Back to results
US 7,411,368 B2Granted
Electric motor speed controller for vehicle
AssigneesMatsushita Electric Industrial Co., Ltd., Panasonic Semiconductor Asia Pte., Ltd.
InventorsTien Yew Kang, Kian Teck Teo, Yubin Liu
Life of this patent
Estimating the term…
Abstract
An electric motor speed controller for use in a bicycle includes a motor to provide a propulsion force to move the bicycle. The actual motor speed and a target motor speed are compared, and if the actual motor speed is lower, more current is supplied to the motor, and if the actual motor speed is higher, less current is supplied to the motor.
Claims11
An electric motor speed controller for a vehicle, comprising:
- a motor operable to provide a propulsion force to move the vehicle;
- a position sensor provided on the motor to produce position information of the motor;
- a motor speed counter operable to produce an actual motor speed signal;
- a motor power driver operable to deliver electric power to the motor and to produce a drive current signal;
- a pulse width modulation logic controller operable to control the motor power driver based on the position information and a pulse width modulation command signal;
- an analog comparator operable to compare the drive current signal with a drive control signal and to produce the pulse width modulation command signal;
- an input voltage setting device operable to produce a target motor speed signal;
- an analog comparator operable to compare the actual motor speed signal with the target motor speed signal and to produce a comparison result;
- and
- an up/down counter operable to increase or decrease a number of counts based on the comparison result, and to produce the drive control signal.
7 more elements
An electric motor speed controller for a vehicle, comprising:
- a motor operable to provide a propulsion force to move the vehicle;
- a position sensor provided on the motor to produce position information of the motor;
- a motor speed counter operable to produce an actual motor speed signal;
- a motor power driver operable to deliver electric power to the motor and to produce a drive current signal;
- a pulse width modulation logic controller operable to control the motor power driver based on the position information and a pulse width modulation command signal;
- an analog comparator operable to compare the drive current signal with a drive control signal and to produce the pulse width modulation command signal;
- an up/down counter operable to increase or decrease a number of counts based on a comparison result, and to produce the drive control signal;
- a cruise mode select block operable to produce a cruise mode select signal;
- a latch switch operable to turn on instantaneously in response to a starting edge of the cruise mode select signal;
- a latching register operable to latch the actual motor speed signal in response to the turn on of the latch switch;
- and
- a digital comparator operable to compare the latched motor speed signal from the latching register with the actual motor speed signal from the motor speed counter and to produce a speed comparison result.
9 more elements
An electric motor speed control method for controlling a vehicle having a motor operable to provide a propulsion force to move the vehicle, the method comprising:
- producing position information of the motor;
- producing an actual motor speed signal;
- delivering electric power to the motor and producing a drive current signal;
- controlling the motor based on the position information and a pulse width modulation command signal;
- comparing the drive current signal with a drive control signal and producing the pulse width modulation command signal;
- producing a target motor speed signal;
- analog-comparing the actual motor speed signal with the target motor speed signal to produce a comparison result;
- and
- increasing or decreasing the level of the drive control signal based on the comparison result, and producing the drive control signal.
6 more elements
An electric motor speed control method for controlling a vehicle a motor operable to provide a propulsion force to move the vehicle, the method comprising:
- producing position information of the motor;
- producing an actual motor speed signal;
- delivering electric power to the motor and producing a drive current signal;
- controlling the motor based on the position information and a pulse width modulation command signal;
- comparing the drive current signal with a drive control signal and producing the pulse width modulation command signal;
- producing a cruise mode select signal;
- turning on instantaneously in response to a starting edge of the cruise mode select signal;
- latching the actual motor speed signal in response to the turning on;
- comparing the latched motor speed signal from the latching register with the motor speed signal from the motor speed counter to produce a speed comparison result;
- and
- increasing or decreasing the level of the drive control signal based on the speed comparison result, and producing the drive control signal.
8 more elements
Dependencies are inferred from the claim text.