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US 10,704,474 B2Granted
Device for reducing the combustion instabilities of a combustion engine
AssigneeContinental Automotive France
InventorsFlorent David, Frederic Cousin, Damien Fournigault
Life of this patent
Estimating the term…
Abstract
Disclosed is a device for reducing the combustion instabilities of a combustion engine, this device including: an intake circuit admitting oxidizing air to the engine, a valve positioned on the engine oxidizing air intake circuit and designed to regulate the flow rate of oxidant gas admitted to the engine, an exhaust gas recirculation circuit connected to the intake circuit upstream of the oxidizing air flow rate regulating valve. The device is arranged in such a way that, at least when an injection of fuel to the engine is cut off, a minimum opening of the valve is assured so as to eliminate recirculated gases from the intake circuit.
Claims42
A device (100) for reducing combustion instabilities of a combustion engine (1), the device comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and
- wherein the minimum amount opened is zero when an estimated EGR ratio in the intake circuit (2) is less than a predetermined minimum ratio (T1), said minimum amount opened also dependent on a rotational speed of the engine (1).
3 more elements
A device (100) for reducing combustion instabilities of a combustion engine (1), comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and
- wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2) said minimum amount opened also dependent on a rotational speed of the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit,
- wherein the minimum amount opened is zero when the estimated EGR ratio in the intake circuit (2) is less than a first predetermined minimum ratio (T1), said minimum amount opened also dependent on a rotational speed of the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit,
- wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2), said minimum amount opened also dependent on a rotational speed of the engine (1).
3 more elements
A device (100) for reducing combustion instabilities of a combustion engine (1), the device comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and
- wherein the minimum amount opened is zero when an estimated EGR ratio in the intake circuit (2) is less than a predetermined minimum ratio (T1), said minimum amount opened also dependent on a measured water temperature of a coolant of the engine (1).
3 more elements
A device (100) for reducing combustion instabilities of a combustion engine (1), comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and
- wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2), said minimum amount opened also dependent on a measured water temperature of a coolant of the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit,
- wherein the minimum amount opened is zero when the estimated EGR ratio in the intake circuit (2) is less than a first predetermined minimum ratio (T1), said minimum amount opened also dependent on a measured water temperature of a coolant of the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit,
- wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2), said minimum amount opened also dependent on a measured water temperature of a coolant of the engine (1).
3 more elements
A device (100) for reducing combustion instabilities of a combustion engine (1), the device comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and wherein the minimum amount opened is zero when an estimated EGR ratio in the intake circuit (2) is less than a predetermined minimum ratio (T1), said minimum amount opened also dependent on an operating richness in the engine (1).
2 more elements
A device (100) for reducing combustion instabilities of a combustion engine (1), comprising:
- a combustion air intake circuit (2) of the engine;
- a valve (3) positioned on the combustion air intake circuit of the engine that is configured to regulate a flow rate of combustion gas admitted to the engine;
- and
- an exhaust gas recirculation circuit (5) that is connected to the intake circuit (2) upstream of the valve (3) regulating the flow rate of combustion gas,
- wherein the device (100) is configured such that, at least when fuel injection to the engine (1) is cut off, the valve (3) is opened a minimum amount to eliminate recirculated gases from the intake circuit (2), and
- wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2), said minimum amount opened also dependent on an operating richness in the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit,
- wherein the minimum amount opened is zero when the estimated EGR ratio in the intake circuit (2) is less than a first predetermined minimum ratio (T1), said minimum amount opened also dependent on an operating richness in the engine (1).
3 more elements
A method for reducing combustion instabilities of a combustion engine (1), comprising the following steps:
- supplying combustion gas to the engine via an intake circuit (2);
- regulating a flow rate of the combustion gas admitted to the engine (1) using a valve (3) arranged on the intake circuit (2);
- recirculating exhaust gases between an exhaust and an intake of the engine, using a recirculation circuit connected to the intake circuit upstream of the valve (3);
- and
- at least while fuel injection is cut off, opening the valve a minimum amount in order to eliminate the recirculated exhaust gases from the intake circuit, wherein the minimum opening is maintained as long as an estimated EGR ratio in the intake circuit (2) is greater than a predetermined threshold (T2), said minimum amount opened also dependent on an operating richness in the engine (1).
2 more elements
Dependencies are inferred from the claim text.