Device and method for controlling fuel injection in an engine depending on the exhaust gas partial recirculation rate

A method for controlling fuel injection in an internal combustion engine of an automotive vehicle, the internal combustion engine being linked at its inlet to a fresh air intake pipe and at its outlet to an exhaust gas exhaust pipe, which is in turn linked to a catalytic converter, an exhaust gas partial recirculation circuit tapped at an outlet of the catalytic converter linking the exhaust pipe to the fresh air intake pipe, the method comprising:

• determining a quantity of unburned fuel in the exhaust gases upstream of the catalytic converter;
• determining a quantity of fresh air taken into the internal combustion engine via the fresh air intake pipe;
• estimating a proportion of inert gases in the exhaust gases based on a mass of fresh air taken in;
• and
• determining a quantity of fuel to be injected based on the quantity of unburned fuel in the exhaust gases upstream of the catalytic converter, the mass of fresh air taken in, and the proportion of inert gases in the exhaust gases.

A device for controlling fuel injection in an internal combustion engine of an automotive vehicle, the internal combustion engine being linked at its inlet to a fresh air intake pipe and at its outlet to an exhaust gas exhaust pipe including a catalytic converter, an exhaust gas partial recirculation circuit tapped at an outlet of the catalytic converter linking the exhaust pipe to the fresh air intake pipe, the device comprising:

• an electronic control unit configured to
• determine a quantity of unburned fuel in exhaust gases upstream of the catalytic converter,
• determine a quantity of fresh air taken into the internal combustion engine,
• estimate a mass of fresh air taken in,
• estimate a proportion of inert gases in the exhaust gases based on the estimated mass of fresh air taken in;
• and
• determine a quantity of fuel to be injected based on the determined quantity of unburned fuel in the exhaust gases upstream of the catalytic converter, the estimated mass of fresh air taken in, and estimated proportion of inert gases in the exhaust gases.