Method for engine control
First Claim
1. A method of controlling a compression-ignition internal combustion engine including an electronic control unit with memory for controlling the engine, a plurality of combustion cylinders each having an integral fuel pump-injector apparatus for delivering fuel to the cylinders, and a plurality of sensors for sensing engine operating parameters, the method comprising:
- sensing a plurality of engine operating parameters to obtain associated operating signals;
determining a desired engine output torque based on the operating signals;
identifying a pilot output torque based on the operating signals and a main output torque based on the pilot output torque and the desired output torque according to;
space="preserve" listing-type="equation">Tq.sub.1 =min(Tq.sub.des,Tq.sub.pilot)and
space="preserve" listing-type="equation">Tq.sub.2 =Tq.sub.des -Tq.sub.1wherein Tq1 represents the pilot output torque, Tq2 represents the main output torque, "min()" represents the lesser of the parenthetical values, Tqdes represents the desired output torque, and Tqpilot represents a desired value for the pilot output torque for the cylinder being fired;
determining first and second quantities of fuel to produce the pilot output torque and the main output torque, respectively;
calculating a period to pause between delivery of the first and second quantities of fuel based on the operating signals;
determining a starting time for delivery of the first quantity of fuel based on the operating signals; and
consecutively controlling each of the integral fuel pump-injector apparatus so as to deliver the first quantity of fuel to the associated combustion cylinder, pause for the calculated period, and deliver the second quantity of fuel to the associated combustion cylinder.
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Abstract
A method for comprehensive integrated control of a compression-ignition internal combustion engine having integral fuel pump-injectors utilizing an electronic control unit is disclosed. The control strategy integrates various functions of engine control including fuel delivery, cooling fan control, engine speed governing and overspeed protection, engine braking, torque control, and vehicle speed diagnostics and control. Cooling fan control is integrated with vehicle speed diagnostics and control as well as fuel delivery to provide an integrated cruise control function which incorporates engine braking. The method also includes improved control over the various engine speed governors while improving idle quality by balancing the power delivered by each of the engine cylinders when at idle. The integrated torque control employs functions to reduce NOx emissions and noise utilizing adaptive fuel delivery timing and a split injection strategy.
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Citations
16 Claims
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1. A method of controlling a compression-ignition internal combustion engine including an electronic control unit with memory for controlling the engine, a plurality of combustion cylinders each having an integral fuel pump-injector apparatus for delivering fuel to the cylinders, and a plurality of sensors for sensing engine operating parameters, the method comprising:
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sensing a plurality of engine operating parameters to obtain associated operating signals; determining a desired engine output torque based on the operating signals; identifying a pilot output torque based on the operating signals and a main output torque based on the pilot output torque and the desired output torque according to;
space="preserve" listing-type="equation">Tq.sub.1 =min(Tq.sub.des,Tq.sub.pilot)and
space="preserve" listing-type="equation">Tq.sub.2 =Tq.sub.des -Tq.sub.1wherein Tq1 represents the pilot output torque, Tq2 represents the main output torque, "min()" represents the lesser of the parenthetical values, Tqdes represents the desired output torque, and Tqpilot represents a desired value for the pilot output torque for the cylinder being fired; determining first and second quantities of fuel to produce the pilot output torque and the main output torque, respectively; calculating a period to pause between delivery of the first and second quantities of fuel based on the operating signals; determining a starting time for delivery of the first quantity of fuel based on the operating signals; and consecutively controlling each of the integral fuel pump-injector apparatus so as to deliver the first quantity of fuel to the associated combustion cylinder, pause for the calculated period, and deliver the second quantity of fuel to the associated combustion cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of controlling a compression-ignition internal combustion engine including an electronic control unit with memory for controlling the engine, a plurality of combustion cylinders each having an integral fuel pump-injector apparatus for delivering fuel to the cylinders, and a plurality of sensors for sensing engine operating parameters, the method comprising:
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sensing a plurality of engine operating parameters to obtain associated operating signals; determining a desired engine output torque based on the operating signals; identifying a pilot output torque based on the operating signals and a main output torque based on the pilot output torque and the desired output torque according to;
space="preserve" listing-type="equation">Tq.sub.1 =min(Tq.sub.des,Tq.sub.pilot)and
space="preserve" listing-type="equation">Tq.sub.2 =Tq.sub.des -Tq.sub.1Tq1 represents the pilot output torque, Tq2 represents the main output torque, "min()" represents the lesser of the parenthetical values, Tqdes represents the desired output torque, and Tqpilot represents a desired value for the pilot output torque for the cylinder being fired; determining first and second quantities of fuel to produce the pilot output torque and the main output torque, respectively; determining a pulse width adjustment factor for eacy cylinder for modifying the first and second quantities of fuel based at least one of the plurality of operating signals; calculating a period to pause between delivery of the first and second quantities of fuel based on the operating signals; determining a starting time for delivery of the first quantity of fuel based on the operating signals; and consecutively controlling each of the integral fuel pump-injector apparatus so as to deliver the first quantity of fuel to the associated combustion cylinder, pause for the calculated period, and deliver the second quantity of fuel to the associated combustion cylinder. - View Dependent Claims (15, 16)
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Specification