US 6,499,469 B2Granted

Fuel injection control system and method and engine control unit for internal combustion engine

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsKen Ogawa, Yutaka Kohda, Hiroshi Tagami, Kazuhiro Ueda

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Abstract

There are provided a control system and method and an engine control unit for an internal combustion engine including two types of variable valve mechanisms capable of changing a camp phase and a cam profile, respectively, which system is capable of determining an amount of fuel to be injected as a value suited to charging efficiency at the time by simplified calculation processing, thereby performing the fuel injection control properly in a simplified manner. The fuel injection control system includes an ECU. The ECU searches a map for a multiplier term Ati for a high-speed cam or low-speed cam based on the rotational speed of the engine and the cam phase, and a map for an addend term Bti for the high-speed cam or the low-speed cam based on the rotational speed of the engine and the cam phase. The ECU calculates a basic fuel injection time period Tibase as the sum of the product of an intake pipe absolute pressure PBA and the multiplier term Ati and the addend term Bti (Ati×PBA+Bti).

Claims15

Dependent claims

A fuel injection control system for an internal combustion engine including intake cams and exhaust cams for opening and closing respective intake valves and exhaust valves, wherein a cam phase as a phase of at least one of each intake cam and each exhaust cam relative to a crankshaft is changeable, and at least one of the intake cam and the exhaust cam can be switched to one of a plurality of kinds of cams having respective profiles different from each other,

the fuel injection control system comprising:
an engine rotational speed-detecting module for detecting a rotational speed of said engine;
a cam phase-detecting module for detecting the cam phase;
an intake pipe pressure parameter-determining module for determining an intake pipe pressure parameter representative of an intake pipe pressure;
a first parameter-determining module for determining a first parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase;
a second parameter-determining module for determining a second parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase;
and
a fuel injection amount-calculating module for calculating an amount of fuel to be injected, by using a linear equation of the intake pipe pressure parameter, the linear equation having a slope of the first parameter and an intercept of the second parameter.

5 more elements

A fuel injection control method for an internal combustion engine including intake cams and exhaust cams for opening and closing respective intake valves and exhaust valves, wherein a cam phase as a phase of at least one of each intake cam and each exhaust cam relative to a crankshaft is changeable, and at least one of the intake cam and the exhaust cam can be switched to one of a plurality of kinds of cams having respective profiles different from each other,

the fuel injection control method comprising the steps of:
detecting a rotational speed of said engine;
detecting the cam phase;
determining an intake pipe pressure parameter representative of an intake pipe pressure;
determining a first parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase;
determining a second parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase;
and
calculating an amount of fuel to be injected, by using a linear equation of the intake pipe pressure parameter, the linear equation having a slope of the first parameter and an intercept of the second parameter.

5 more elements

An engine control unit including a control program for causing a computer to carry out fuel injection control of an internal combustion engine including intake cams and exhaust cams for opening and closing respective intake valves and exhaust valves, wherein a cam phase as a phase of at least one of each intake cam and each exhaust cam relative to a crankshaft is changeable, and at least one of the intake cam and the exhaust cam can be switched to one of a plurality of kinds of cams having respective profiles different from each other,

wherein the control program causes the computer to detect a rotational speed of said engine, detect the cam phase, determine an intake pipe pressure parameter representative of an intake pipe pressure, determine a first parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase, determine a second parameter in dependence on the one of the plurality of cams to which the at least one of the intake cam and the exhaust cam is switched, the detected rotational speed of the engine, and the detected cam phase, and calculate an amount of fuel to be injected, by using a linear equation of the intake pipe pressure parameter, the linear equation having a slope of the first parameter and an intercept of the second parameter.

Dependencies are inferred from the claim text.

Facts

Application: 09/928,132Filed 10 Aug 2001
Priority: JP 2000-24338210 Aug 2000
Published: US 2002/0059919 A123 May 2002
Granted: 31 Dec 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification31 codes

F02D 13/0219
Changing the valve timing only: by shifting the phase, i.e. the opening periods of the valves are constant
F01L 1/267
Characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with…
F01L 1/34
Valve-gear or valve arrangements, e.g. lift-valve gear: characterised by the provision of means for changing the timing of the valves without…
F01L 13/0036
For optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque: the…