Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1987-10-06
1988-12-27
Miller, Carl Stuart
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123479, 123198D, F02M 3900
Patent
active
047933089
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an emergency control device. In the known device according to DE-OS No. 31 30 094, the microcomputer and/or the controlling means can be bridged. In case of faulty operation of the signal processing unit, the position signal of the accelerator is switched more or less directly to the controlling means in order to control the controlling unit for the volume-determining member. Accordingly, an emergency driving operation is also ensured in case of faulty operation, which can be influenced, to a great extent, only by the driver of the vehicle equipped with the internal combustion engine. Moreover, an emergency control device is known from DE-OS No. 32 38 191 in which the signals of the speed transmitter, the accelerator position transmitter and the boost pressure transmitter are made use of for maintaining the emergency driving operation. The signal of the boost pressure transmitter serves primarily to place a ceiling on the required fuel quantity and, thus, to ensure a protection against overspeeding. It has been shown that an optimal emergency driving operation is not possible in many cases with the known emergency driving devices.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved emergency driving device for a diesel internal combustion engine.
In contrast to the prior art on which it is based, the emergency driving device, according to the invention, has the advantage that an emergency driving signal, which makes possible a stable speed control of the internal combustion engine, can be produced with relatively simple means. In the case of digital signal processing, it has the further advantage that no additional storage location is required aside from the storage location provided by the microprocessor. The device proves particularly economical because of the saving on additional electronic component parts.
A particular advantage consists in that the emergency driving signal does not depend on the manner in which the actual value of the fuel volume is determined.
Advantages also result from the manner in which the signal for the actual value of the fuel volume is monitored. A speed-dependent monitoring makes it possible to conclude in a very precise manner that there is a defective transmitter. In addition, a reverse polarity of the transmitter can be recognized immediately as a function of the fuel volume transmitter.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows a block wiring diagram of the emergency driving device, which shows the manner in which the emergency driving device operates; and
FIG. 2 shows the principle of the monitoring of the actual value of fuel volume.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The block wiring diagram shown in FIG. 1 concerns a diesel internal combustion engine with electronic control of the fuel supply. A drive pedal position transmitter 13 is connected with the switch 31 via an analog-to-digital converter 14. During interference-free operation the switch 31 connects the drive pedal position transmitter signal with a characteristic diagram 12 via a line 33, at least one speed signal is input in this characteristic diagram 12 as an additional variable. In the most general case, the block 12 is a computing device which, in accordance with the desired driving comfort, determines a desired value of fuel volume from the signal of the drive pedal position transmitter and signals which are dependent upon the operating parameters, such as speed, coolant temperature or battery voltage. The output of the characteristic diagram 12 is connected with an adding point 29 to
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Brauninger Jurgen
Duhlmeyer Wolfgang
Kettenacker Gunter
Schafer Volker
Sieber Albrecht
Miller Carl Stuart
Robert & Bosch GmbH
Striker Michael J.
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