Apparatus for measuring EGR and method
First Claim
1. A method of operating an air-breathing internal combustion (IC) engine having exhaust gas recirculation (EGR) and a device for controlling EGR, said method comprising the steps of:
- calculating the total flow of gasses consumed by said IC engine;
measuring the actual fresh air flow to said engine;
subtracting the actual fresh air flow from said total flow to provide a measure of EGR flow; and
using said EGR flow as an input to said control device.
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Accused Products
Abstract
An air breathing fuel consuming internal combustion engine with EGR and a control for the quantity of EGR. The total gas flow of the engine is calculated by measuring temperature and pressure at the intake to the engine. The fresh air flow is measured by an orifice or venturi at any point in the flow path for fresh air for combustion by the engine prior to the introduction of the EGR flow. The difference between the calculated total flow and fresh air flow is the actual EGR flow which is used to set the EGR relative to total flow according to one of a number of selected control algorithms.
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Citations
22 Claims
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1. A method of operating an air-breathing internal combustion (IC) engine having exhaust gas recirculation (EGR) and a device for controlling EGR, said method comprising the steps of:
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calculating the total flow of gasses consumed by said IC engine; measuring the actual fresh air flow to said engine; subtracting the actual fresh air flow from said total flow to provide a measure of EGR flow; and using said EGR flow as an input to said control device. - View Dependent Claims (2, 3, 4)
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5. A control system for an exhaust gas recirculation system (EGR) of an internal combustion (IC) engine, said system comprising:
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a device for controlling the flow of EGR in response to the differential of at least two input signals; a first device for calculating the total flow of gasses consumed by said IC engine and providing a signal proportional to said total gas flow to said flow control device; and a second device for measuring the fresh air flow to said IC engine and providing a signal proportional to said fresh air flow to said flow control device, whereby the difference between said total flow and said fresh air flow is the actual EGR flow. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. An internal combustion (IC) engine system comprising:
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an air-breathing IC engine having an intake air system for receiving gas for combustion and an exhaust for discharging products of combustion; a flow control device for selectively fluidly connecting a controlled percentage of the products of combustion to the intake air system of said IC engine; a device for actuating said flow control device and response to the differential of at least two input signals; a first device for calculating the total flow of gasses consumed by said IC engine and providing a signal proportional to said total gas flow to said flow control device; and a second device for measuring the fresh air flow to said IC engine and providing a signal proportional to said fresh air flow to said flow control device, whereby the difference between said total flow and said fresh air flow is the actual EGR flow. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification