Powertrain output monitor

A method for controlling an engine having at least one fuel injector responsive to a commanded fuel signal, the method comprising:

• determining a desired engine power;
• determining a first fuel flow value as a function of the desired engine power and engine speed;
• limiting the commanded fuel signal based on said fuel flow value;
• modulating the first fuel flow value to prevent fuel limiting during normal engine operation;
• and
• providing a static tolerance margin to said first fuel flow value, and providing a dynamic tolerance margin to said first fuel flow value.

In an internal combustion engine having at least one fuel injector responsive to a commanded fuel signal and an engine controller responsive to an accelerator pedal position input for generating a throttle position command and a first fuel flow value, a method of regulating the powertrain output comprising:

• determining a desired engine power by determining a first power value as a function of engine speed and a desired engine torque, determining a second power value as a function of turbine speed, driveline efficiency and a desired wheel power, and setting said desired engine power to the lesser of said first and second power values;
• determining a second fuel flow value as a function of the desired engine power and engine speed;
• modulating the second fuel flow value to prevent fuel limiting during normal engine operation;
• and
• generating the commanded fuel signal as a function of the first fuel flow value and modulated second fuel flow value.

A control system for an internal combustion engine responsive to an accelerator pedal position input, said engine including at least one fuel injector responsive to a commanded fuel signal, and a throttle responsive to a throttle position command signal, the controller comprising:

• an accelerator pedal position sensor for providing an accelerator pedal position value;
• a vehicle speed sensor for providing a vehicle speed value;
• a control unit including a microprocessor for receiving the accelerator pedal position value and vehicle speed value, the microprocessor programmed to perform the following steps:
• generate said throttle position command and a first fuel flow value as a function of said accelerator pedal position value and vehicle speed value;
• determine a desired engine power by determining a first power value as a function of engine speed and a desired engine torque, determining a second power value as a function of turbine speed, driveline efficiency and a desired wheel power, and setting said desired engine power to the lesser of said first and second power values;
• determine a second fuel flow value as a function of the desired engine power and engine speed;
• and
• limit said commanded fuel signal as a function of said first and second fuel flow values.

A control system for an internal combustion engine responsive to an accelerator pedal position input, said engine including at least one fuel injector responsive to a commanded fuel signal, and a throttle responsive to a throttle position command signal, the controller comprising:

• an accelerator pedal position sensor for providing an accelerator pedal position value;
• a vehicle speed sensor for providing a vehicle speed value;
• a control unit including a microprocessor for receiving the accelerator pedal position value and vehicle speed value, the microprocessor programmed to perform the following steps:
• generate said throttle position command and a first fuel flow value as a function of said accelerator pedal position value and vehicle speed value;
• determine a desired engine power;
• determine a second fuel flow value as a function of the desired engine power and engine speed;
• limit said commanded fuel signal as a function of said first and second fuel flow values;
• and
• modulate the second fuel flow value by providing a static tolerance margin to said second fuel flow value, and providing a dynamic tolerance margin to said second fuel flow value.