Method for controlling torque of a pump

Details Method for controlling torque of a pump Method for controlling torque of a pump

1990-06-19

1992-05-12

Rivell, John

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

417218, F02M 3900

Patent

active

051117894

ABSTRACT:
A torque control system for variable delivery pumps receiving torque from an engine employs a signal related to an engine torque available at each engine speed setting to control the torque, and thus the amount of engine power that is absorbed by the variable delivery pumps. In a low-power regime, wherein the fuel injected into the engine is less than maximum, torque control is effected by comparing the available torque with an amount of torque that would be available at maximum fuel injection. In a high-power regime, wherein the fuel injected is at least a predetermined value, torque contol is effected by comparing the available torque with an amount of torque that is available at a combination of a set engine speed and an actual engine speed. A bias circuit biases the stable speed operating point a small amount below the maximum speed, whereby improved fuel economy is attained. In a system with more than one variable delivery pump, when less than the full number of pumps is employed, control is effected in the low-power regime, even though all pumps in service are receiving maximum fuel.

REFERENCES:
patent: 4606313 (1986-08-01), Izumi et al.
patent: 4773369 (1988-09-01), Kobayashi et al.

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