Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1994-02-07
1995-11-28
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
123415, 123422, 36443108, F02P 514, F02P 5152
Patent
active
054702895
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method for smoothing out acceleration jerks of a motor vehicle propelled by an internal-combustion engine and, more particularly, to such a method enabling such jerks to be smoothed out in an acceleration phase from a steady state or after a deceleration phase.
FIG. 5B of the attached drawing shows the variation with time of various parameters connected with the engine or with the vehicle, following an abrupt acceleration requested by the driver at the instant t.sub.0. At this instant, the driver presses the accelerator pedal down which controls the opening of the throttle valve. Since the ignition-advance angle A of the engine is conventionally corrected in order to provide a maximum torque, the longitudinal acceleration of the vehicle is recorded with the aid of an accelerometer. On the recording of the output signal from this accelerometer, time oscillations of a substantial amplitude which are progressively damped are observed. These oscillations represent jerks which are disagreeably experienced by the driver. Thus it may be said that the level of driving comfort of the vehicle is lowered by these jerks.
The recorded oscillations of the acceleration arise from the "elasticity" of the kinematic system which goes from the engine to the wheels of the vehicle, in particular at the clutch disc and at the cardan joints. Too rapid an increase in the engine torque, requested by the driver during an acceleration, causes the system to oscillate, the oscillations produced being manifested for the driver by disagreeable jerks in the progression of the vehicle.
Ways have been sought to eliminate these jerks by controlling the engine torque at the start of acceleration. According to a first solution explained in French Patent Application No. 88 09056 filed in the name of BENDIX ELECTRONICS, the action of the accelerator pedal is neutralised over the angle of opening of the throttle valve in an initial zone of the travel of this pedal and the flow rate of air inducted into the engine is then regulated with the aid of a particular control law, in order to avoid jerks, but only in the case of low charges.
According to another solution described in French Patent Application No. 90 02633 in the name of SIEMENS AUTOMOTIVE S.A., the masses of air and of fuel entering the engine are controlled so as to constrain the latter to follow a behaviour defined by a model. It is then possible to optimise the response of the engine, including when transient accelerations are requested by the driver.
These solutions, which require the use of a throttle valve actuated by a motor, thus have the drawback of being expensive.
This drawback is overcome by the method for transient-state correction of the ignition advance of an internal-combustion engine described in French Patent Application No. 91 08585 filed on 9th Jul. 1991 by the Applicant. According to this method, on changing the gear ratio of a gearbox associated with the engine, jerks in the speed of this engine on reaccelerating are eliminated by correcting the ignition advance as a function of the time derivative of the induction pressure of the engine, substantially until leaving the transient state due to the gear-ratio change. The reacceleration is detected by the increase in the pressure at the induction manifold of the engine which results therefrom.
Although this method has given satisfactory results, there is still a need for a method for smoothing out the jerks which is based on a solid theoretical basis, enabling the method to be optimised.
The object of the present invention is therefore to provide a method for smoothing out acceleration jerks which is inexpensive to implement and may be applied to various situations in which an acceleration requested by the driver is liable to cause the jerks which lower the level of driving comfort of the vehicle.
The object of the present invention is also to provide such a method which is sustained by a theoretical basis allowing the process to be optimised.
These objectives of the invention are ach
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Dupont Henri
Martineau Dominique
Pioch Olivier
Greenberg Laurence A.
Jensen Nathan O.
Lerner Herbert L.
Marmor Charles A.
Siemens Automotive S.A.
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