Method for engine control
First Claim
1. A method of monitoring road speed of a vehicle having an electronic control unit for controlling a compression-ignition internal combustion engine with a plurality of sensors for sensing vehicle operating parameters and means for indicating an overspeed condition, the method comprising:
- sensing the road speed of the vehicle to obtain a road speed signal;
sensing the requested fueling level of the engine to obtain a requested fueling level signal;
comparing the road speed signal to a first parameter stored in the memory associated with a nonzero fueling level request;
comparing the road speed signal to a second parameter stored in the memory associated with a zero fueling level request;
initiating a variable time interval based upon at least one of the comparisons ; and
indicating an overspeed condition and storing at least one of the vehicle parameters in the memory when the variable time interval expires.
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Accused Products
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 injection strategy.
82 Citations
22 Claims
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1. A method of monitoring road speed of a vehicle having an electronic control unit for controlling a compression-ignition internal combustion engine with a plurality of sensors for sensing vehicle operating parameters and means for indicating an overspeed condition, the method comprising:
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sensing the road speed of the vehicle to obtain a road speed signal; sensing the requested fueling level of the engine to obtain a requested fueling level signal; comparing the road speed signal to a first parameter stored in the memory associated with a nonzero fueling level request; comparing the road speed signal to a second parameter stored in the memory associated with a zero fueling level request; initiating a variable time interval based upon at least one of the comparisons ; and indicating an overspeed condition and storing at least one of the vehicle parameters in the memory when the variable time interval expires. - View Dependent Claims (2)
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3. A method for monitoring road speed of a vehicle having an electronic control unit with an associated memory, the method comprising:
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monitoring a parameter indicative of road speed of the vehicle; monitoring an accelerator pedal signal to determine whether an accelerator pedal is being depressed or released; comparing the road speed to a threshold associated with the accelerator pedal being depressed; and generating a signal to alert an operator to an overspeed condition when the road speed exceeds the first threshold and the accelerator pedal being depressed. - View Dependent Claims (4)
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5. A method for monitoring road speed of a vehicle having an electronic control unit with an associated memory, the method comprising:
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monitoring a parameter indicative of road speed of the vehicle; monitoring an accelerator pedal signal to determine whether an accelerator pedal is being depressed or released; comparing the road speed to a threshold associated with the accelerator pedal being released; generating a signal to alert the operator to an overspeed condition when the road speed exceeds the threshold and the accelerator pedal being released. - View Dependent Claims (6)
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7. A computer readable storage medium having stored therein data representing instructions executable by an electronic control module to control operation of a vehicle, the storage medium comprising:
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instruction for monitoring a parameter indicative of road speed of the vehicle; instructions for comparing the road speed to a first threshold; instructions for stating a timer when the road speed exceeds the first threshold; instructions for generating a signal to alert as operator to an overspeed condition only after the timer expires and the road speed exceeds the first threshold. - View Dependent Claims (8, 9, 10)
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11. A method for monitoring road speed of a vehicle having an electronic control unit with an associated memory, the electronic control unit operative to control an internal combustion engine, the method comprising:
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monitoring a parameter indicative of speed of the vehicle; comparing the road speed to a first threshold; starting a timer when the road speed exceeds the first threshold; generating a signal to alert an operator to an overspeed condition when the road speed exceeds the first threshold only after the timer expires; and storing at least one value associated with the overspeed condition in memory. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for monitoring road speed of a vehicle having an electronic control unit with an associated memory, the electronic control unit operative to control an internal combustion engine, the method comprising:
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monitoring a parameter indicative of road speed of the vehicle; monitoring an accelerator pedal signal to determine whether an accelerator pedal is being depressed or released; comparing the road speed to a first threshold associated with the accelerator pedal being depressed; comparing the road speed to a second threshold associated with the accelerator pedal being released; generating a signal to alert an operator to an overspeed condition when the road speed exceeds the first threshold and the accelerator is being depressed; and generating a signal to alert the operator to an overspeed condition when the road speed exceeds the second threshold and the accelerator pedal is released. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification