Process for controlling a direct-injection internal combustion e

Details Process for controlling a direct-injection internal combustion e Process for controlling a direct-injection internal combustion e

1997-03-12

1998-07-07

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123486, F02D 4300, F02D 4102

Patent

active

057752958

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a process for controlling an internal combustion engine, particularly suited to a two- or four-stroke direct-injection engine.
2. Description of the Preferred Art
A process for controlling a direct-injection, spark-ignition engine is known from the prior art, for example from French patent application FR 2,657,398, wherein the degree of depression of the accelerator pedal and the speed of the engine are detected so that parameters for the optimal adjustment of the engine may be drawn from them, which parameters include, among other things, the duration of the fuel injection phase as well as the angle of opening of a motorized intake valve. This type of control offers numerous of advantages, but is very sensitive to the selection of adjustment parameters as well as to their potential deviation due to changes in the characteristics of the components of the system over time. For example, the permeability of the air intake assembly (filter, valve, pipes, etc.) can vary over time or from one engine to the next. This can cause a variation in the air supply, and thus in the combustion richness, and can result in an increase in pollution. In order to prevent this, the Applicant has proposed a process and a device for adjusting this combustion richness using a probe for measuring the richness of the exhaust gasses. However, in addition to the added cost of this probe, other drawbacks due to transient phenomena can subsist. In effect, with a rapid action of the accelerator pedal, the computer transmits the corresponding commands to the actuators instantaneously. However, these commands, as well as the phenomena they control, do not all have the same response time. For example, the injectors and the quantity of fuel they deliver occur ahead of the opening of the intake valve. This offset is further accentuated by the lag in the air supply due to the capacity of the intake manifold. Because of this, the richness obtained can deviate from the optimum richness can occur and can generate the emission of pollutants.
Therefore, the object of the present invention is to eliminate these drawbacks of the systems of the prior art by taking into account changes in the air supply, without relinquishing the advantages offered by these systems in the control of direct-injection engines.


SUMMARY OF THE INVENTION

These objects of the invention, as well as others which will become apparent later in the present description, are achieved by means of a process for controlling a direct-injection internal combustion engine of the type which uses a measurement of the degree of depression of the accelerator pedal and a measurement of the rotation speed of the engine to supply parameters for the optimal adjustment of this engine, according to which a table is established during the initial adjustment of the engine, which table represents for each combination (degree of depression, speed), the prevailing pressure/temperature ratio of the air in the intake manifold under stabilized operation; the pressure and the temperature of the intake air are measured under normal operation; the measured pressure/temperature ratio is calculated; and the table and at least one of the measurements taken is used to deduce at least one of the parameters for the optimal adjustment of the engine.
According to a first mode of execution of the process, a set point value for the pressure/temperature ratio of the intake air is determined in the table from the speed and the degree of depression measured, and the angle of opening of a throttle valve placed in the intake manifold is adjusted so as to bring the measured pressure/temperature ratio to this set point value.
According to a second mode of execution of the process, by means of an inverse reading of the table, a virtual degree of depression of the accelerator pedal is determined from the speed and the pressure/temperature ratio measured, and this virtual degree of depression is used to supply at least one of the paramete

REFERENCES:
patent: 4760825 (1988-08-01), Morita
patent: 4799467 (1989-01-01), Ishikawa et al.
patent: 5349932 (1994-09-01), Boverie et al.
patent: 5526787 (1996-06-01), Pallett

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