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US 6,687,599 B2Granted
Method and apparatus for calculating air-mass drawn into cylinders, and method and apparatus for controlling fuel
AssigneeHyundai Motor Company
InventorJae-Hyung Lee
Life of this patent
Estimating the term…
Abstract
There is a time delay between the moment of fuel injection and the moment when air with the injected fuel is drawn into cylinders. At the time of fuel injection, air-mass that will be drawn into cylinders after the delay time is estimated on the basis of expectation values of throttle opening, air-mass drawn into an intake-manifold, and intake-manifold pressure. Fuel amount is in turn calculated based on the estimated air-mass.
Claims14
A method for estimating air-mass drawn into cylinders comprising:
- detecting a current throttle opening TPS;
- detecting a current engine speed RPM;
- detecting an air mass Mmani currently drawn into an intake-manifold;
- calculating a delay period Δt of from injecting fuel to a predetermined target moment;
- calculating an expectation value E_TPSΔt of throttle opening after the delay period Δt;
- calculating an expectation value E_Mmani,Δt of air-mass drawn into the intake-manifold after the delay period Δt on the basis of the expectation value E_TPSΔt of throttle opening;
- calculating an expectation value E_Pmani,Δt of intake-manifold pressure after the delay period Δt on the basis of the expectation value E_Mmani,Δt of air-mass drawn into the intake-manifold;
- and
- calculating an expectation value E_Mcyl,Δt of air-mass drawn into cylinders after the delay period Δt on the basis of the expectation value E_Pmani,Δt of intake-manifold pressure.
6 more elements
A system for estimating cylinder intake air-mass comprising:
- a throttle opening detector for detecting throttle opening;
- an engine speed detector for detecting engine speed;
- an intake-manifold pressure detector for detecting intake-manifold pressure;
- an intake air temperature detector for detecting air temperature drawn into an intake manifold;
- and
- an electronic control unit for calculating air-mass drawn into cylinders based on signals of the throttle opening detector, the engine speed detector, the intake-manifold pressure detector, and the intake air temperature detector,
- wherein the electronic control unit is programmed to execute instructions for:
- detecting a current throttle valve opening TPS;
- detecting a current engine speed RPM;
- detecting a current intake-manifold intake air mass Mmani;
- calculating a delay period Δt of from injecting fuel to a predetermined target instance;
- calculating expectation value E_TPSΔt of throttle opening after the delay period Δt;
- calculating expectation value E_Mmani,Δt of air-mass drawn into an intake-manifold after the delay period Δt on the basis of the expectation value E_TPSΔt of throttle opening;
- calculating expectation value E_Pmani,Δt of intake-manifold pressure after the delay period Δt on the basis of the expectation value E_Mmani,Δt of air-mass drawn into the intake-manifold;
- and
- calculating expectation value E_Mcyl,Δt of cylinder intake air-mass after the delay period Δt on the basis of the expectation value E_Pmani,Δt of intake-manifold pressure.
13 more elements
A fuel control method of an engine comprising:
- determining if a predetermined condition is satisfied;
- estimating an expectation value E_Mcyl,Δt of cylinder intake air-mass after the delay period Δt according to a method comprising:
- detecting a current throttle opening TPS;
- detecting a current engine speed RPM;
- detecting a current intake-manifold intake air mass Mmani;
- calculating a delay period Δt of from injecting fuel to a predetermined target instance;
- calculating an expectation value E_TPSΔt of throttle opening after the delay period Δt;
- calculating an expectation value E_Mmani,Δt of air-mass drawn into an intake-manifold after the delay period Δt on the basis of the expectation value E_TPSΔt of throttle opening;
- calculating an expectation value E_Pmani,Δt of intake-manifold pressure after the delay period Δt on the basis of the expectation value E_Mmani,Δt of air-mass drawn into the intake-manifold;
- and
- calculating the expectation value E_Mcyl,Δt of cylinder intake air-mass after the delay period Δt on the basis of the expectation value E_Pmani,Δt of intake-manifold pressure;
- calculating a fuel amount based on the estimated expectation value E_Mcyl,Δt;
- and
- driving injectors based on the calculated fuel amount.
11 more elements
A fuel control system of an engine comprising:
- a throttle opening detector for detecting throttle opening;
- an engine speed detector for detecting engine speed;
- an intake-manifold pressure detector for detecting intake-manifold pressure;
- an intake air temperature detector for detecting air temperature drawn into an intake manifold;
- injectors for injecting fuel into the engine;
- and
- an electronic control unit for calculating fuel amount based on signals of the throttle opening detector, the engine speed detector, the intake-manifold pressure detector, and the intake air temperature detector and for driving the injectors based on the calculated fuel amount,
- wherein the electronic control unit is programmed to execute instructions for:
- determining if a predetermined condition is satisfied;
- estimating an expectation value E_Mcyl,Δt of cylinder intake air-mass after the delay period Δt according to a method comprising:
- detecting a current throttle opening TPS;
- detecting a current engine speed RPM;
- detecting a current intake-manifold intake air mass Mmani;
- calculating a delay period Δt of from injecting fuel to a predetermined target instance;
- calculating an expectation value E_TPSΔt of throttle opening after the delay period Δt;
- calculating an expectation value E_Mmani,Δt of air-mass drawn into an intake-manifold after the delay period Δt on the basis of the expectation value E_TPSΔt of throttle opening;
- calculating an expectation value E_Pmani,Δt of intake-manifold pressure after the delay period Δt on the basis of the expectation value E_Mmani,Δt of air-mass drawn into the intake-manifold;
- and
- calculating the expectation value E_Mcyl,Δt of cylinder intake air-mass after the delay period Δt on the basis of the expectation value E_Pmani,Δt of intake-manifold pressure;
- calculating a fuel amount based on the estimated expectation value E_Mcyl,Δt;
- and
- driving injectors based on the calculated fuel amount.
19 more elements
Dependencies are inferred from the claim text.