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An injection mixing apparatus is provided for use with a spraying system carried on a mobile vehicle of the type including a spray bar, a carrier reservoir for holding a supply of a liquid carrier medium, a main pump interposed between the carrier reservoir and the spray bar, a flow control valve in

An injection mixing apparatus is provided for use with a spraying system carried on a mobile vehicle of the type including a spray bar, a carrier reservoir for holding a supply of a liquid carrier medium, a main pump interposed between the carrier reservoir and the spray bar, a flow control valve interposed between the main pump and the spray bar, a ground speed sensor for developing a ground speed signal corresponding to the speed of the vehicle, a pressure sensor for sensing the pressure across the spray bar and developing a corresponding pressure signal and a supply of chemical agent to be mixed with the carrier at a desired concentration for delivery at the spray bar. The injection mixing apparatus comprises at least one injection control loop with an injection pump coupled intermediate the supply and the main pump for injecting the chemical agent into the carrier ahead of the main pump, and an injection controller for controlling the injection pump. The injection controller comprises a tachometer for sensing the rotational speed of the injection pump and developing a corresponding rotational speed signal and a pump control circuit for developing a speed control signal for controlling the pump rotational speed in response to a first input signal and a feedback signal comprising the rotational speed signal. A system controller develops the first input signal and includes a circuit for developing a flow rate signal corresponding to the flow rate of material to the spray bar, and for applying this flow rate signal to the pump control circuit as the first input signal.

대표청구항 ▼

An injection mixing apparatus for use with a spraying system carried on a mobile vehicle of the type including a spray bar, a carrier reservoir for holding a supply of a liquid carrier medium, a main pump interposed between said carrier reservoir and said spray bar, a flow control valve interposed b

An injection mixing apparatus for use with a spraying system carried on a mobile vehicle of the type including a spray bar, a carrier reservoir for holding a supply of a liquid carrier medium, a main pump interposed between said carrier reservoir and said spray bar, a flow control valve interposed between said main pump and said spray bar, a ground speed sensor for developing a ground speed signal corresponding to the speed of said vehicle, a pressure sensor for sensing the pressure across the spray bar and developing a corresponding pressure signal and a supply of chemical agent to be mixed with said carrier at a desired concentration for delivery at said spray bar, said apparatus comprising: at least one injection control loop comprising injection pump means coupled intermediate said supply and said main pump for injecting said chemical agent into said carrier ahead of said main pump, and an injection controller for controlling said injection pump means; said injection controller comprising tachometer means for sensing the rotational speed of said injection pump means and developing a corresponding rotational speed signal and a pump control circuit for developing a speed control signal for controlling said rotational speed in response to a first input signal and a feedback signal comprising said rotational speed signal; and a system controller for developing said first input signal including means for developing a flow rate signal corresponding to the flow rate of material to the spray bar, and for applying said flow rate signal to said pump control circuit as said first input signal.