Output torque control apparatus and method for an internal combustion engine
First Claim
1. An output torque control apparatus for an internal combustion engine comprising:
- a data processor unit programmed to perform the following functions;
an air fuel ratio controlling function for controlling an air fuel ratio of said internal combustion engine;
a lean limit air fuel ratio determining function for determining a lean limit air fuel ratio by detecting variation of an output torque of the internal combustion engine; and
a limit air fuel ratio comparing function for comparing the lean limit air fuel ratio with a limit air fuel ratio corresponding to a predetermined emission amount of a nitrogen oxide component in an exhaust gas from the internal combustion engine;
wherein said air fuel ratio controlling function controls the air fuel ratio based on a result of comparing the lean limit air fuel ratio with the air fuel ratio corresponding to said predetermined emission amount of a nitrogen oxide component.
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Accused Products
Abstract
The invention provides an output torque control method and apparatus for a lean burn internal combustion engine which accounts for aging of component parts, and in which no stepwise change of torque or shock occur when an air fuel ratio is changed. The method and apparatus according to the invention control an intake air amount while maintaining an emission purification function by controlling the air fuel ratio to that of a theoretical mixture (air fuel ratio of 14.7) in a case where a limit NOx emission is determined by using a detected air fuel ratio and lean burn operation becomes difficult due to the amount of NOx emissions. Abrupt change of an output torque when the air fuel ratio is changed is curtailed by controlling a fuel amount or an air amount after calculating the fuel amount or the air amount from an engine speed and an accelerator depression angle.
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Citations
58 Claims
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1. An output torque control apparatus for an internal combustion engine comprising:
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a data processor unit programmed to perform the following functions; an air fuel ratio controlling function for controlling an air fuel ratio of said internal combustion engine; a lean limit air fuel ratio determining function for determining a lean limit air fuel ratio by detecting variation of an output torque of the internal combustion engine; and a limit air fuel ratio comparing function for comparing the lean limit air fuel ratio with a limit air fuel ratio corresponding to a predetermined emission amount of a nitrogen oxide component in an exhaust gas from the internal combustion engine; wherein said air fuel ratio controlling function controls the air fuel ratio based on a result of comparing the lean limit air fuel ratio with the air fuel ratio corresponding to said predetermined emission amount of a nitrogen oxide component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An output torque control apparatus for an internal combustion engine comprising:
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an accelerator depression angle detector for detecting an accelerator depression angle; an engine speed detector for detecting an engine speed; and a data processor unit programmed to perform the following functions; an air fuel ratio controlling function for controlling an air fuel ratio of said internal combustion engine; and a fuel injection amount calculating function for calculating a fuel injection amount for switching the air fuel ratio in accordance with a value of a signal from the accelerator depression angle detecting function and a value of a signal from the engine speed detecting function. - View Dependent Claims (12, 13)
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14. An output torque control apparatus for an internal combustion engine comprising:
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an intake air amount detector for detecting an intake air amount for said internal combustion engine; an engine speed detector for detecting the engine speed of said internal combustion engine; an accelerator depression angle detector for detecting an accelerator depression angle; and a data processor unit programmed to perform the following functions; an air fuel controlling function for controlling an air fuel ratio of said internal combustion engine; a steady state fuel injection amount calculating function for calculating a first calculated value of a fuel injection amount, based on the intake air amount and the engine speed in a steady state operation in which the air fuel ratio stays constant; and an air fuel ratio switch time fuel injection amount calculating function for calculating a second calculated value of a fuel injection amount, based on the accelerator depression angle and the engine speed for switching the air fuel ratio. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An output torque control apparatus for an internal combustion engine comprising:
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an intake air amount detector for detecting an intake air amount of said internal combustion engine; an engine speed detector for detecting engine speed of said internal combustion engine; an accelerator depression angle detector for detecting an accelerator depression angle; a data processor unit programmed to perform the following functions; an air fuel ratio controlling function for controlling an air fuel ratio of said internal combustion engine; a steady state throttle opening degree calculating function for calculating a first calculated value of a throttle opening degree, based on the accelerator depression angle and the engine speed in a steady state operation in which the air fuel ratio stays constant; and an air fuel ratio switch time throttle opening degree calculating function for calculating a second calculated value of a throttle opening degree, based on a fuel injection amount and the engine speed for switching the air fuel ratio. - View Dependent Claims (21, 22, 23, 24, 25)
