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US 5,251,590 AGranted
Method and apparatus for starting an engine utilizing unit valve actuation
AssigneeCaterpillar Inc.
InventorsJames J. Faletti, Yung T. Bui
Life of this patent
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AssigneeCaterpillar Inc.
InventorsJames J. Faletti, Yung T. Bui
Estimating the term…
Starting systems for use with internal combustion engine have in the past used a variety of add on mechanical mechanisms to provide cold starting. Many of these systems fail to provide the option of controllably and modulatively varying the sequence and amount of the opening and closing of an intake or exhaust valve relative to a piston position in a cylinder bore. The present invention provides an electronic control system outputting an discrete control signal, and an opening device for unit actuation of each of the pair of valves independently. The electronic control system is programmable to respond in a first predetermined logic pattern for conventional operation of the engine at which time each of the pair of valves is in the open position during the exhaust stroke. The electronic control system is programmable to a second predetermined logic pattern to vary the operation of the valves associated with the respective bore in the generally closed position for a portion of the exhaust stroke before top dead center during the exhaust stroke of the piston. The preestablished logic pattern controllably, sequentially and modulateably actuate the device for unit actuation, moving each of the valves independently between the open and closed position to effectively increase the heat within the during the movement of a piston from a bottom dead center position to a top dead center position.
A starting system adapted for use with an engine having a conventional four cycle including an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke and including a passage, a pair of bores, a piston during operation of the engine being movably positioned within respective bores between a top dead center position and a bottom dead center position forming the expansion stroke and the reciprocal movement of the piston forming the exhaust stroke;
An engine having a conventional four cycle including an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke and having a passage, a pair of bores, a piston during operation of the engine being movably positioned within respective bores between a top dead center position and a bottom dead center position forming an expansion stroke and the reciprocal movement of the piston forming an exhaust stroke, a pair of valves operatively associated with the passage and communicating between the passage and the respective bores, and having a closed position and an open position, means for opening each of the valves independently in response to receiving a control signal, an electronic control system connected to the opening means and outputting the control signals to be outputted to the opening means in a first predetermined logic pattern during normal engine operation wherein one of said pair of valves is generally open during the exhaust stroke, characterized in that;
A method for starting an engine having a conventional four cycle including an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke and comprising the steps of:
Dependencies are inferred from the claim text.