Internal-combustion engines – Charge forming device – With fuel pump
Patent
1995-06-01
1996-05-07
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
With fuel pump
12317917, 123198DB, F02D 4130, F02D 4106
Patent
active
055136141
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention starts from a method for filling the fuel supply system in an internal combustion engine in accordance with the generic type of the main claim.
In fuel supply systems of internal combustion engines the electric fuel pump is usually activated with the aid of the control unit. On starting-up, the fuel pump operates as long as the control unit recognizes that the starter switch is actuated. If the engine has started running, the pump remains switched on. A protective circuit avoids the delivery of fuel when the ignition is switched on and the engine is dead, for example after an accident.
After a repair or after an injection system has been installed in a motor vehicle, the fuel circuit of the internal combustion engine has to be refilled. This filling should take place without starting the internal combustion engine in order to prevent catalyst damage due to lean combustion at the beginning of operation of the internal combustion engine.
Since, however, prolonged operation of the fuel pump without starting the internal combustion engine or without it being in operation should be avoided so that, in the event of an accident, the escape of relatively large amounts of fuel, for example from burst fuel lines, is avoided, an operation of this type has to be prevented. Furthermore, such an operating restriction is selected so that, when the ignition is switched on, accidents, for example due to fuel lines not being connected after repairs to the fuel circuit, are prevented.
The object of the invention consists in implementing these two inherently contradictory demands of a desired, long pump preliminary operation time for filling the circuit and a short pump preliminary operation time in normal operation without costly and complex intervention in the control system of the internal combustion engine being required.
Advantages of the Invention
The method, according to the invention, with the features of claim 1 has the advantage that reliable filling of the fuel circuit of the internal combustion engine is achieved without starting of the internal combustion engine being required. It is furthermore ensured that, on normal starting of the internal combustion engine, a short preliminary operation time of the fuel pump is obtained and, at the same time, it is ensured that, in the event of an accident, the delivery of fuel is rapidly stopped, so that inadvertent escape of fuel is avoided.
These advantages are achieved by the control device, which carries out the activation of the electric fuel pump, recognizing, from measured variables such as, for example, rotational speed of the internal combustion engine, throttle-valve angle, position of the ignition switch, whether the start is normal or whether filling of the fuel supply system of the internal combustion engine should take place.
In addition, it is ascertained whether the engine temperature and initial air temperature are approximately the same and are within a certain range (for example 20.degree.-30.degree. C.).
As a function of this recognition, the control device advantageously implements either a normal activation of the electric fuel pump or a time control of the electric fuel pump. This time control can be terminated in a particularly advantageous manner by the control unit when specifiable conditions occur and a transfer to the normal activation of the electric fuel pump can take place.
By evaluation of the throttle-valve position unambiguous conditions can be realized, using which the control device can reliably recognize which operation is desired. If the desire for "filling of the system" has been recognized, then a repeated filling of the system is no longer possible.
Further advantages of the method according to the invention are achieved by the measures specified in the subclaims.
DRAWING
The invention is illustrated in the drawing and is explained in more detail in the description which follows. In the drawing, FIG. 1 shows a rough overview of the fuel supply system of all internal combustion engine including the means
REFERENCES:
patent: 5044344 (1991-09-01), Tuckey et al.
patent: 5179920 (1993-01-01), Bender
patent: 5179922 (1993-01-01), Bartholomew
patent: 5291578 (1994-03-01), Kalami
patent: 5293299 (1994-03-01), Iwabuchi et al.
patent: 5313923 (1994-05-01), Takeuchi et al.
patent: 5345915 (1994-09-01), Schmitz-Huebsch
Franzke Klause
Gras Juergen
Lang Eberhard
Moulis Thomas N.
Robert & Bosch GmbH
Striker Michael J.
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