Abstract: In a control apparatus of a walk-behind electric lawn mower equipped with an electric motor, a blade cutter connected to the electric motor, a rechargeable battery connected to the electric motor, a motor driver circuit to adjust supply of operating electric power to the electric motor, ON/OFF of a first switching element disposed in a current path connecting the battery and the electric motor and a second switching element interposed in the current path in series with a braking resistor to allow charge current from the electric motor to the braking resistor, wherein operation of the first and second switching elements are controlled based on detected battery temperature and internal voltage of the motor driver circuit.

Abstract: An apparatus for controlling operation of a walk-behind electric lawn mower equipped with an electric motor, a blade cutter connected to the electric motor and a rechargeable battery mounted connected to the electric motor and a motor driver circuit. In the apparatus, when an instruction to stop the electric motor is inputted, the operation of the motor driver circuit is controlled to output regenerative electric current from three-phase coils of the electric motor. At that time, it is determined whether a rotational speed of the electric motor is equal to or less than a switching rotational speed and when it is, the motor driver circuit is controlled to switch from the regenerative braking to short-circuit braking that short-circuits the three-phase coils of the electric motor.

Abstract: In a control apparatus of a walk-behind electric lawn mower equipped with an electric motor, a blade cutter connected to the electric motor, a rechargeable battery connected to the electric motor, a motor driver circuit to adjust supply of operating electric power to the electric motor, ON/OFF of a first switching element disposed in a current path connecting the battery and the electric motor and a second switching element interposed in the current path in series with a braking resistor to allow charge current from the electric motor to the braking resistor, wherein operation of the first and second switching elements are controlled based on detected battery temperature and internal voltage of the motor driver circuit.

Abstract: An apparatus for controlling operation of a walk-behind electric lawn mower equipped with an electric motor, a blade cutter connected to the electric motor and a rechargeable battery mounted connected to the electric motor and a motor driver circuit. In the apparatus, when an instruction to stop the electric motor is inputted, the operation of the motor driver circuit is controlled to output regenerative electric current from three-phase coils of the electric motor. At that time, it is determined whether a rotational speed of the electric motor is equal to or less than a switching rotational speed and when it is, the motor driver circuit is controlled to switch from the regenerative braking to short-circuit braking that short-circuits the three-phase coils of the electric motor.

Abstract: Disclosed is a snow removal machine capable of adjusting a snow throwing direction of a snow throwing section by means of a snow throwing drive section, which comprises: a snow throwing direction sensor for detecting a snow throwing direction of the snow throwing section; a snow removal machine inclination angle sensor for detecting an inclination angle of the snow removal machine or the snow throwing section relative to a horizontal surface; and a control section that controls the snow throwing drive section to adjust the snow throwing direction of the snow throwing section based on respective detection values of the snow throwing direction detected by the snow throwing direction sensor and the inclination angle detected by the snow removal machine inclination angle sensor.

Abstract: Disclosed is a snow removal machine capable of adjusting a snow throwing direction of a snow throwing section by means of a snow throwing drive section, which comprises: a snow throwing direction sensor for detecting a snow throwing direction of the snow throwing section; a snow removal machine inclination angle sensor for detecting an inclination angle of the snow removal machine or the snow throwing section relative to a horizontal surface; and a control section that controls the snow throwing drive section to adjust the snow throwing direction of the snow throwing section based on respective detection values of the snow throwing direction detected by the snow throwing direction sensor and the inclination angle detected by the snow removal machine inclination angle sensor.

Abstract: A snow plow including a control unit for controlling the raising and lowering of an auger housing, a reset switch that can be operated by a worker, and a reset display light that illuminates in conjunction with the turning on of the reset switch. The control unit automatically raises and lowers the auger housing in accordance with the reverse and forward traveling of travel device, and automatically adjusts the auger housing to a horizontal position during forward travel of the travel device upon receiving an on signal from the reset switch. The control unit maintains the illuminated state of the illuminated reset display light according to the turning on of the reset switch, even when the travel device is traveling in reverse, and extinguishes the reset display light upon receiving a termination signal for terminating snow plowing work performed with an auger.

Abstract: A rising temperature of components of an electric generator is restrained without deteriorating the quality of electricity output and the user-friendliness of the electric generator. AVR (7) and a temperature detecting means (75) is provided in a generator housing. While the detected temperature is greater than the limitation starting temperature, the output voltage is decreased by decreasing the control target value (for the AVR (7)) in accordance with the temperature. A range between the power generation stopping temperature as an upper-limit temperature of a generator component and the limitation starting temperature set to be a lower than the power generation stopping temperature is defined as a voltage droop range. In the voltage droop range, the control target value is decreased in accordance with a target voltage base value preset in a relationship with the temperature so that the decrease degree becomes greater in proportion to a rising temperature.

Abstract: A snow plow includes a control unit for controlling a raising/lowering drive mechanism so that an auger housing becomes horizontal, a relative angle detection unit for detecting the angle of the auger housing relative to a travel frame, and a horizontal detection unit for detecting the horizontal state of the auger housing. The control unit stops the raising/lowering drive mechanism when the control unit assess that either a first condition or a second condition is satisfied, the first condition being that the relative angle be zero and the second condition being that the auger housing be horizontal.

Abstract: A snow plow includes a control unit for raising an auger housing to a predetermined upper limit angle when travel device is reversing, and an acceleration sensor for detecting acceleration produced in the auger housing. The control unit determines an angle of inclination of the auger housing on the basis of the acceleration. When the travel device starts moving forward after having temporarily moved in reverse, the control unit sets an intermediate lowering target angle of inclination, which is in the lowering path of the auger housing from the upper limit angle to a pre-reversing angle of inclination, in accordance with the forward acceleration; lowers the auger housing at a given lowering speed from the upper limit angle to the intermediate lowering target angle of inclination; and lowers the auger housing at a gradually decreasing lowering speed from the intermediate lowering target angle of inclination to the pre-reversing angle of inclination.

