Abstract: A drive unit usable in an electrically assisted wheelchair includes a controller to acquire an output signal from a torque sensor and an output signal from a speed sensor; measure a time period in which a first state, where the output signal from the torque sensor indicates that a forward-direction torque applied to a hand rim has a value no smaller than a first predetermined value, continues; and when the measured time period is a first time period or longer, start control of an electric motor in a cruise control mode by which the electrically assisted wheelchair runs while keeping a running speed at a target speed.

Abstract: A power assist wheelchair includes a wheel, an electric motor that drives the wheel, an encoder that detects rotation of the electric motor, and a control device that controls the electric motor. The control device includes a total torque value calculator that calculates a total torque value based upon only a detection signal of the encoder, an assist torque value calculator that calculates an assist torque value based upon an output current of the electric motor, a manual torque value calculator that calculates a manual torque value based upon a difference obtained by subtracting the assist torque value from the total torque value, and a target current determiner that determines a target current of the electric motor based upon the manual torque value.

Abstract: A control device for a power assist wheelchair which includes a compensation turning torque calculation unit that calculates a compensation turning torque value for compensating for at least a part of the shortage or excess of the actual turning torque value with respect to the predicted turning torque value, in which the compensation turning torque value is smaller when the vehicle speed is a first speed than when the vehicle speed is a second speed faster than the first speed; a first target current determination unit that determines a target current of the first electric motor based upon the first manual torque value and the compensation turning torque value; and a second target current determination unit that determines a target current of the second electric motor based upon the second manual torque value and the compensation turning torque value.

Abstract: A power assist wheelchair includes a wheel, an electric motor that drives the wheel, an encoder that detects rotation of the electric motor, and a control device that controls the electric motor. The control device includes a total torque value calculator that calculates a total torque value based upon only a detection signal of the encoder, an assist torque value calculator that calculates an assist torque value based upon an output current of the electric motor, a manual torque value calculator that calculates a manual torque value based upon a difference obtained by subtracting the assist torque value from the total torque value, and a target current determiner that determines a target current of the electric motor based upon the manual torque value.

Abstract: A control device for a power assist wheelchair which includes a compensation turning torque calculation unit that calculates a compensation turning torque value for compensating for at least a part of the shortage or excess of the actual turning torque value with respect to the predicted turning torque value, in which the compensation turning torque value is smaller when the vehicle speed is a first speed than when the vehicle speed is a second speed faster than the first speed; a first target current determination unit that determines a target current of the first electric motor based upon the first manual torque value and the compensation turning torque value; and a second target current determination unit that determines a target current of the second electric motor based upon the second manual torque value and the compensation turning torque value.

Abstract: It becomes possible to monitor a driven state of each wheel in a wheelchair whose wheels are driven according to output information calculated based on input information. A left wheel controller and a right wheel controller are provided. The presence or absence of a drive abnormality of the left wheel is determined by the right wheel controller receiving first drive related information that is related to a drive of the left wheel and transmitted from the left wheel controller, and the presence or absence of a drive abnormality of the left wheel is determined by the left wheel controller receiving second drive related information that is related to a drive of the right wheel and transmitted from the right wheel controller.

Abstract: It becomes possible to monitor a driven state of each wheel in a wheelchair whose wheels are driven according to output information calculated based on input information. A left wheel controller and a right wheel controller are provided. The presence or absence of a drive abnormality of the left wheel is determined by the right wheel controller receiving first drive related information that is related to a drive of the left wheel and transmitted from the left wheel controller, and the presence or absence of a drive abnormality of the left wheel is determined by the left wheel controller receiving second drive related information that is related to a drive of the right wheel and transmitted from the right wheel controller.

Abstract: A control circuit for a self-excited AC generator including an automatic voltage regulator, a fly-wheel capacitor which is charged normally by part of the generator output during a no-load operation or small-load operation of the generator, a detection circuit which detects a drop of the generator output voltage when said output voltage drops below the predetermined value, and a field current control circuit which operates on the fly-wheel capacitor to discharge the stored electric energy to the field winding of the generator or an exciter equipped with the generator when the detection circuit detects a drop of the generator output voltage. The control circuit provides additionally with the second field current control circuit which supplies a current from the generator output terminal to the field winding through a rectifier when the detection circuit detects a drop of the generator output voltage.