Abstract
A sensorless driving/braking control system for electric vehicles is explained in the present paper. In the proposed system, a field-oriented control (FOC) was used to integrate driving and braking controls in a unified module for reducing the cost of hardware and simultaneously incorporating functional flexibility. An antilock braking system can swiftly halt a vehicle during emergency braking. An electromagnetic reverse braking scheme that provided retarding torque to a running wheel was developed. The scheme could switch the state of the MOSFETs used in the system by alternating the duty cycle of pulse width modulation to adjust the braking current generated by the back electromotive force (EMF) of the motor. In addition, because the braking energy required for the electromagnetic braking scheme is related only to the back EMF, the vehicle operator can control the braking force and safely stop an electric vehicle at high speeds. The proposed integrated sensorless driving and electromagnetic braking system was verified experimentally.
Highlights
In the early 1970s, nonlinear time-varying characteristics of alternating current (AC) motor drives were used for vector control
An Field-oriented control (FOC)-based sensorless driving component was combined with the the same hardware and functionally interact to form a simplified and low-cost architecture, as depicted electromagnetic braking system equipped with antilock braking system (ABS) control
Conclusions driver of the permanent-magnet synchronous motor (PMSM) in a unit were combined was proposed for electric vehicles
Summary
In the early 1970s, nonlinear time-varying characteristics of alternating current (AC) motor drives were used for vector control. To resolve the aforementioned problems, an integrated driving and braking control design based on sensorless FOC technology and incorporating an antilock braking system (ABS) was proposed. The braking effect can be enhanced by intermittently reversing the direction of the magnetic field force from driving to braking using a permanent magnet synchronous motor (PMSM) stator coil To achieve this enhanced braking, the relationship between the rotor angle and brake signal was determined according to a specific function. Combining this function with the aforementioned FOC-based driving mechanism, we can adjust the braking effect according to the parameters of a proportional integral controller. The mathematical model is applicable to brushed DC motors, brushless DC motors, and AC induction motors
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