Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Reexamination Certificate
2000-06-22
2001-11-06
Kwon, John (Department: 3747)
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
C123S361000
Reexamination Certificate
active
06311670
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for correction of control parameters of an internal combustion engine of a motor vehicle in order to eliminate the potential phenomena known as torque jolts that can occur during particular vehicle operating conditions.
2. Discussion of the Background
It is known that, under certain operating conditions of a motor vehicle equipped with an internal combustion engine, especially in transition phases (such as hard acceleration, etc.), there occur phenomena of oscillations of the torque transmitted to the vehicle wheels, or in other words jolts, these jolts then affecting the comfort of the vehicle passengers.
These oscillations originate mainly from the kinematic chain connecting the engine to the tire/road interface. In fact, the mechanical energy at the end of the crankshaft is transmitted to the wheels by a transmission system which traditionally comprises a clutch, a gearbox and a differential, each of these elements having its own damping and stiffness. As a result, any abrupt variation of the engine torque in the crankshaft region is transmitted to the wheels as oscillations whose amplitude will depend on the characteristics of the transmission system.
Numerous methods for remedying these torque oscillations have been conceived. Thus it is known from the prior art, especially from European Patent Application EP A 461504 and World Patent Application WO A 90/06441, that the torque of an engine can be regulated in such a way as to reduce or suppress the sensation of torque oscillations experienced by the vehicle operator.
According to this known prior art, the engine control parameters, or in other words the injection time or the ignition advance, are corrected to eliminate the oscillations by performing monitoring of the engine torque at the wheels and by correcting in the control loop the value of the chosen control parameter or parameters as a function of the amplitude of the detected oscillations.
Such methods nevertheless suffer from certain disadvantages, especially that of causing increased pollutant emission, since the main object of the corrections made is to reduce the engine torque by lowering combustion quality.
In addition, the known methods are limited to correcting the consequences of an abrupt torque variation after its occurrence has been recorded and identified, without acting on the cause thereof, or in other words abrupt variation of the air flow.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to propose a process for correction of the control parameters of an internal combustion engine in order to eliminate the torque jolts, which process remedies the disadvantages of the prior art while being particularly simple to implement.
The process according to the invention for correction of torque jolts relates more particularly to an internal combustion engine provided with an electronic engine control system which determines the values of engine control parameters as a function of engine operating conditions. This process is of the type by which at least one control parameter (&agr;PAP) is corrected in response to oscillations of the engine torque.
According to the invention, the process for correction of torque jolts is characterized in that it comprises the following stages:
calculation of the value of the said control parameter directly as a function of accelerator pedal position;
determination of the correction to be applied to this control parameter by filtering of the speed of revolution of the engine shaft.
Thus the process according to the present invention deals directly with the primary source of torque jolts, or in other words the abrupt variations of the accelerator pedal, which ordinarily generate corresponding abrupt variations of the air flow or of the fuel flow and thus abrupt variations of torque. By eliminating the perturbations at the source and by taking into account the evolution of engine speed, better compensation for torque jolts is achieved.
According to another characteristic of the process according to the invention for correction of torque jolts, the control parameter corrected in response to oscillations of the engine torque is the opening position of the gas throttle.
According to another characteristic of the process according to the invention for correction of torque jolts, calculation of the value of the said control parameter as a function of the accelerator pedal position is achieved on the basis of an adapted progressive adjustment formula.
According to another characteristic of the process according to the invention for correction of torque jolts, the progressive adjustment formula depends on values of the characteristic parameters of engine operation and/or on the rate of depression of the accelerator pedal.
According to another characteristic of the process according to the invention for correction of torque jolts, filtering of the existing engine speed is performed by a filter of the filtered second derivative type with variable gain and time constant.
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Kwon John
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Renault
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