Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1994-06-28
1996-01-09
Nelli, Raymond A.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
F02D 4100
Patent
active
054820197
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an engine control system with a motorized butterfly body for a motor vehicle internal combustion engine equipped with a fuel injection system.
2. Description of the Prior Art
In the most conventional fuel injection systems currently equipping motor vehicle spark ignition internal combustion engines, at least one shut off member, termed butterfly, mounted so that it can pivot on a spindle in a duct of a butterfly body is connected to the accelerator pedal by a cable-operated mechanical transmission making it possible to regulate the angular position of the butterfly in the duct in order to cause the flowrate of intake air to the engine to vary, as a function of the demand from the driver. Simultaneously, modern spark ignition engines are equipped with an electronic control and monitoring unit, termed engine control unit, which comprises a computer and which has the function of controlling and monitoring the operation of the ignition circuit and of the fuel injection circuit of the engine. This engine control unit is connected to several sensors for sensing operating parameters of the engine, from which it receives signals which represent in particular the engine speed, the position of the shaft of the engine, the air pressure in the intake manifold, as well as possibly the temperature of the air and the temperature of the water in the cooling circuit, without this list being limiting. On the basis of the signals received from the sensors to which this engine control unit is connected, as well as possibly on the basis of data recorded in memories of this unit, the latter formulates orders for controlling the ignition and injection circuits, which it transmits to actuators of these circuits, such as the windings of injectors, a fuel pump, and ignition coils, in order to activate them. So that the operation of the ignition and injection circuits can be controlled suitably, under certain configurations of use of the engine, particularly during cold starts and when operating at low idle, as well as in a way which is coherent with the control of the air supply circuit, so that it results from the demand from the driver, the angular position of the butterfly is detected by a sensor transmitting a corresponding signal to the engine control unit, which takes this signal into account not only to formulate the control signals which it transmits to the actuators of the ignition and injection circuits, but also to formulate a control signal which it transmits to an actuator, such as an electric stepper motor for maneuvering a valve, mounted in an air intake circuit as a bypass round the butterfly, for the phases for which the engine is starting-up and operating at low idle.
Moreover, it is also known how to equip motor vehicles with installations for safety or driver comfort, for example with a system for preventing wheelspin, a system for preventing the wheels from locking up, or even with a system for setting the speed of the vehicle to a speed chosen by the driver. Each of these systems also comprises an electronic control and monitoring unit, which receives information from appropriate sensors, witnessing the operating state of the vehicle and of some of its components, and which prepares, on the basis of this information, control orders transmitted to appropriate actuators. For each of the particular systems mentioned hereinabove, one of the appropriate actuators is an actuator, for example an electric motor, which regulates the angular position of the butterfly, in parallel with the mechanical control by means of cable connecting this butterfly to the accelerator pedal, the actuator for the system preventing wheelspin or for the antilock system having, for obvious reasons of safety, priority over the control exerted by the driver by action on the accelerator pedal.
However, outside the periods for which the safety systems (antiwheelspin, antilock) intervene, the regulation of the air taken in remains under the direct control of the dri
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Ausiello Francesco P.
Quelenis Olivier
Wallerand Philippe
Nelli Raymond A.
Solex
Weber SRL
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