Abstract: A snow plow includes a control unit for raising an auger housing to a predetermined upper limit angle when travel device is reversing, and an acceleration sensor for detecting acceleration produced in the auger housing. The control unit determines an angle of inclination of the auger housing on the basis of the acceleration. When the travel device starts moving forward after having temporarily moved in reverse, the control unit sets an intermediate lowering target angle of inclination, which is in the lowering path of the auger housing from the upper limit angle to a pre-reversing angle of inclination, in accordance with the forward acceleration; lowers the auger housing at a given lowering speed from the upper limit angle to the intermediate lowering target angle of inclination; and lowers the auger housing at a gradually decreasing lowering speed from the intermediate lowering target angle of inclination to the pre-reversing angle of inclination.

Abstract: A snow plow including a control unit for controlling the raising and lowering of an auger housing, a reset switch that can be operated by a worker, and a reset display light that illuminates in conjunction with the turning on of the reset switch. The control unit automatically raises and lowers the auger housing in accordance with the reverse and forward traveling of travel device, and automatically adjusts the auger housing to a horizontal position during forward travel of the travel device upon receiving an on signal from the reset switch. The control unit maintains the illuminated state of the illuminated reset display light according to the turning on of the reset switch, even when the travel device is traveling in reverse, and extinguishes the reset display light upon receiving a termination signal for terminating snow plowing work performed with an auger.

Abstract: A snow plow includes a control unit for controlling a raising/lowering drive mechanism so that an auger housing becomes horizontal, a relative angle detection unit for detecting the angle of the auger housing relative to a travel frame, and a horizontal detection unit for detecting the horizontal state of the auger housing. The control unit stops the raising/lowering drive mechanism when the control unit assess that either a first condition or a second condition is satisfied, the first condition being that the relative angle be zero and the second condition being that the auger housing be horizontal.

Abstract: A rising temperature of components of an electric generator is restrained without deteriorating the quality of electricity output and the user-friendliness of the electric generator. AVR (7) and a temperature detecting means (75) is provided in a generator housing. While the detected temperature is greater than the limitation starting temperature, the output voltage is decreased by decreasing the control target value (for the AVR (7)) in accordance with the temperature. A range between the power generation stopping temperature as an upper-limit temperature of a generator component and the limitation starting temperature set to be a lower than the power generation stopping temperature is defined as a voltage droop range. In the voltage droop range, the control target value is decreased in accordance with a target voltage base value preset in a relationship with the temperature so that the decrease degree becomes greater in proportion to a rising temperature.

Abstract: In a cycloconverter generator, there are provided, q number of power circuits that supply rectified DC power of a DC power supply unit as operating power to the p(p>q) number of thyristors, and r(p>r) number of thyristor drive circuits that are connected to the q number of the power circuits and drive the p number of the thyristors, wherein the r number of the thyristors drive circuits are individually used to drive in common ones among the p number of the thyristors whose operation is unaffected even if driven at the same timing such that the number r of the drive circuits is made smaller than the number p of the thyristors, thereby enabling to simplify circuit configuration.

Abstract: In a cycloconverter generator, AC power required by the load is detected and a desired speed of the engine is determined based on the required AC power, operation of an actuator is controlled such that the engine speed becomes equal to the desired engine speed, and the required AC power is generated by turning on switching elements (thyristors) such that a number of the phase signal within one period of frequency of the AC power, becomes equal to a number determined by the desired engine speed, thereby preventing undesirable increase in fuel consumption and noise by operating the engine at a speed corresponding to required AC power and enabling to generate stable AC power even when the engine speed changes abruptly.

Abstract: In an apparatus for controlling a small boat having a hull and two outboard motors mounted on a stern of the hull and an actuator adapted to open/close a throttle valve of each engine of the motors for regulating speed of the engine, acceleration acting on the boat in a direction of gravity axis when the boat ascends or descends the ocean wave and angular acceleration about the gravity is detected and a correction amount of the engine speed is calculated based on the detected acceleration so as to change behavior of the boat, thereby mitigating a burden on the operator and improving stability of the boat.

Abstract: In a cycloconverter generator equipped with an AC power generator that generates single-phase AC power to be supplied to a load by turning on positive and negative switching elements at variable timing every half-period of a desired AC power frequency based on a phase signal and a DC power generator that generates DC power by turning on the positive switching elements in accordance with a timing determined by desired DC voltage, there is installed with a selection switch that is installed to be operable by an user and produces an output indicative of a result of the user's selection between the AC power and DC power thereby enabling to the user to easily select either one of alternating current and direct current.

Abstract: In an apparatus for controlling a small boat having a hull and two outboard motors mounted on a stem of the hull and an actuator adapted to open/close a throttle valve of each engine of the motors for regulating speed of the engine, acceleration acting on the boat in a direction of gravity axis when the boat ascends or descends the ocean wave and angular acceleration about the gravity is detected and a correction amount of the engine speed is calculated based on the detected acceleration so as to change behavior of the boat, thereby mitigating a burden on the operator and improving stability of the boat.

Abstract: In a cycloconverter generator equipped with an AC power generator that generates single-phase AC power to be supplied to a load by turning on positive and negative switching elements at variable timing every half-period of a desired AC power frequency based on a phase signal and a DC power generator that generates DC power by turning on the positive switching elements in accordance with a timing determined by desired DC voltage, there is installed with a selection switch that is installed to be operable by an user and produces an output indicative of a result of the user's selection between the AC power and DC power thereby enabling to the user to easily select either one of alternating current and direct current.