Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-06-09
2000-03-14
Kwon, John
Internal-combustion engines
Charge forming device
Fuel injection system
123493, F02M 5100
Patent
active
060358319
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to a method for influencing fuel metering in an internal combustion engine.
BACKGROUND INFORMATION
The German Patent No. 41 15 211 discloses an electronic control system for metering fuel in an internal combustion engine. In the known system, a basic injection quantity signal is gated with a transition-compensation signal to adapt the metered fuel quantity in response to acceleration and deceleration. In determining the transition-compensation signal, inter alia a wall-film quantity signal, as well as a series of correction signals are considered.
An object of the present invention is to further improve the known system. In particular, the present invention should make it possible to observe a desired air/fuel ratio with the greatest possible accuracy and in the greatest possible number of operating states of the internal combustion engine.
SUMMARY OF THE INVENTION
The present invention has the advantage of enabling an optimal fuel metering in the dynamic operation of the internal combustion engine.
This is achieved by taking one or a plurality of signals into consideration which describe the heat flow toward or away from the intake section.
In known methods heretofore, setting parameters for the fuel metering entailed finding a compromise between various operating states, e.g., high/low ambient temperature or high/average vehicular speed level. By taking these influences on the wall-film characteristics into consideration, an optimal air/fuel mixture can be achieved for these states in transient operation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a schematic representation of an internal combustion engine comprising essential components for controlling the fuel metering.
FIG. 2 shows a block diagram for clarifying how the fuel metering is influenced using the method according an embodiment of the present invention.
FIG. 3 shows a variant of the block diagram shown in FIG. 2.
FIG. 4 shows a flow chart of the an embodiment of method according to the present invention.
DETAILED DESCRIPTION
FIG. 1 is a schematic representation of an internal combustion engine 100 and essential components for controlling fuel metering in an open or closed loop. By way of an intake section 102, an air/fuel mixture is supplied to internal combustion engine 100, and the exhaust gases are released into an exhaust duct 104. Viewed in the flow direction of the intake air, mounted in intake section 102 are an air-flow sensor or mass air-flow sensor 106, for example a hot-film air-mass meter, a temperature sensor 108 for detecting intake-air temperature, a throttle valve 110 with a sensor 111 for detecting the opening angle of throttle valve 110, a pressure sensor 112 for detecting the pressure in intake section 102, and at least one injection nozzle 114. As a rule, air-flow sensor or mass air-flow sensor 106, and pressure sensor 112 are alternatively provided. Mounted in exhaust duct 104 is an oxygen probe 116. Mounted on internal combustion engine 100 are an engine speed sensor 118 and a sensor 119 for detecting the temperature of the internal combustion engine. Internal combustion engine 100 has, for example, four spark plugs 120 for igniting the air/fuel mixture in the cylinders. Also shown in FIG. 1 are a sensor 122 for detecting vehicular speed and an electromotor 124, which drives a fan arranged in the engine compartment.
The output signals from the described sensors are transmitted in a central control unit 126. In particular, the signals are: a signal m from air-flow sensor or mass air-flow sensor 106, a signal TAn from temperature sensor 108 for detecting the intake-air temperature, a signal .alpha. from sensor 111 for detecting the opening angle of throttle valve 110, a signal PS from pressure sensor 112 downstream from throttle valve 110, a signal .lambda. from oxygen sensor 116, a signal n from speed sensor 118, a signal TMot from sensor 119 for detecting the temperature of internal combustion engine 100, and a signal v from sensor 122 for detecti
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patent: 5584277 (1996-12-01), Chen et al.
patent: 5647324 (1997-07-01), Nakajima
patent: 5829247 (1998-11-01), Zhang
Reuschenbach Lutz
Stuber Axel
Veil Hans
Kwon John
Robert & Bosch GmbH
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