Internal combustion engine with a dual turbocharger system
First Claim
1. An internal combustion engine with a dual turbocharger system comprising:
- a multi-cylinder internal combustion engine with an air intake and an exhaust gas outlet;
a first and a second turbocharger arranged in parallel with each other with respect to the engine, each including a turbine and a turbine driven compressor, the turbines being connected with the exhaust gas outlet of the engine;
an intake switching valve installed downstream of the second turbocharger compressor and an exhaust switching valve installed in an exhaust conduit in which the second turbocharger is installed;
means for measuring an intake air quantity;
means for detecting a transmission gear position;
means for opening the intake and exhaust switching valves whenever the intake air quantity is greater than a predetermined air quantity and for closing the intake and exhaust switching valves whenever the intake air quantity is equal to or less than the predetermined intake air quantity;
an exhaust bypass conduit bypassing the exhaust bypassing the exhaust switching valve and an exhaust bypass valve installed in the exhaust bypass conduit; and
exhaust bypass valve opening control means for controlling a speed of opening the exhaust bypass valve.
1 Assignment
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Accused Products
Abstract
An internal combustion engine with a dual turbocharger system includes a first turbocharger operated through an entire intake air quantity, a second turbocharger operated only at large intake air quantities, an exhaust bypass conduit bypassing a turbine of the second turbocharger, an exhaust bypass valve installed in the exhaust bypass conduit, and exhaust bypass valve opening control means for controlling at least one of a time to begin opening and a speed of opening the exhaust bypass valve. The exhaust bypass valve is opened before the turbocharger operation is switched from a "one-turbocharger-operation" to a "two-turbocharger-operation" so that the second turbocharger is run-up and a smooth transition can be obtained. The exhaust bypass valve begins to open at a lower charging pressure when a transmission gear position is low than when the gear position is high, a period of time for running-up the second turbocharger is lengthened so that the second turbocharger is sufficiently run-up and a torque shock at the transition form "one-turbocharger-operation" to "two-turbocharger-operation" is minimized.
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Citations
10 Claims
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1. An internal combustion engine with a dual turbocharger system comprising:
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a multi-cylinder internal combustion engine with an air intake and an exhaust gas outlet; a first and a second turbocharger arranged in parallel with each other with respect to the engine, each including a turbine and a turbine driven compressor, the turbines being connected with the exhaust gas outlet of the engine; an intake switching valve installed downstream of the second turbocharger compressor and an exhaust switching valve installed in an exhaust conduit in which the second turbocharger is installed; means for measuring an intake air quantity; means for detecting a transmission gear position; means for opening the intake and exhaust switching valves whenever the intake air quantity is greater than a predetermined air quantity and for closing the intake and exhaust switching valves whenever the intake air quantity is equal to or less than the predetermined intake air quantity; an exhaust bypass conduit bypassing the exhaust bypassing the exhaust switching valve and an exhaust bypass valve installed in the exhaust bypass conduit; and exhaust bypass valve opening control means for controlling a speed of opening the exhaust bypass valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An internal combustion engine with a dual turbocharger system comprising:
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a multi-cylinder internal combustion engine with an air intake and an exhaust gas outlet; a first and a second turbocharger arranged in parallel with each other with respect to the engine, each including a turbine and a turbine driven compressor, the turbines being connected with the exhaust gas outlet of the engine; an intake switching valve installed downstream of the second turbocharger compressor and an exhaust switching valve installed in an exhaust conduit in which the second turbocharger is installed; means for measuring an intake air quantity; means for detecting a transmission gear position; means for measuring a charging pressure; means for opening the intake and exhaust switching valves whenever the intake air quantity is greater than a predetermined air quantity and for closing the intake and exhaust switching valves whenever the intake air quantity is equal to or less than the predetermined intake air quantity; an exhaust bypass conduit bypassing the exhaust switching valve and an exhaust bypass valve installed in the exhaust bypass conduit; and exhaust bypass valve opening control means for opening the exhaust bypass valve at a lower charging pressure at a low transmission gear position than at a high transmission gear position.
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9. An internal combustion engine with a dual turbocharger system comprising:
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a multi-cylinder internal combustion engine with an air intake and an exhaust gas outlet; a first and a second turbocharger arranged in parallel with each other with respect to the engine, each including a turbine and a turbine driven compressor, the turbines being connected with the exhaust gas outlet of the engine; an intake switching valve installed downstream of the second turbocharger compressor and an exhaust switching valve installed in an exhaust conduit in which the second turbocharger is installed; means for measuring an intake air quantity; means for detecting a transmission gear position; means for opening the intake and exhaust switching valves whenever the intake air quantity is greater than a predetermined air quantity and for closing the intake and exhaust switching valves whenever the intake air quantity is equal to or less than the predetermined intake air quantity; an exhaust bypass conduit bypassing the exhaust switching valve and an exhaust bypass valve installed in the exhaust bypass conduit; and exhaust bypass valve opening control means for controlling a speed of opening the exhaust bypass valve, the exhaust bypass valve opening control means opening the exhaust bypass valve more quickly at a low transmission gear position than at a high transmission gear position.
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10. An internal combustion engine with a dual turbocharger system comprising:
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a multi-cylinder internal combustion engine with an air intake and an exhaust gas outlet; a first and a second turbocharger arranged in parallel with each other with respect to the engine, each including a turbine and a turbine driven compressor, the turbines being connected with the exhaust gas outlet of the engine; an intake switching valve installed downstream of the second turbocharger compressor and an exhaust switching valve installed in an exhaust conduit in which the second turbocharger is installed; means for measuring an intake air quantity; means for detecting a transmission gear position; means for opening the intake and exhaust switching valves whenever the intake air quantity is greater than a predetermined air quantity and for closing the intake and exhaust switching valves whenever the intake air quantity is equal to or less than the predetermined intake air quantity; an exhaust bypass conduit bypassing the exhaust switching valve and an exhaust bypass valve installed in the exhaust bypass conduit; and exhaust bypass valve opening control means for controlling a speed of opening the exhaust bypass valve, the exhaust bypass valve opening control means opening the exhaust bypass valve more quickly at a low transmission gear position than at a small engine acceleration rate.
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Specification