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AssigneeVisteon Global Technologies, Inc.
InventorsJon Dixon, Roshan Sena Wijetunge
Estimating the term…
The present invention relates to an electronically driven pressure boosting system that is used to boost the torque output of an Internal combustion engine. Engine operating parameters are fed to an engine control unit (ECU) controlling a supercharger that boosts engine torque. The ECU monitors at least one of the engine operating parameters and calculates the likelihood that the engine torque needs to be boosted by the supercharger. When the supercharger is operating at an idle speed, the ECU controls the idle speed so that a lag time varies inversely with the calculated likelihood that the supercharger needs to boost engine torque.
A torque boosting system for boosting the torque of an internal combustion engine, said system comprising means for generating at least one of engine operating parameters, an electrically driven rotary compressor for assisting aspiration of the engine to boost engine torque, an electrical supply system for providing electrical power to drive the compressor, and an electronic control system responsive to said at least one of the engine operating parameters to control the operation of the engine and the compressor such that in an idle mode of operation of the compressor said device does not assist the aspiration of the engine, and in a boost mode of operation of the compressor said device does assist the aspiration of the engine, wherein:
A method of using a torque boosting system to boost the torque of an internal combustion engine, said system comprising means for generating one or more at least one of engine operating parameters, an electrically driven rotary compressor for assisting aspiration of the engine to boost engine torque, an electrical supply system for providing electrical power to drive the compressor, and an electronic control system responsive to said at least one of the engine operating parameters to control the operation of the engine and the compressor, wherein the method comprises the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Supercharged engines: having air intakes specially adapted to selectively deliver naturally aspirated fluid or supercharged fluid
Non-mechanical drives, e.g. fluid drives having variable gear ratio: electric
Controlling engines characterised by their being supercharged: the engines being of fuel-injection type
With rotary pumps: of positive-displacement type
Term ended 4 Oct 2022 (estimated)
a. Field of the Invention
The present invention relates to an electronically driven pressure boosting system that is used to boost the torque output of an internal combustion engine.
b. Related Art
The invention will now be described in further detail, and by way of example only, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a motor vehicle having a 1.4 litre, four cylinder engine system with air charge boosting system including a compressor and an engine control system, according to the invention;
FIG. 2 is a graph plotting engine torque against engine speed for the 1.4 litre engine of FIG. 1 when naturally aspirated, tuned either for maximum torque at a low moderate engine speed, or maximum engine torque at a higher moderate engine speed;
FIG. 1 shows schematically part of a motor vehicle 7 having a reciprocating piston internal combustion engine 1, with four in-line cylinders 2, an air inlet manifold 4 and an exhaust manifold 6 leading respectively to and from each of the cylinders 2. A fuel injection system 8 supplies fuel 11 to cylinders 2 in a manner well-known in the art. An electrically driven boost device (EBD) 10 or compressor, which may be a turbocharger, a supercharger or any other device adapted to provide boost to the vehicle (hereinafter just “supercharger”), is provided upstream of the inlet manifold 4.
Air flows to the inlet manifold 4 through the supercharger 10 when this is operational, or when the supercharger 10 is disabled or idling, through an air bypass conduit 12 in parallel with the supercharger 10. Air is supplied to the supercharger 10 and/or the bypass 12 along an inlet air path 3.
The air bypass conduit 12 has an air valve 13 that automatically opens to permit inlet air 5 to bypass 15 the supercharger 10 when airflow 18 through the supercharger 10 is insufficient to charge the engine cylinders 2 with air. Air supply 19 to the engine 1 is then controlled by the setting of an electronically controlled throttle valve 17 downstream of the supercharger 10 and bypass 12, and the activation of the supercharger 10. When the supercharger 10 is not activated, the engine 1 is normally aspirated, and when the supercharger 10 is activated, the airflow to the engine is increased.