Diesel EGR control
First Claim
Patent Images
1. A system comprising:
- a diesel fuel engine having an intake manifold and an exhaust manifold;
an exhaust gas recirculation passage coupled between said engine intake manifold and said engine exhaust manifold;
a two-position solenoid valve positioned in said exhaust gas recirculation passage;
a variable area throttle valve coupled to said intake manifold; and
a controller for calculating an actual amount of exhaust gas flowing through said passage and adjusting said throttle valve based on said actual exhaust gas flow so that said actual exhaust gas flow approaches a desired exhaust gas flow.
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Abstract
A method for controlling a diesel engine exhaust gas recirculation system is described. In particular, a simplified diesel engine system is provided where presence of exhaust gas recirculation of flow is controlled via a two-position valve, while a quantity of exhaust gas recirculation is adjusted by varying the throttle valve. In this way, a reduced cost diesel exhaust gas recirculation system is achieved that provides the functionality of having variable amounts of exhaust gas recirculation.
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Citations
18 Claims
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1. A system comprising:
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a diesel fuel engine having an intake manifold and an exhaust manifold;
an exhaust gas recirculation passage coupled between said engine intake manifold and said engine exhaust manifold;
a two-position solenoid valve positioned in said exhaust gas recirculation passage;
a variable area throttle valve coupled to said intake manifold; and
a controller for calculating an actual amount of exhaust gas flowing through said passage and adjusting said throttle valve based on said actual exhaust gas flow so that said actual exhaust gas flow approaches a desired exhaust gas flow. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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a diesel engine having an intake manifold and an exhaust manifold;
an electronically controlled throttle valve coupled to said intake manifold of said diesel engine, where fresh airflow passes by said throttle valve;
an exhaust gas recirculation passage connecting said intake manifold and said exhaust manifold of said diesel engine;
a two-position solenoid valve positioned in said exhaust gas recirculation passage; and
a sensing unit for sensing pressure upstream and downstream of said two-position solenoid valve. - View Dependent Claims (7, 8, 9, 10)
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11. A system for an internal combustion engine having a manifold with a first and second inlet, the system comprising:
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a throttle coupled to the first inlet;
an exhaust gas recirculation unit coupled to the second inlet, where recirculated exhaust flow travels from an engine exhaust to the manifold, said unit comprising a restriction in said flow; and
a controller for determining an actual exhaust gas recirculation amount based on a first pressure upstream of said restriction and a second pressure downstream of said restriction, adjusting said throttle based on a requested exhaust gas recirculation amount and said determined amount, and adjusting a diesel fuel injection amount in the engine based on an operating condition. - View Dependent Claims (12, 13, 14)
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15. A system comprising:
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a diesel fuel engine having an intake manifold and an exhaust manifold;
an exhaust gas recirculation passage coupled between said engine intake manifold and said engine exhaust manifold;
a two-position valve positioned in said exhaust gas recirculation passage;
a variable area throttle valve coupled to said intake manifold; and
a controller for, during engine operation, adjusting said throttle valve to adjust an amount of exhaust gas flow through said exhaust gas recirculation passage while adjusting a fuel injection amount to adjust engine output and while maintaining said solenoid valve at a first position. - View Dependent Claims (16, 17, 18)
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Specification