Engine control system with exhaust gas recirculation and method for determining proper functioning of the EGR system in an automotive engine
First Claim
Patent Images
1. An engine control for an automotive engine having an inlet system and an exhaust system, with said engine control comprising:
- a plurality of sensors for measuring engine operating parameters;
an EGR valve for permitting exhaust gas to flow from the exhaust system to the inlet system of the engine; and
an engine controller, operatively connected with said sensors, for operating the EGR valve by opening the EGR valve during a plurality of test periods separated by non-uniform intervals and by measuring the engine speed response to the opening of the EGR valve during predetermined periods corresponding to the timing of the test periods, with the controller increasing the intensity of the test periods in the event that the engine'"'"'s speed response falls below a predetermined threshold and decreasing the length of the test periods in the event that the engine'"'"'s speed response is greater than a predetermined threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
An engine control for an automotive engine having an inlet system and an exhaust system includes an EGR valve for permitting exhaust gas to flow from the exhaust system to the inlet system, and an engine controller for operating the EGR valve by opening the valve during successive test periods separated by non-uniform intervals, while measuring engine speed response to the opening of the EGR valve so as to diagnose an improperly operating EGR valve.
-
Citations
8 Claims
-
1. An engine control for an automotive engine having an inlet system and an exhaust system, with said engine control comprising:
-
a plurality of sensors for measuring engine operating parameters; an EGR valve for permitting exhaust gas to flow from the exhaust system to the inlet system of the engine; and an engine controller, operatively connected with said sensors, for operating the EGR valve by opening the EGR valve during a plurality of test periods separated by non-uniform intervals and by measuring the engine speed response to the opening of the EGR valve during predetermined periods corresponding to the timing of the test periods, with the controller increasing the intensity of the test periods in the event that the engine'"'"'s speed response falls below a predetermined threshold and decreasing the length of the test periods in the event that the engine'"'"'s speed response is greater than a predetermined threshold.
-
-
2. An engine control for an automotive engine having an inlet system and an exhaust system, with said engine control comprising:
-
a plurality of sensors for measuring engine operating parameters; an EGR valve for permitting exhaust gas to flow from the exhaust system to the inlet system of the engine; and an engine controller, operatively connected with said sensors, for operating the EGR valve by opening the EGR valve during a plurality of test periods and by measuring the engine speed response to the opening of the EGR valve, wherein the test periods during which the EGR valve is opened are separated by nonuniform intervals. - View Dependent Claims (3, 4, 5)
-
-
6. A method for determining proper operation of an EGR system of an automotive engine having an EGR valve operated by an engine controller, comprising the steps of:
-
opening the EGR valve during a plurality of test periods separated by non-uniform intervals; measuring the engine'"'"'s speed response to the opening of the EGR valve during predetermined periods corresponding to the timing of the test periods; and setting a fault code in the event that the engine'"'"'s speed response is less than a predetermined threshold. - View Dependent Claims (7, 8)
-
Specification