Apparatus for an internal combustion engine

Details Apparatus for an internal combustion engine Apparatus for an internal combustion engine

1996-08-23

1998-02-17

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123337, F02D 910, F02D 1110

Patent

active

057182027

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention is based on an electronic control apparatus for an internal combustion engine. An apparatus is already known (European Patent EP 0 317 813) that has a throttle device in the form of a throttle valve that is rotatably accommodated in a throttle valve housing. For adjusting the throttle valve, an electric throttle valve control motor is provided, which rotates the throttle valve via a step-down gear. Such electric-motor-driven apparatuses are part of an electronic engine management system (EMS) for internal combustion engines, in which an electronic control unit evaluates the position of an accelerator pedal, detected by a pedal travel sensor, in order to trigger the electric throttle valve control motor in accordance with the pedal position so that the throttle valve assumes a predetermined rotary position. The electronic engine management system (EMS) is capable of purposefully varying the rotary position of the throttle valve as a function of various engine operating parameters. This makes it possible, among other effects, to adapt the engine torque in a meterable way, so that it is also possible to perform so-called traction control (ASR). In the traction control (ASR), the driver demand, expressed by the position of the accelerator pedal, is corrected so that in starting, spinning of the engine-driven wheels of a motor vehicle is prevented by purposefully pulling back the rotary position of the throttle valve.
The electronic engine management system (EMS) is part of an overall electronic engine control system, which besides its main functions of mixture forming and electric ignition also controls the introduction of fuel vapors into the throttle valve housing by means of a regenerating valve. The regenerating valve is part of a fuel vapor trapping system of a fuel tank of the engine, in which the fuel vapors of a fuel tank are for instance initially stored temporarily in an adsorption filter and then introduced into the throttle valve housing by means of the regenerating valve.
The engine control system requires a great deal of information about important engine operating variables, which are furnished by sensors and delivered to the electronic control unit for evaluation. One important sensor is known as an air flow rate meter, which determines the mass of air in the throttle valve housing aspirated by the engine. The engine control system has a plurality of individual components, which essentially include the electronic control unit, the throttle device, the throttle valve control motor, the regenerating valve, and the air flow rate meter. Until now, these individual components have been accommodated individually in separate housings, for example on the engine in the engine compartment, or in the passenger compartment of the motor vehicle, so that many electrical connection lines and plug connections are needed to connect the individual components, especially to the electronic control unit.


ADVANTAGES OF THE INVENTION

The apparatus of the invention for an internal combustion engine has the advantage over the prior art that a compact component is created that can be manufactured economically and that in particular, as a prefabricated and pretested component, is simple to mount on the motor vehicle. Because of the elimination of otherwise usual single housings and their electrical connecting lines and electrical plug connections, further cost savings are advantageously achieved. Moreover, the operating safety and reliability of the apparatus is increased because of the reduced number of electrical connecting lines and electrical plug connections.
Advantageous further features of and improvements to the apparatus are possible as a result of the provisions recited hereinafter.


BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail below. FIG. 1 is a perspective view of an apparatus in accordance with a first exemplary embodiment of the invention; FIG. 2 is a side view of the

REFERENCES:
patent: 4766869 (1988-08-01), De Concini et al.
patent: 4926821 (1990-05-01), Porth et al.
patent: 4991560 (1991-02-01), Arai et al.
patent: 4995369 (1991-02-01), Cook

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