Control of a variable geometry turbocharger by sensing exhaust pressure

A method for controlling a variable geometry turbocharger used in an internal combustion engine, the method comprising the steps of:

• sensing at least one engine parameter;
• inputting the engine parameter signals to a controller;
• determining a base duty cycle;
• determining a total desired exhaust back pressure based on the inputted engine parameters;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back;
• pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle.

A control system for a variable geometry turbocharger for use in an internal combustion engine, the control system comprising:

• at least one engine sensor able to generate a corresponding engine parameter measurement signal;
• an exhaust back pressure sensor able to generate an exhaust back pressure measurement signal;
• a control device able to actuate a turbocharger nozzle;
• and
• a controller able to receive and process, the exhaust back pressure measurement signal and the at least one engine parameter measurement signal to thereby generate a control signal to the control device, based upon the exhaust back pressure measurement signal and at least one predetermined engine parameter signal, to thereby actuate the turbocharger nozzle.

A method for controlling a variable geometry turbocharger, having an operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining a duty cycle based upon the difference exhaust back pressure;
• and
• actuating turbocharger nozzles based upon the calculated duty cycle;
• whereby the nozzles are positioned to achieve the total desired exhaust back pressure and where the nozzles operate incrementally in relation to nozzle positions existing prior to actuation.

A method for controlling a variable geometry turbocharger, having an operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining a duty cycle based upon the difference exhaust back pressure;
• and
• actuating turbocharger nozzles based upon the calculated duty cycle;
• whereby the nozzles am positioned to achieve the total desired exhaust back pressure and where the nozzles assume predetermined nozzle positions irrespective of nozzle position existing prior to actuation.

A method for controlling a variable geometry turbocharger, having an operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust pressure;
• determining a duty cycle based upon the difference exhaust back pressure;
• and
• actuating turbocharger nozzles based upon the calculated duty cycle;
• whereby the nozzles are positioned to achieve the total desired exhaust back pressure and where the total desired exhaust back pressure is a base desired exhaust back pressure, a temperature desired exhaust back pressure, braking desired exhaust back pressure, or an exhaust gas recirculation desired exhaust back pressure.

A method for controlling a variable geometry turbocharger, having an operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining a duty cycle based upon the difference exhaust back pressure;
• and
• actuating turbocharger nozzles based upon the calculated duty cycle;
• whereby the nozzles are positioned to achieve the total desired exhaust back pressure, wherein the total desired exhaust back pressure comprises the base desired exhaust back pressure, the temperature desired exhaust back pressure, the braking desired exhaust back pressure, and the exhaust gas recirculation desired exhaust back pressure.

A method for controlling a variable geometry turbocharger, having an operatively connected turbine and compressor housing used in an internal combustion engine, the method comprising the steps of:

• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining a duty cycle based upon the difference exhaust back pressure;
• and
• actuating turbocharger nozzles based upon the calculated duty cycle;
• whereby the nozzles are positioned to achieve the total desired exhaust back pressure and wherein the nozzles are filly open at a duty cycle at or below 25 percent, and fully closed at a duty cycle at or above 75 percent.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the nozzles operate incrementally in relation to nozzle positions existing prior to actuation.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the nozzles assume predetermined nozzle positions irrespective of nozzle position existing prior to actuation.

A method for controlling a variable geometry turbochager, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of;

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the base duty cycle is determining through a base duty cycle set-point table based on engine speed and engine load.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein he base duty cycle is determining through a base duty cycle set-point table based on engine temperate, engine speed and engine load.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the base duty cycle is determined through a base duty cycle set-point table based on braking parameters, vehicle speed, engine speed and engine load.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the base duty cycle is determined through a base duty cycle set-point table based on an exhaust gas recirculation signal, engine speed and engine load.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure,
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the base duty cycle is determined through a base duty cycle set-point table based on engine temperature, braking parameters, vehicle speed, an exhaust gas recirculation signal, engine speed and engine load.

A method for controlling a variable geometry turbocharger, having operatively connected turbine and compressor housings, used in an internal combustion engine, the method comprising the steps of:

• determining a base duty cycle;
• determining a total desired exhaust back pressure;
• determining a measured exhaust back pressure;
• determining a difference exhaust back pressure between the total desired exhaust back pressure and the measured exhaust back pressure;
• determining an exhaust pressure duty cycle based upon the difference exhaust back pressure,;
• determining a turbocharger duty cycle by adjusting the base duty cycle by the exhaust pressure duty cycle;
• and
• actuating turbocharger nozzles based upon the turbocharger duty cycle;
• wherein the nozzles are fully open at a duty cycle at or below 25 percent, and filly closed at a duty cycle at or above 75 percent.

A control system for a variable geometry turbocharger, having operatively connected turbine and compressor housings, for use in an internal combustion engine, the control system comprising:

• an exhaust back pressure sensor able to generate an exhaust back pressure measurement signal;
• a control device able to actuate a turbocharger nozzle;
• and
• a controller able to process the exhaust back pressure measurement signal and generate a control signal to the control device, based upon the exhaust back pressure measurement signal and at least one predetermined engine parameter, to thereby actuate the turbocharger nozzle;
• wherein the at least one predetermined engine parameter is vehicle speed, engine speed, engine load, engine temperature, or ambient air temperature.

A control system for a variable geometry turbocharger, having operatively connected turbine and compressor housings, for use in an internal combustion engine, the control system comprising:

• an exhaust back pressure sensor able to generate an exhaust back pressure measurement signal;
• a control device able to actuate a turbocharger nozzle;
• and
• a controller able to process the exhaust back pressure measurement signal and generate a control signal to the control device, based upon the exhaust back pressure measurement signal and at least one predetermined engine parameter, to thereby actuate the turbocharger nozzle;
• wherein the controller is an electronic control module, an engine microprocessor, or a turbocharger microprocessor.

A control system for a variable geometry turbocharger, having operatively connected turbine and compressor housings, for use in an internal combustion engine, the control system comprising:

• an exhaust, back pressure sensor able to generate an exhaust back pressure measurement signal;
• a control device able to actuate a turbocharger nozzle;
• and
• a controller able to process the exhaust back pressure measurement signal and generate a control signal to tie control device, based upon the exhaust back pressure measurement signal and at least one predetermined engine parameter, to thereby actuate the turbocharger nozzle;
• wherein the measurement signal is electronic, magnetic or optical.