초록 ▼

An electric control is disclosed for an electrically powered vehicle having independently controlled left and right drive motors and associated drive wheels to propel and steer the vehicle. The electrical control includes left and right closed loop control circuits for respectively accelerating eith

An electric control is disclosed for an electrically powered vehicle having independently controlled left and right drive motors and associated drive wheels to propel and steer the vehicle. The electrical control includes left and right closed loop control circuits for respectively accelerating either or both of the drive wheels whenever a speed command or error signal associated with such drive wheel exceeds a first determined value. Dynamic braking is provided by connecting in parallel electrical relationship an associated brake resistor across one or both of the motors whenever the speed command signal associated with such motor does not exceed a second predetermined value.

대표청구항 ▼

An electrically powered vehicle having a differential drive and steering system comprising right and left drive wheel assemblies which each include a direct current motor operably connected to a drive wheel, a source of electric power for providing a power signal to each of said motors, manually adj

An electrically powered vehicle having a differential drive and steering system comprising right and left drive wheel assemblies which each include a direct current motor operably connected to a drive wheel, a source of electric power for providing a power signal to each of said motors, manually adjustable means for providing electrical control signals indicative of desired drive wheel speeds, means for providing feedback signals indicative of actual drive wheel speeds, and an electrical control circuit including a closed loop control circuit to provide a speed command signal proportional in magnitude to differences between said control and feedback signals, a motor energizing network to vary the power signal to said motor in proportion with the magnitude of said speed command signal at values thereof in excess of a first predetermined value, and a dynamic brake network including brake means operable to decelerate each of said motors together with its associated drive wheel in response to speed command signals lower in value than a second predetermined value, said dynamic brake network including power signal modulator means for varying said power signal in accordance with the magnitude of said speed command signal, said power signal modulator means including energizing switch means operable to electrically connect and disconnect said source of electric power from said motor, said power signal modulator means also including a source for providing a fixed frequency and amplitude reference signal which is compared with said speed command signal to provide a power modulating control signal which is proportional to said speed command signal.