Abstract: Control section determines necessary acceleration of a transporting section in accordance with an actual transporting speed, and also determines a correction coefficient corresponding to the number of rotations of an engine from among correction coefficients having a characteristic of becoming closer to a value of one as the number of rotations of the engine increases. The control section multiplies the necessary acceleration by the correction coefficient to thereby provide corrected necessary acceleration, and controls rotation of a transporting drive motor in accordance with the corrected necessary acceleration. When the amount of electric power to be generated by a power generator driven by the engine has increased, the control section controls the opening of a throttle valve.

Abstract: A generator apparatus such as in a cogeneration system has a controlling power supply energized with its generator output with giving no adverse effect on the waveform of its output. An inverter 13 is provided for converting an alternating current output of the engine generator 10 into a direct current and returning back by the action of its inverter circuit 133 to an alternating current of a predetermined frequency which is then connected to a power supply system 14. While the engine 11 remains not actuated, a power received from a joint between the inverter 13 and the power supply system 14 is rectified by a rectifier 141 and transferred to the controlling power supply 140. When the engine 11 is started, the power at the input of the inverter circuit 133 is transmitted to the controlling power supply 140.

Abstract: A self-propelled snowplow vehicle includes a vehicle frame equipped with an auger at a front end portion thereof and pivotally connected to a propelling frame equipped with driving wheels, and a frame lift mechanism for lifting the front end portion of the vehicle frame up and down relative to the propelling frame. The frame lift mechanism comprises an electro-hydraulic cylinder actuator having a piston rod and an electric motor rotatably driven to produce a fluid pressure for reciprocating the piston rod in response to operation of a manual operating switch. The snowplow vehicle also includes a control unit arranged to forcibly stop the electric motor when a predetermined time has elapsed after the operation switch is activated, the predetermined time being equal to an operating time of the cylinder actuator which is required to extend or contract the piston rod over a maximum stroke defined between a fully extended position and a fully contracted position of the piston rod.

Abstract: Engine starting performance is enhanced by a brushless motor having no rotor position detecting sensor. In the first place an engine is rotated forward and then is reversely rotated to overcome a high load region of the engine. Then, the engine is accelerated and rotated forward and started. In a light load region of the engine, the engine is immediately accelerated and normally rotated. It is judged whether the region of the engine is the high load region or light load region based on the rotation speed when the starting operation is started. After the starting operation is started, if the forward rotation speed reaches a first speed, and a second speed which is higher than the first speed is obtained even after predetermined time is elapsed, an immediate starting-judging section 36 outputs a detection signal to a starting/normal rotation control section 37.

Abstract: A starter motor is prevented from being rotated together with an engine after the start of a engine. When motor speed exceeds the cranking speed after the start of the engine, a speed judging section 36 judges that the starter motor is rotated together with the engine. A current-supply stopping section 38 commands to stop energizing a motor 3a in response to the judge. After the electricity supply is stopped, if the rotation speed is reduced to a value close to the cranking speed, judging section 36 outputs a signal to cancel the current-supply stopping commands from the current-supply stopping section 38. The detection of the motor speed is also continued even after the ignition, and if the speed is further increased, the speed detection is stopped. If the speed is increased to a value showing complete explosion, the speed judging section 36 switches the relays to a generator.

Abstract: A method of starting an electric brushless rotating machine is provided which enables the rotor to produce a large power of startup torque with no use of any rotor position detectors. At Steps S1 and S2, a first and a second initial magnetization respectively are carried out for shifting the rotor at its free pausing state by forced commutation to a desired location to start the forward rotation at the maximum torque. At Step S3, the energization at single-phase is conducted with the rotor and the stator having a positional relationship for permitting generation of the maximum torque after the forced commutation or the second the initial magnetization. An induced voltage at the not-energized phase is measured by the forced commutation and used for determining the location of the rotor. Step S4 follows where a normal action of the energization is carried out.

Abstract: A method of starting an electric brushless rotating machine is provided where a large startup torque is obtained with no use of any rotor position detecting device and the forced commutation can be switched to normal energization easily and smoothly. At the startup stage, any two of three-phase stator windings are energized for initial magnetization (Steps S1 and S2) to hold the magnetic rotor at a position. Then, the windings of the phases are energized in a sequence while gradually increasing the level of the energization (Step S3). During the forced commutation, the magnetic rotor is rotated by a rotating position detecting signal generated from a voltage signal induced on the not-energized windings to drive the output shaft of an engine. Then, the energization is canceled when the number of revolutions in the internal combustion engine determined from the rotating position detecting signal reaches its predetermined level.

Abstract: An electric vehicle driven by electric motors is provided. The vehicle is switched between forward travel, neutral and reverse travel by a directional speed lever which allows adjustment of the vehicle speed. When the directional speed lever passes through a neutral region at a high speed during forward travel of the vehicle, the vehicle is controlled to shift to normal reverse operation after a lapse of a predetermined period of time since the rotational speed of the electric motors becomes zero, thereby to avoid application of a heavy load to drive circuits for the electric motors.

