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US 5,483,934 AGranted
Method for operating a four-stroke internal combustion engine with externally supplied ignition and direct injection, and apparatus for performing the method
AssigneeRobert Bosch GmbH
InventorHeinz Stutzenberger
Life of this patent
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Abstract
A system for reducing fuel consumption in an internal combustion engine and to meet optimal exhaust emissions values.
Claims20
A method of operating a four-stroke internal combustion engine with externally supplied ignition and direct fuel injection into respective combustion chambers of said engine, which comprises:
- causing an injection onset during a full-load operation during an intake stroke within a range of operation of a piston between top dead center (TDC) and bottom dead center (BDC) of an applicable cylinder of said engine and with an unthrottled delivery of air into a respective one of said combustion chambers;
- causing an injection onset during a low load range of operation just prior to TDC and an ignition, within a predetermined operating range of an engine performance graph between said full-load operation and said low-load range of operation;
- controlling an opening of the air intake cross section of said engine via an intake throttle device, said device being positioned as a function of a torque-demand input provided by a gas pedal position;
- and
- establishing a substantially constant position of said intake throttle device in other operating ranges for each of respective said other operating ranges;
- controlling fuel injection quantities in accordance with said gas pedal position over an entire engine performance graph range;
- and
- controlling a recirculated exhaust gas quantity (EGR) within a specific operating range within a range internal to said entire engine performance graph range, said specific operating range adjoining said predetermined operating range in which said opening of an air intake cross section is controlled.
5 more elements
A system for operating an internal combustion engine with externally supplied ignition and direct injection of fuel into respective combustion chambers of an engine in which:
- said engine is equipped with a plurality of cylinders, a piston operative in each of said cylinders, a series of combustion chambers defined by said piston in each of said cylinders;
- at least one air intake line connected to said combustion chambers, a control valve for controlling air flow to each of said combustion chambers, at least one intake throttle device in at least one said air intake line, at least one exhaust line connected to each of said combustion chambers,
- an exhaust gas recirculation (EGR) line branching off from said at least one exhaust line and being connected to said at least one air intake line;
- a control valve in said EGR line;
- a fuel injection valve connected with each of said combustion chambers, a high pressure source connected to each said fuel injection valve via corresponding fuel lines, control means to control fuel flow to each of said fuel injection valves;
- a control means for controlling said intake throttle devices;
- a control means for controlling said control valve for said EGR line;
- a control unit for controlling each of said fuel injection valves, said control means, said throttle control means and said EGR control valve;
- a position transducer connected to a gas pedal which provides an output signal to said control unit which controls said injector valves with respect to an onset and duration of injection;
- said control unit being connected to an exhaust gas sensor, an RPM transducer and a crankshaft angle encoder from which timing signals are extrapolated to perform selected functions at appropriate times.
7 more elements
Dependencies are inferred from the claim text.