Exhaust Gas Purification System for Internal Combustion Engine
First Claim
1. An exhaust gas purification system for an internal combustion engine, characterized by comprising:
- an EGR apparatus for introducing at least part of the exhaust gas of said internal combustion engine as EGR gas into an air intake system of said internal combustion engine;
a supercharger for supercharging intake air using energy from the exhaust gas of said internal combustion engine;
EGR gas amount control unit for controlling the EGR gas amount introduced into said air intake system of said internal combustion engine by said EGR apparatus;
target EGR gas amount calculation unit for calculating a target EGR gas amount that is a target value of the EGR gas amount, based on the operating state of said internal combustion engine;
target charging pressure calculation unit for calculating a target charging pressure that is a target value of the charging pressure, based on the operating state of said internal combustion engine; and
charging pressure detection unit for detecting the actual charging pressure, whereinif the actual charging pressure detected by said charging pressure detection unit is lower than the target charging pressure when said internal combustion engine is in a transient operating state, said EGR gas amount control unit controls the EGR gas amount to an amount smaller than the target EGR gas amount.
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Accused Products
Abstract
It is an object of the present invention to suppress NOx emissions while also suppressing an increase in unburned fuel emission and accidental fire in an exhaust gas purification system for an internal combustion engine that has a super charger and an EGR apparatus, when the internal combustion engine is in a transient operating state. In the present invention, a target charging pressure and a target EGR gas amount are calculated based on the operating state of the internal combustion engine. If the actual charging pressure has not reached the target charging pressure when the internal combustion is operating in a transient state, then the EGR gas amount is controlled to an amount smaller than the target EGR gas amount.
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Citations
24 Claims
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1. An exhaust gas purification system for an internal combustion engine, characterized by comprising:
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an EGR apparatus for introducing at least part of the exhaust gas of said internal combustion engine as EGR gas into an air intake system of said internal combustion engine; a supercharger for supercharging intake air using energy from the exhaust gas of said internal combustion engine; EGR gas amount control unit for controlling the EGR gas amount introduced into said air intake system of said internal combustion engine by said EGR apparatus; target EGR gas amount calculation unit for calculating a target EGR gas amount that is a target value of the EGR gas amount, based on the operating state of said internal combustion engine; target charging pressure calculation unit for calculating a target charging pressure that is a target value of the charging pressure, based on the operating state of said internal combustion engine; and charging pressure detection unit for detecting the actual charging pressure, wherein if the actual charging pressure detected by said charging pressure detection unit is lower than the target charging pressure when said internal combustion engine is in a transient operating state, said EGR gas amount control unit controls the EGR gas amount to an amount smaller than the target EGR gas amount. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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7-10. -10. (canceled)
Specification