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26. An output torque control apparatus for an internal combustion engine comprising:
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an intake air amount detector for detecting an intake air amount for said internal combustion engine; an engine speed detector for detecting an engine speed of said internal combustion engine; an accelerator depression angle detector for detecting an accelerator depression angle; and a data processor unit programmed to perform the following functions; an air fuel ratio controlling function for controlling the air fuel ratio of said internal combustion engine; a steady state fuel injection amount calculating function for calculating a first calculated value of a fuel injection amount based on the intake air amount and the engine speed in a steady state operation in which the air fuel ratio stays constant; a steady state throttle opening degree calculating function for determining a first calculated value of a throttle opening degree, based on the accelerator depression angle and the engine speed; an air fuel ratio switch time fuel injection amount calculating function for calculating a second calculated value of a fuel injection amount, based on the accelerator depression angle and the engine speed in switching the air fuel ratio; and an air fuel ratio switch time throttle opening degree detecting function for determining a second calculated value for a throttle opening degree, based on a fuel injection amount and the engine speed. - View Dependent Claims (27, 28, 29)
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30. A method of controlling an output torque of an internal combustion engine comprising the steps of:
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determining a lean limit air fuel ratio by detecting variation of an output torque of an internal combustion engine; comparing the lean limit air fuel ratio with a limit air fuel ratio corresponding to a predetermined emission amount of a nitrogen oxide component in an exhaust gas of the internal combustion engine; and controlling the air fuel ratio based on a result of said comparing step. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method of controlling an output torque of an internal combustion engine, which method includes switching an air fuel ratio of the internal combustion engine, said method comprising the steps of:
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calculating a fuel injection amount for switching the air fuel ratio in accordance with a value of an accelerator depression angle and a value of an engine speed; and controlling fuel injection of said internal combustion engine based on said calculated fuel injection amount during switching of said air fuel ratio. - View Dependent Claims (41, 42)
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43. A method of controlling an output torque of an internal combustion engine, which method includes switching an air fuel ratio of the internal combustion engine, said method comprising the steps of:
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calculating a steady state fuel injection amount based on an intake air amount and an engine speed in a steady state operation wherein said air fuel ratio stays constant; calculating an air fuel ratio switch time fuel injection amount based on an accelerator depression angle and the engine speed for switching the air fuel ratio; and controlling fuel injection of said internal combustion engine based on one of said calculated steady state fuel injection amount and said air fuel ratio switch time fuel injection amount. - View Dependent Claims (44, 45, 46, 47, 48)
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49. A method of controlling an output torque of an internal combustion engine, which method includes switching an air fuel ratio of the internal combustion engine, said method comprising the steps of:
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calculating a throttle opening degree based on accelerator depression angle and an engine speed in a steady state operation in which the air fuel ratio stays constant; calculating throttle opening degree based on a fuel injection amount and the engine speed, for switching the air fuel ratio; and controlling said throttle opening degree based on a result of one of said calculating steps. - View Dependent Claims (50, 51, 52, 53, 54)
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55. A method of controlling an output torque of an internal combustion engine, which method includes switching an air fuel ratio of the internal combustion engine, said method comprising the steps of:
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calculating a fuel injection amount based on an intake air amount and an engine speed of said internal combustion engine; determining a throttle opening degree based on an accelerator depression angle and the engine speed in a steady state operation in which the air fuel ratio stays constant; calculating a fuel injection amount based on the acceleration depression angle and the engine speed; and controlling throttle opening degree based on the fuel injection amount and the engine speed for switching the air fuel ratio. - View Dependent Claims (56, 57, 58)
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Specification