초록 ▼

A drive train for a vehicle having front and rear wheels includes a fluidic motor and a pump interconnected in a continuous loop, with one conduit connected to the inlet of the fluidic motor to the outlet of the pump and a second conduit connecting the inlet of the pump to the outlet of the fluidic

A drive train for a vehicle having front and rear wheels includes a fluidic motor and a pump interconnected in a continuous loop, with one conduit connected to the inlet of the fluidic motor to the outlet of the pump and a second conduit connecting the inlet of the pump to the outlet of the fluidic motor. A gas/liquid fluid accumulator is in fluid communication with the first conduit and a low pressure reservoir is in fluid communication with the second conduit. An engine, sized to match the average torque demanded of the vehicle, is employed to drive the pump. Sensors are included for detecting the pressure within the accumulator and the power demanded of the vehicle by the driver and, optionally, vehicle speed. A motor controller controls displacement of the fluidic motor in accordance with the sensed power demand and a pump controller controls displacement of the pump responsive to the signal for detected pressure.

대표청구항 ▼

[ What is claimed:] [1.] A drive train for a vehicle having front and rear wheels, comprising:at least one fluidic motor, having an inlet and an outlet, for driving at least one of the wheels;at least one pump for producing a flow of hydraulic fluid to drive said fluidic motor, said pump having an o

[ What is claimed:] [1.] A drive train for a vehicle having front and rear wheels, comprising:at least one fluidic motor, having an inlet and an outlet, for driving at least one of the wheels;at least one pump for producing a flow of hydraulic fluid to drive said fluidic motor, said pump having an outlet connected by first conduit means to the inlet of said fluidic motor and an inlet connected by second conduit means to the outlet of said fluidic motor;at least one engine for driving said one pump at a variable speed;a fluid accumulator in fluid communication with said first conduit means and containing pressurized gas in a gas space and a quantity of the hydraulic fluid;at least one fluid reservoir in fluid communication with said second conduit means;a pressure detector for detecting pressure within said accumulator and for generating a pressure signal representative of said detected pressure;power demand sensing means for sensing a power demand by a driver of the vehicle for acceleration or deceleration of the vehicle;a motor controller for controlling displacement of said fluidic motor responsive to the sensed power demand and said pressure signal; anda pump controller for decreasing displacement of said pump responsive to a drop in the detected pressure indicated by said pressure signal, thereby increasing the speed of said one engine, and for increasing displacement of said pump when the engine speed increases to a predetermined value.