초록 ▼

In a system for spreading material from a vehicle, the ground speed of the vehicle is sensed by a low torque transducer which generates a train of electrical pulses or digital signal having a repetition rate representative of the vehicle\s ground speed. The digital signal energizes a stepper motor.

In a system for spreading material from a vehicle, the ground speed of the vehicle is sensed by a low torque transducer which generates a train of electrical pulses or digital signal having a repetition rate representative of the vehicle\s ground speed. The digital signal energizes a stepper motor. The shaft of the stepper motor is coupled to a mechanical comparator which is also responsive to the speed of a conveyor, which delivers the material to be spread, for controlling the conveyor drive motor so that the speed of the conveyor tracks the ground speed of the vehicle even at very low speeds. Proportioning of the ground speed signals is accomplished electronically by a digital counter circuit. Override of the ground speed control signal is actuated by the operator. The override may require continued operator actuation; or the override, once actuated may last for a predetermined time or a predetermined distance travelled by the vehicle. In the latter two cases, the time and distance may be adjusted.

대표청구항 ▼

In a control system for a vehicular spreader having a source of material to be spread, distribution means, delivery means for delivering material from said source to said distribution means and power means for actuating said delivery means, the improvement comprising: low-torque transducer means sen

In a control system for a vehicular spreader having a source of material to be spread, distribution means, delivery means for delivering material from said source to said distribution means and power means for actuating said delivery means, the improvement comprising: low-torque transducer means sensing the ground speed of said vehicle for generating a train of electrical pulses having a repetition rate representative of the ground speed of said vehicle; stepper motor means actuated by said train of electrical pulses; comparator means responsive to the angular velocity of said stepper motor means and said power means for generating an error signal representative of the difference between the speed of said delivery means and the speed of said vehicle; and control means responsive to said error signal for controlling the speed of said power means to track the speed of said vehicle.