Patent ID: 8087396
Filing Date: 2012-01-03
Classification: F01L,F02D

Abstract:
1. A universal energy-saving system for multiple working conditions, comprising: an electronic control unit, an actuator and an engine; wherein the engine is a four-stroke engine with multiple cylinders and comprises: cylinders, a piston, an inlet valve, an exhaust valve, a fuel injector, an inlet manifold, an exhaust manifold and an exhaust trunk; the electronic control unit is adapted to drive the actuator to control the inlet valve and the exhaust valve of the engine to move according to a pre-defined circulation mode or a regular mode, and adapted to control on and off of a power supply of the fuel injector, so as to greatly reduce, when the vehicle glides and races with reduced pressure and no fuel, resistance of the engine to get a farthest gliding distance, and to use, when the vehicle operates with reduced cylinders, less fuel and has a smallest resistance of non-working cylinder, and to maintain power at a normal working condition, to achieve an objective of energy-saving and emission reduction; wherein the circulation mode comprises: during four time periods of the crankshaft angle 0°-180°, 180°-360°, 360°-540° and 540°-720°, in each time period, there is an exhaust valve of each cylinder is at an open or part open state, the inlet valve only opens at an inlet stroke, the inlet valve only takes in air but not exhausts to make the inlet manifold vacuum, the exhaust valve both takes in air and exhausts, part of the air moves forward, or moves back to flow and exchange in the engine complementarily via the exhaust valve and the exhaust manifold with the intake and exhaust actions of each cylinder, remained air is directly emitted out from the exhaust trunk, to eliminate a compression stroke and an expansion stroke, to become a two-stroke procedure, and to eliminate a resistance when the engine races without fuel; wherein the actuator comprises: a position limit apparatus which is able to restrict, under control of the electronic control unit, the exhaust valve of the engine of the vehicle at a regular movement state or at a non-close state; at the non-close state, the exhaust valve moves according to a constant half open movement curve of the exhaust valve: during the four time periods of the crankshaft angle 0°-180°, 180°-360°, 360°-540° and 540°-720°, the exhaust valve corresponding to the exhaust stroke moves to a largest lift from a constant half open state and then moves back to the constant half open state, exhaust valves corresponding to the intake stoke, the compression stoke and the expansion stroke keep in the constant half open state.