Patent ID: 7762066
Filing Date: 2010-07-27
Classification: B60K,B60T,F02B,F04B,Y02T

Abstract:
1. A regeneration system for use with a reciprocating-piston engine having at least one combustion cylinder in which a piston, connected to a crankshaft by a connect rod, reciprocates, the regeneration system comprising: a hydraulic pump/motor having: a source of hydraulic fluid, in fluid communication with the inlet/outlet port via a check valve, for supplying hydraulic fluid to the pump/motor, when operating in pump mode, responsive to an injection control signal; a three-way control valve having a first port, a second port and a third port, the three-way control valve operable, responsive to a position control signal, between a first position in which the first port is in fluid communication with the second port, a second position in which the first port is in fluid communication with the third port, and a third position in which none of the first, second and third ports is in fluid with any other of the first, second and third ports, and wherein the first port is in fluid communication with the inlet/outlet port; a sink, in fluid communication with the inlet/outlet port via the third port of the three-way valve, for receiving hydraulic fluid from the pump/motor, when operating in motor mode, responsive to a dump control signal; a pressure control valve, having an inlet port in fluid communication with the third port of the three-way valve and an outlet port, for varying the resistance to hydraulic flow between the inlet port and the outlet port responsive to a pressure control signal; a hydraulic accumulator, in fluid communication with the second port of the three-way control valve, for supplying pressurized hydraulic fluid to the pump/motor when operating in motor mode, and in fluid communication with the third port of the three-way valve via the outlet port of the pressure control valve for receiving pressurized hydraulic fluid from the pump/motor when operating in pump mode; and a control unit for receiving a crankshaft position signal and an accumulator pressure signal, and for generating the injection control signal, the position control signal, the dump control signal and the pressure control signal in accordance the operating mode of the pump/motor, a desired degree of brake force and a desired degree of motive power generation and with timing of the control signals derived from the crankshaft position; wherein pressurized hydraulic fluid derived from engine power in the pump/motor, operating in pump mode, is received by and stored in the hydraulic accumulator, and motive power derived from pressurized hydraulic fluid, received from the hydraulic accumulator, in the pump/motor, operating in the motor mode, is transferred to the crankshaft.