Device for exhaust gas recirculation into the air intake region of motor vehicle internal combustion engines
First Claim
1. A device for exhaust gas recirculation from an outlet region (4) of a motor vehicle internal combustion engine (1) into an air intake region (2), comprising a regulator (15) for adjusting a mixture of exhaust gas and in-flowing air mass feedable to the engine, a first flow rate sensor (14) for determining the mass of the in-flowing air mass, and a fuel feed for introducing to the engine an amount of fuel adjustable as a function of the air mass in-flow rate taking a performance specification signal into consideration, wherein the outlet region (4) is connected with the intake region (2) of the internal combustion engine (1) via a flow channel (6) for the exhaust gas recirculation, the flow channel (6) having at least one temperature sensor (16), one controllable valve (5) as an adjustment member, and a second flow rate sensor (10).
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Abstract
For reduction of toxic components in exhaust gases of internal combustion engines, particularly of nitrogen oxides in motor vehicles, a portion of the exhaust gases, essentially operating as inert gases, are recirculated into the combustion chamber of the engine for the purpose of reducing the peak combustion temperature. In the air intake region the engine is fed an adjustable mixture of partially recirculated exhaust gas and air, wherein the mass of in-flowing air and the mass of exhaust gas recirculated from the engine following its cleaning and cooling are fed respectively to its own flow rate sensor. From the determined mass flow amounts of in-flowing air and recirculated exhaust gas, an actual value signal is formed and compared with a target value signal dependent upon the respective performance specification. A regulation deviation of the actual value signal leads to an adjustment signal, which intervenes into the exhaust gas recirculation for the purpose of adjusting the amount recirculated.
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11 Claims
- 1. A device for exhaust gas recirculation from an outlet region (4) of a motor vehicle internal combustion engine (1) into an air intake region (2), comprising a regulator (15) for adjusting a mixture of exhaust gas and in-flowing air mass feedable to the engine, a first flow rate sensor (14) for determining the mass of the in-flowing air mass, and a fuel feed for introducing to the engine an amount of fuel adjustable as a function of the air mass in-flow rate taking a performance specification signal into consideration, wherein the outlet region (4) is connected with the intake region (2) of the internal combustion engine (1) via a flow channel (6) for the exhaust gas recirculation, the flow channel (6) having at least one temperature sensor (16), one controllable valve (5) as an adjustment member, and a second flow rate sensor (10).
Specification