Travel controller for work vehicle
First Claim
1. A work vehicle comprising:
- a travel body comprising wheels on its front and rear, and right and left sides, of which wheels, a front pair or a rear pair of right and left wheels are drive wheels;
a steering actuator, which drives a link mechanism that directs said pair of right and left drive wheels, and thereby changes steering angles at said drive wheels;
two induction motors, which independently drive said pair of right and left drive wheels, respectively;
a battery, which is used for supplying electric power to said two induction motors;
an inverter, which converts DC power from said battery to AC power and supplies the AC power to said two induction motors for driving both said two induction motors to rotate;
travel-operating means, which is operated for travel control of said travel body;
steering-operating means, which is operated to set a turning direction for said travel body;
steering-controlling means, which controls operation of said steering actuator such that the steering angles at said drive wheels correspond to operation of said steering-operating means;
inverter-controlling means, which controls operation of said inverter to rotate said induction motors at a speed that corresponds to the operation of said travel-operating means; and
steering-angle-detecting means, which detects the steering angles at said drive wheels, whereinwhen a steering is detected by said steering-angle-detecting means, said inverter-controlling means controls the operation of said induction motors through said inverter such that said motors acquire a characteristic that their torque output changes more gradually than otherwise over a corresponding rotational speed change.
1 Assignment
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Accused Products
Abstract
A vehicle 1 used for work at elevated locations comprises a travel body 10, whose front wheels 11a, 11b are drive wheels, a steering cylinder 17, two travel motors 12, a battery B, an inverter IV, a travel operation lever 41, and a steering dial 42. In the vehicle, the steering cylinder 17 drives a steering mechanism 13, which directs the drive wheels 11a, 11b, to change the steering angle of the drive wheels 11a, 11b, and the travel motors 12a, 12b, which receive electric power from the battery B, respectively, drive the drive wheels 11a, 11b. The inverter IV converts DC power from the battery B to AC power, which is supply to the travel motors 12a, 12b to drive the rotation of both the drive motors. The travel operation lever 41 is operated for travel control while the steering dial 42 is operated to steer the travel body 10. The vehicle further comprises a steering control unit 53 and an inverter control unit 51. The steering control unit 53 controls the operation of the steering cylinder 17, so that the steering angle of the drive wheels corresponds to the operation of the steering dial 42, and the inverter control unit 51 controls the operation of the inverter IV to rotate the travel motors 12a, 12b at a speed that corresponds to the operation of the travel operation lever 41.
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Citations
16 Claims
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1. A work vehicle comprising:
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a travel body comprising wheels on its front and rear, and right and left sides, of which wheels, a front pair or a rear pair of right and left wheels are drive wheels; a steering actuator, which drives a link mechanism that directs said pair of right and left drive wheels, and thereby changes steering angles at said drive wheels; two induction motors, which independently drive said pair of right and left drive wheels, respectively; a battery, which is used for supplying electric power to said two induction motors; an inverter, which converts DC power from said battery to AC power and supplies the AC power to said two induction motors for driving both said two induction motors to rotate; travel-operating means, which is operated for travel control of said travel body; steering-operating means, which is operated to set a turning direction for said travel body; steering-controlling means, which controls operation of said steering actuator such that the steering angles at said drive wheels correspond to operation of said steering-operating means; inverter-controlling means, which controls operation of said inverter to rotate said induction motors at a speed that corresponds to the operation of said travel-operating means; and steering-angle-detecting means, which detects the steering angles at said drive wheels, wherein when a steering is detected by said steering-angle-detecting means, said inverter-controlling means controls the operation of said induction motors through said inverter such that said motors acquire a characteristic that their torque output changes more gradually than otherwise over a corresponding rotational speed change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification