Integrated transmission-engine control

An integrated transmission-engine control for a hydrostatic transmission having a variable displacement unit connectable to an engine and a displacement unit connected to an output shaft and said engine having adjustable fuel supply means comprising, a power demand valve for converting an operator's accelerator command to a fluid pressure primary control signal, ratio governor means to control said variable displacement unit to set the transmission ratio to set engine speed, fuel supply controlling means for controlling said adjustable fuel supply means to establish engine horsepower, and means for directing said primary control signal to both said fuel supply controlling means and the ratio governor means to match engine horsepower to engine speed for minimum fuel consumption.

An integrated transmission-engine control having a first means responsive to a fluid pressure control signal to set transmission ratio, a second means responsive to said fluid pressure control signal to establish a fuel setting to an engine, and acceleration valve means for modifying said control signal on start-up to limit engine speed and horsepower.

A integrated transmission-engine control having a first means responsive to a fluid pressure control signal to set transmission ratio, a second means responsive to said fluid pressure control signal to establish a fuel setting to an engine, and output speed governor means for modifying said control signal in response to a predetermined transmission output speed to reduce the fuel supplied to the engine and to change the transmission ratio to reduce engine speed.

An integrated transmission-engine control for a system having a hydrostatic transmission with a variable displacement unit connectable to an engine having adjustable fuel supply means and a second displacement unit connectable to an output shaft comprising, a ratio governor means including a first valve for setting a pressure signal for establishing a transmission ratio to set engine speed, fluid pressure responsive means for controlling said adjustable fuel supply means to establish engine horsepower, power demand means including a second valve for establishing a fluid pressure primary control signal applied to said first and second valves to match engine horsepower to engine speed, acceleration valve means for comparing a pressure with the pressure set by said first valve for modifying the action of said second valve, and output speed governor means including a third valve responsive to transmission output speed for modifying said primary control signal.