Abstract: An electric vehicle has left and right speed control levers provided alongside left and right grips provided at the ends of left and right control handles. The electric vehicle also has left and right electric motors for driving left and right driven wheels and left and right brakes for braking the left and right driven wheels. The left brake and the speed of the left electric motor are controlled with the left speed control lever, the right brake and the speed of the right electric motor are controlled with the right speed control lever, and a driver can execute changes of direction and pivot turns and spot turns while holding the vehicle in a good attitude.

Abstract: An electric vehicle driven by at least one electric motor is provided. The vehicle includes a controller for controlling the electric motor and at least one braking device. The controller gradually reduces the rotational speed of the electric motor in accordance with a vehicle drive stop instruction, and operates the braking device when the rotational speed of the electric motor is equal to or lower than a predetermined rotational speed to stop the travel of the vehicle.

Abstract: An electric vehicle driven by a pair of left and right electric motors is provided. The vehicle includes a controller for controlling the start of the vehicle. The controller performs such control as avoiding brake drag caused by the operation of the electric motors before the elimination of the braking of a pair of left and right parking electromagnetic brakes.

Abstract: An electric working machine includes electric motors, a movable speed adjustment lever, a potentiometer for producing a voltage variable in response to the movement of the lever, and a control unit for controlling the electric motors on the basis of the voltage. The lever is movable within a range including a neutral range, a working low speed range, a working middle speed range, and a high speed traveling range.

Abstract: Control section determines necessary acceleration of a transporting section in accordance with an actual transporting speed, and also determines a correction coefficient corresponding to the number of rotations of an engine from among correction coefficients having a characteristic of becoming closer to a value of one as the number of rotations of the engine increases. The control section multiplies the necessary acceleration by the correction coefficient to thereby provide corrected necessary acceleration, and controls rotation of a transporting drive motor in accordance with the corrected necessary acceleration. When the amount of electric power to be generated by a power generator driven by the engine has increased, the control section controls the opening of a throttle valve.

Abstract: Upon satisfaction of three predetermined conditions that 1) a straight-ahead travel instruction has been given, 2) an actual number of motor rotations is less than a target number of motor rotations and 3) a motor control signal produced to bring the actual number of motor rotations closer to the target number of motor rotations has reached a predetermined upper-limit output value, a downward motor-rotation correction process is performed repeatedly to progressively reduce the target number of motor rotations or to reduce the upper-limit output value of the motor control signal until the respective actual numbers of rotations of the left and right motors to substantially coincide with each other.

Abstract: A self-propelled snowplow vehicle includes a vehicle frame equipped with an auger at a front end portion thereof and pivotally connected to a propelling frame equipped with driving wheels, and a frame lift mechanism for lifting the front end portion of the vehicle frame up and down relative to the propelling frame. The frame lift mechanism comprises an electro-hydraulic cylinder actuator having a piston rod and an electric motor rotatably driven to produce a fluid pressure for reciprocating the piston rod in response to operation of a manual operating switch. The snowplow vehicle also includes a control unit arranged to forcibly stop the electric motor when a predetermined time has elapsed after the operation switch is activated, the predetermined time being equal to an operating time of the cylinder actuator which is required to extend or contract the piston rod over a maximum stroke defined between a fully extended position and a fully contracted position of the piston rod.

Abstract: An electric vehicle has left and right speed control levers provided alongside left and right grips provided at the ends of left and right control handles. The electric vehicle also has left and right electric motors for driving left and right driven wheels and left and right brakes for braking the left and right driven wheels. The left brake and the speed of the left electric motor are controlled with the left speed control lever, the right brake and the speed of the right electric motor are controlled with the right speed control lever, and a driver can execute changes of direction and pivot turns and spot turns while holding the vehicle in a good attitude.

Abstract: A motorized vehicle includes left and right electric motors mounted on a vehicle body for independently rotating left and right driving wheels, respectively, at variable speeds, and an actuator for causing the left and right electric motors to rotate simultaneously in opposite directions, thereby ensuring that the vehicle making a turn through a desired angle while staying at the same position. The actuator includes left and right turn control levers respectively mounted to left and right handlebars so as to extend along left and right handgrips. The turn control levers are operationally connected to left and right brakes and the left and right electric motors for causing the simultaneous rotation of the motors in opposite direction based on the position of the turn control levers.

Abstract: A generator apparatus such as in a cogeneration system has a controlling power supply energized with its generator output with giving no adverse effect on the waveform of its output. An inverter 13 is provided for converting an alternating current output of the engine generator 10 into a direct current and returning back by the action of its inverter circuit 133 to an alternating current of a predetermined frequency which is then connected to a power supply system 14. While the engine 11 remains not actuated, a power received from a joint between the inverter 13 and the power supply system 14 is rectified by a rectifier 141 and transferred to the controlling power supply 140. When the engine 11 is started, the power at the input of the inverter circuit 133 is transmitted to the controlling power supply 140.