IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0949911
(2004-09-24)
|
우선권정보 |
JP-0367775 (2003-10-28) |
발명자
/ 주소 |
- Wakitani, Tsutomu
- Shimizu, Norikazu
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
11 인용 특허 :
6 |
초록
▼
In a travel control method for an electric vehicle, an accelerator angle is obtained from a position of an accelerator lever. An accelerator percentage is determined in accordance with the accelerator angle. The ON times of first and second brake buttons are read. Brake percentages of first and seco
In a travel control method for an electric vehicle, an accelerator angle is obtained from a position of an accelerator lever. An accelerator percentage is determined in accordance with the accelerator angle. The ON times of first and second brake buttons are read. Brake percentages of first and second brakes are determined in accordance with the ON times of the respective first and second brake buttons. A control value for a first electric motor is determined by correcting the accelerator percentage with a corrected brake percentage of the first brake obtained by applying an influence of the brake percentage of the second brake to the brake percentage of the first brake. A speed of the first electric motor is controlled using the control value of the first electric motor. A control value for a second electric motor is determined by correcting the accelerator percentage with a corrected brake percentage of the second brake obtained by applying an influence of the brake percentage of the first brake to the brake percentage of the second brake. A speed of the second electric motor is controlled using the control value of the second electric motor.
대표청구항
▼
1. A travel control method for an electric vehicle having left and right electric motors for driving respective left and right drive wheels and left and right brakes for regulating driving speeds of the respective left and right drive wheels, the travel control method comprising the steps of:reading
1. A travel control method for an electric vehicle having left and right electric motors for driving respective left and right drive wheels and left and right brakes for regulating driving speeds of the respective left and right drive wheels, the travel control method comprising the steps of:reading in an accelerator angle from a position of an accelerator lever controlled by a driver;determining an accelerator percentage in accordance with the accelerator angle;reading in ON times of left and right brake buttons operated by the driver to operate the respective left and right brakes;determining left and right brake percentages of the respective left and right brakes in accordance with the respective ON times of the left and right brake buttons;determining a left motor control value by correcting the accelerator percentage with a corrected left brake percentage obtained by applying an influence of the right brake percentage to the left brake percentage;controlling the speed of the left electric motor using the left motor control value;determining a right motor control value by correcting the accelerator percentage with a corrected right brake percentage obtained by applying an influence of the left brake percentage to the right brake percentage; andcontrolling the speed of the right electric motor using the right motor control value.2. A travel control method according to claim 1; wherein when the accelerator percentage is represented by ACC %, the left brake percentage is represented by BKL %, the right brake percentage is represented by BKR %, a coefficient of the influence of the brake percentage of one of the left and right electric motors with respect to the brake percentage of the other of the electric motors is represented by p (where p<1), and a maximum value of the electric motor control values is represented by Vmax, then the left brake percentage is (BKL %+p×BKR %×ACC %), the left motor control value TG2L is Vmax×ACC %×{1?(BKL %+p×BKR %×ACC %) }, the corrected right brake percentage is (BKR %+p×BKL %×ACC %), and the right motor control value TG2R is Vmax×ACC %×{1?(BKR %+p×BKL %×ACC %) }.3. A travel control method according to claim 1; wherein when the accelerator percentage is represented by ACC %, the left brake percentage is represented by BKL %, the right brake percentage is represented by BKR %, a coefficient of the influence of the brake percentage of one of the left and right electric motors with respect to the brake percentage of the other of the electric motors is represented by p (where p<1), a correction coefficient for multiplying BKL %×ACC % and BKR %×ACC % by to approximate the left/right brake percentages to second order curves is represented by q, and the maximum value of the electric motor control values is represented by Vmax, then the corrected left brake percentage is (BKL %+p×BKR %×ACC %?q×BKL %×ACC %), the left motor control value TG2L is Vmax×ACC % {1?(BKL %+p×BKR %×ACC %?q×BKL %×ACC %)}, the corrected right brake percentage is (BKR %+p×BKL %×ACC %?q×BKR %×ACC %), and the right motor control value TG2R is Vmax×ACC %×{1?(BKR %+p×BKL %×ACC %?q×BKR %×ACC %)}.4. A travel control method for an electric vehicle, comprising the steps of:providing an electric vehicle having first and second electric motors for driving respective first and second drive wheels, first and second brakes for braking the respective first and second drive wheels, and first and second brake buttons controllable between ON and OFF positions by an operator for controlling the respective first and second brakes;obtaining an accelerator angle from a position of an accelerator lever controlled by the operator;determining an accelerator percentage in accordance with the accelerator angle;obtaining ON times of the first and second brake buttons;determining brake percentages of the first and second brakes in accordance with the ON times of the respective first and second brake buttons;determining a control value for the first electric motor by correcting the accelerator percentage with a corrected brake percentage of the first brake obtained by applying an influence of the brake percentage of the second brake to the brake percentage of the first brake;controlling a speed of the first electric motor using the control value of the first electric motor;determining a control value for the second electric motor by correcting the accelerator percentage with a corrected brake percentage of the second brake obtained by applying an influence of the brake percentage of the first brake to the brake percentage of the second brake; andcontrolling a speed of the second electric motor using the control value of the second electric motor.5. A travel control method according to claim 4; wherein when the accelerator percentage is represented by ACC %, the left brake percentage is represented by BKL %, the right brake percentage is represented by BKR %, a coefficient of the influence of the brake percentage of one of the left and right electric motors with respect to the brake percentage of the other of the electric motors is represented by p (where p<1), and a maximum value of the electric motor control values is represented by Vmax, then the left brake percentage is (BKL %+p×BKR %×ACC %), the left motor control value TG2L is Vmax×ACC %×{1?(BKL %+p×BKR %×ACC %)}, the corrected right brake percentage is (BKR %+p×BKL %×ACC %), and the right motor control value TG2R is Vmax×ACC %×{1?(BKR %+p×BKL %×ACC %)}.6. A travel control method according to claim 4; wherein when the accelerator percentage is represented by ACC %, the left brake percentage is represented by BKL %, the right brake percentage is represented by BKR %, a coefficient of the influence of the brake percentage of one of the left and right electric motors with respect to the brake percentage of the other of the electric motors is represented by p (where p<1), a correction coefficient for multiplying BKL %×ACC % and BKR %×ACC % by to approximate the left/right brake percentages to second order curves is represented by q, and the maximum value of the electric motor control values is represented by Vmax, then the corrected left brake percentage is (BKL %+p×BKR %×ACC %?q×BKL %×ACC %), the left motor control value TG2L is Vmax×ACC % {1?(BKL %+p×BKR %×ACC %?q×BKL %×ACC %)}, the corrected right brake percentage is (BKR %+p×BKL %×ACC %?q×BKR %×ACC %), and the right motor control value TG2R is Vmax×ACC %×{1?(BKR %+p×BKL %×ACC %?q×BKR %×ACC %)}.
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