Description:Complete Specification:

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.

Field of the invention
[0001] This invention relates to an exhaust gas recirculation valve, and more specifically to a method for varying an opening percentage of an exhaust gas recirculation valve in an open loop air system due to the intake depression caused by air filter clogging.

Background of the invention
[0002] IN 01555CH2014 A describes a method for monitoring an exhaust gas recirculation valve. The method comprises determining an actual value of a vane angle of a vane of a turbine, characterized in that monitoring an actual value of an opening percentage of the exhaust gas recirculation valve as a function of the actual value of the vane angle of the vane of the turbine

Brief description of the accompanying drawing
[0003] Figure 1 illustrates a flowchart depicting a method for varying an opening percentage of an exhaust gas recirculation valve based on pressure differential of air between an inlet manifold of an engine and an inlet manifold of an air filter

Detailed description of the embodiments
[0004] Figure 1 illustrates a method 100 for varying an opening percentage of an exhaust gas recirculation valve based on a pressure differential of air between an inlet manifold of an engine and an inlet manifold of an air filter. The method 100 comprises determining 110 a pressure of air at an inlet manifold of an air filter, determining 120 a pressure of air at an inlet manifold of an engine, and determining 130 an algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter. The method 100 further comprises comparing 140 the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter with tabled values from base trials, determining 150 an opening percentage of an exhaust gas recirculation valve to permit a required quantity of exhaust gas to flow from an exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve, and controlling 160 the opening percentage of the exhaust gas recirculation valve to a required opening percentage to facilitate channeling the required quantity of exhaust gas from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve.

[0005] Figure 1 illustrates a method 100 for varying an opening percentage of an exhaust gas recirculation valve based on a pressure differential of air between an inlet manifold of an engine and an inlet manifold of an air filter. The method 100 comprises determining 110 a pressure of air at an inlet manifold of the air filter. More specifically, a pressure sensor that is positioned at the inlet of the air filter is adapted to measure the pressure of air at the inlet of the air filter. On measuring the pressure of air at the inlet of the air filter, the pressure sensor that is positioned at the inlet of the air filter transmits a signal to an engine control unit that is indicative of the pressure of air that is measured at the inlet of the air filter. The engine control unit therein determines the pressure of air entering the inlet of the air filter from the transmitted signal of the pressure sensor. The method 100 comprises determining 120 a pressure of air at an inlet manifold of the engine. More specifically, a pressure sensor that is positioned at the inlet manifold of the engine is adapted to measure the pressure of air at the inlet manifold of the engine. On measuring the pressure of air at the inlet manifold of the engine, the pressure sensor that is positioned at the inlet manifold of the engine transmits a signal to an engine control unit that is indicative of the pressure of air that is measured at the inlet manifold of the engine. The engine control unit therein determines the pressure of air entering the inlet manifold of the engine from the transmitted signal of the pressure sensor.

[0006] The engine control unit therein determines 130 an algebraic pressure difference between the pressure of air at the inlet manifold of the engine and the pressure of air at the inlet manifold of the air filter. Once the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and the pressure of air at the inlet manifold of the air filter is determined, the engine control unit compares 150 the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter with tabled values from base trials. More specifically, the tabled values from base trials is obtained during a calibration process of the fuel injection system when the values of the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the pressure of air at the inlet manifold of the air filter are computed for different loading conditions of the fuel injection system on a test bench. The engine control unit determines 150 an opening percentage of the exhaust gas recirculation valve to permit a required quantity of exhaust gas to flow from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve. Thereafter, the engine control unit controls 160 the opening percentage of the exhaust gas recirculation valve to a required opening percentage to facilitate channeling the required quantity of exhaust gas from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve.

[0007] In an exemplary embodiment, the method 100 for varying the opening percentage of the exhaust gas recirculation valve based on the pressure differential of air between the inlet manifold of the engine and the inlet manifold of the air filter further comprises determining 170 a new opening percentage of the exhaust gas recirculation valve to permit a new required quantity of exhaust gas to flow from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve. The new opening percentage of the exhaust gas recirculation valve is determined based on a comparison between the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter with tabled values from base trials. Based on the determination of the new opening percentage of the exhaust gas recirculation valve, the opening percentage of the exhaust gas recirculation valve is controlled 170 to a new required opening percentage to facilitate channeling the new required quantity of exhaust gas from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve. The process is repeated iteratively to vary the opening percentage of the exhaust gas recirculation valve to the new required opening percentage for varying pressure differentials between the inlet manifold of the engine and the inlet manifold of the air filter.

[0008] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.

, Claims:We Claim

1. A method (100) for varying an opening percentage of an exhaust gas recirculation valve based on a pressure differential of air between an inlet manifold of an engine and an inlet manifold of an air filter, the method (100) comprising:
determining (110) a pressure of air at an inlet manifold of an air filter;
determining (120) a pressure of air at an inlet manifold of an engine;
determining (130) an algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter;
comparing (140) the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter with tabled values from base trials;
determine (150) an opening percentage of an exhaust gas recirculation valve to permit a required quantity of exhaust gas to flow from an exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve; and
controlling (160) the opening percentage of the exhaust gas recirculation valve to a required opening percentage to facilitate channeling the required quantity of exhaust gas from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve.

2. The method (100) for varying the opening percentage of the exhaust gas recirculation valve based on the pressure differential of air between the inlet manifold of the engine and the inlet manifold of the air filter in accordance with Claim 1, further comprising:
determine (170) a new opening percentage of the exhaust gas recirculation valve to permit a new required quantity of exhaust gas to flow from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve based on a comparison of the algebraic pressure difference between the pressure of air at the inlet manifold of the engine and at the inlet manifold of the air filter with tabled values from base trials; and
controlling (180) the opening percentage of the exhaust gas recirculation valve to a new required opening percentage to facilitate channeling the new required quantity of exhaust gas from the exhaust gas manifold of the engine to the inlet manifold of the engine via the exhaust gas recirculation valve.