Arrangement for detecting input signals of a control device in a

Details Arrangement for detecting input signals of a control device in a Arrangement for detecting input signals of a control device in a

1988-06-09

1991-01-01

Lall, Parshotam S.

Boots, shoes, and leggings

36443107, 364565, 123414, 123480, G01F 776

Patent

active

049823302

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention proceeds from an arrangement for determining actuating and control variables of an internal combustion engine. An arrangement is known from DE-OS 30 09 627 in which a multitude of output variables are calculated and made available from a multitude of input variables by means of an electronic device. In so doing, the input variables are continuously detected. The continuously detected input variables are sensed in constant time intervals in a computer-controlled manner and used for the calculation of the output variables. The rate of rotation and position of the crankshaft are detected in the known device by means of a resolver. This method of speed detection is expensive, costly and, above all, susceptible to disturbances, so that its use for controlling an internal combustion engine is unsatisfactory.
In addition, an arrangement is known from DE-OS 33 36 028 which counteracts the jarring which is brought about chiefly in diesel engines because of finite computing times, in that a separate control arrangement for proportioning fuel is provided for each cylinder. However, this control arrangement can only work in a satisfactory manner if the controlling devices provide very accurate and current speed information. In the case of an engine with Z-cylinders, a segmented wheel comprising Z-segments is arranged on the crankshaft for this purpose in the known arrangement. This solution entails considerable signal detection times which, in connection with the computer running time, can have disadvantageous consequences for the dynamics of the control arrangement.
It is the object of the invention, therefore, to make it possible to determine the speed at the latest possible point in time prior to the next fuel injection using an inductive or comparable pulse generator and a tested sensing arrangement.


ADVANTAGES OF THE INVENTION

In contrast to the aforementioned prior art, the arrangement, according to the invention, has the advantage that it is possible to determine the speed in a manner which is less costly and less susceptible to disturbance by using an incremental wheel in connection with an inductive pulse generator and the tested sensing arrangement. The phase rotation in the control circuit is minimized and the dynamic behavior is accordingly decisively improved by means of the shortest possible time interval between the detection of the speed signal and the output of the control signals.


DRAWING

The following drawings show an embodiment example of the invention. FIG. 1 shows a block circuit diagram including the elements necessary for actuating or controlling the operating variables of the internal combustion engine; FIG. 2 shows the increment transmitter with the respective sensor, the increment transmitter being constructed as a toothed wheel; FIGS. 3A, 3B and 3C show a time diagram with control signal for a solenoid valve, speed sensor signals and the cam lift; and FIG. 4 shows a flow chart of the process.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

In FIG. 1, an electronic control device is designated by 10 and contains a characteristic field, designated by 13, for the determination of the fuel quantity in the diesel engine or the basic injection period in the gasoline engine, a characteristic field, designated by 12, for some limit or correction values, and a microcomputer, designated by 11. The characteristic fields 12 and 13 can also be connected with one another via a data line, but are also connected with the microcomputer 11. The signals of the accelerator position transmitter 14, the speed transmitter 15 and the temperature transmitters 16 and 17 are fed to the control device 10. Other operating parameters are supplied to the control device via the line 18, e.g. boost pressure or air pressure. The output of the control device is connected with various end stages 20 whose output signals serve to control the actuating devices 21. The actuating devices are, for example, a solenoid valve at a diesel fuel pump or fuel injection nozzles in the gasoline engine. The shown a

REFERENCES:
patent: 4354239 (1982-10-01), Kanegae
patent: 4365602 (1982-12-01), Stiller et al.
patent: 4442812 (1984-04-01), Mizuno et al.
patent: 4639870 (1987-11-01), Otobe et al.
patent: 4702213 (1987-10-01), Yasuoka
patent: 4751650 (1988-06-01), Wazaki et al.
patent: 4797827 (1989-01-01), Cockerham
patent: 4825373 (1989-04-01), Nakamura et al.

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