Internal-combustion engines – Spark ignition timing control – Electronic control
Patent
1998-07-20
2000-09-26
Kwon, John
Internal-combustion engines
Spark ignition timing control
Electronic control
12340627, 123643, 701102, F02P 500
Patent
active
06123057&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to an arrangement and process for communication between an ignition module mounted on an engine and the control unit in a combustion engine's ignition system.
STATE OF THE ART
In ignition systems with detection of the degree of ionisation in the combustion chamber, preferably via the spark plug gap, a number of combustion related parameters can be detected via the ionisation current. In the systems which are used in motor vehicles, e.g. in the SAAB 2.3 liter four-cylinder petrol engines, an amplified analogue signal in relation to the degree of ionisation is sent from an ignition module mounted on the engine, or ignition cassette, up to the ignition system's control unit. The knock intensity is then detected in the control unit via the filtering out of a representative frequency content in relation to the knock in the amplified analogue ionisation signal.
One risk with these systems is that the analogue information is sensitive to interference, and that a great deal of the information which exists in the ionisation signal can be lost during the amplification or signal processing before the signal is sent to the control unit.
One preference is therefore that the determination of the different combustion related parameters should be conducted as close to the engine as possible, i.e. in the ignition module/ignition cassette. Such a partitioning of the system, however, sets requirements on the transfer of information and the activation of the different detection processes, which detection processes must be activated at different times and in relation to the engine's actual load and speed. A natural arrangement would therefore be to introduce an individual signal wire between the control unit and ignition module for each of the different parameter values which are to be transferred, and individual signal wires for activation/triggering of the detection functions.
The invention has the objective of reducing the number of wires between an ignition module mounted on the engine and its control unit, where the ignition module can locally determine at least one of the parameters related to combustion, based on the detected degree of ionisation in the combustion chamber. By reducing the number of wires the ignition system can be made more reliable with the minimisation of the number of contact points, also achieving a reduction of the cabling costs. This is very important during the installation of electronics and additional cabling, above all in the exposed environment in an engine compartment of a motor vehicle.
A further objective is to enable a standardisation of the ignition module, where the ignition module contains all the means for determining at least one signal related to the combustion quality and one signal related to the knock intensity, but where all corrections and initiations of the detection in accordance with predetermined algorithms are determined in the control unit. Each ignition system can hereby be easily adjusted to different types of engines by modification in the control unit, but where the ignition module consists of a standardised unit in the ignition system. The combustion process can differ between different combustion engines, and also the requirements for combustion quality and permissible knock level can differ between different types of applications. This makes it necessary to adjust the detection strategies to different types of engines.
Yet another objective with a favourable design is that at least two signal processing stages can be activated at least partially in parallel and transfer at least partially in parallel different combustion related parameters on the respective communication wire.
SUMMARY
An arrangement and process in accordance with the present invention for accomplishing the foregoing and other objects includes providing a cable for communication between the control unit and the ignition module, the cable containing at least one individual trigger wire for each primary switch in the ignition module and o
REFERENCES:
patent: 4856489 (1989-08-01), Ozawa
patent: 4870587 (1989-09-01), Kumagai
patent: 5598821 (1997-02-01), Terata et al.
Goras Anders
Nytomt Jan
Kwon John
Mecel AB
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