Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2000-03-13
2001-07-31
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C073S035010, C123S406550, C701S111000
Reexamination Certificate
active
06267100
ABSTRACT:
BACKGROUND INFORMATION
German Patent No. 3 420 465 describes a device for suppressing engine knocks. In this known device, the operating parameters of the internal combustion engine are ascertained, and the respective manipulated variables for the processes to be controlled, such as ignition and injection, are determined in a control unit on the basis of these acquired operating parameters. Thus, for example, the optimal ignition firing point is calculated on the basis of speed and acting load. In the known device, provision is also made for a knock detector which determines the combustion noises individually for each cylinder. The signals from the knock detector are forwarded to a knock-signal evaluation circuit, and after filtering out the background noises, are compared there to a reference level. If a knocking combustion has been detected, then to suppress knocking, the ignition firing point in this cylinder, determined on the basis of speed and load, is retarded, thus is adjusted away from the knock limit. After a specifiable number of knock-free combustions, this altered ignition firing point is again brought forward step-wise to the manipulated variable determined by the control unit. Since there is no danger of knocking combustions when the engine is cold, it is customary to switch the knock control to the active state only after reaching a specifiable engine temperature, thus after the warm-up of the internal combustion engine. Below this enabling temperature, it is certain that no knocking can occur, since the thermal conditions in the combustion chamber do not allow it. In the known systems, the engine coolant temperature is determined for ascertaining the engine temperature.
SUMMARY OF THE INVENTION
Compared to the known device, the device of the present invention in which the knock control is enabled as a function of the gas inlet temperature into the combustion chamber—has the advantage that precise information about the actual thermal conditions in the combustion chamber can prevent the knock control from being switched on too early, thus avoiding unnecessary or incorrect interventions of the knock control, which in turn results in improved efficiency.
It is advantageously possible to simulate the inlet temperature from a number of measured quantities such as of the engine temperature and the intake-air temperature, from the exhaust-gas recirculation temperature, the air-mass flow and the exhaust-gas recirculation rate. No additional sensors are necessary in doing this, since these temperatures are already determined anyway in the case of modern control devices, making this design approach particularly cost-effective.
A second possibility is also to make provision directly at the intake valve for a temperature sensor which, for example, can be structurally joined to the intake valve. This presents the possibility of the control device needing no additional computing capacity.
In general, the direct acquisition of the gas-inlet temperature, or determining the gas-inlet temperature with the aid of a model, makes it possible to rule out disturbance noises because of the motor oil which is still cold, and thus to rule out falsely detected knocking. Thus, the retard of the ignition-advance angle is not unjustifiably activated, which in turn means an increase in traveling comfort and efficiency.
REFERENCES:
patent: 4265206 (1981-05-01), Giampaolo
patent: 4586474 (1986-05-01), Masahira
patent: 4763625 (1988-08-01), Staerzl et al.
patent: 5150682 (1992-09-01), Jean-Louis
patent: 5235952 (1993-08-01), Takasuka et al.
patent: 5373448 (1994-12-01), Kozo et al.
patent: 02 211 381 (1990-08-01), None
Baeuerle Michael
Franke Steffen
Haeming Werner
Kluth Carsten
Torno Oskar
Argenbright Tony M.
Kenyon & Kenyon
Robert & Bosch GmbH
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