D. PWM control principle
In the EMB system, the key of achieving brake is that,
according to the pedal brake signals, ECU can control the
motor to produce the corresponding braking torque, so as to
make the EMB output the corresponding brake power. The
brake pedal model receives the driver’s commands via
angular speed sensor, and converts it into digital signals to
ECU. ECU converts the digital signals into the braking
signal of the brushless DC motor. Then according to the
three-phase rotor position signals, current signals and the
torque feedback signals and so on, ECU analysis and
processes the braking signal to control the torque and
turning of the motor.ECU is a core part of motor control. To
adjust speed, the ECU changes the average voltage of the
brushless DC motor through adjusting the PWM duty cycle,
using PWM pulse width modulation.
The average voltage of the motor armature windings can
be expressed as follows:
D. PWM control principleIn the EMB system, the key of achieving brake is that,according to the pedal brake signals, ECU can control themotor to produce the corresponding braking torque, so as tomake the EMB output the corresponding brake power. Thebrake pedal model receives the driver’s commands viaangular speed sensor, and converts it into digital signals toECU. ECU converts the digital signals into the brakingsignal of the brushless DC motor. Then according to thethree-phase rotor position signals, current signals and thetorque feedback signals and so on, ECU analysis andprocesses the braking signal to control the torque andturning of the motor.ECU is a core part of motor control. Toadjust speed, the ECU changes the average voltage of thebrushless DC motor through adjusting the PWM duty cycle,using PWM pulse width modulation.The average voltage of the motor armature windings canbe expressed as follows:
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