brake-pedal travel value (Brake_Deep) is equal to 0% and if the accelerator-pedal travel value (Gain) is not less than or equal to a given feedback value, then setting the feedback torque (T) equal to 0.