DD154877A3 - DIGITAL VEHICLE - Google Patents

Abstract

The invention relates to automotive instrumentation. The aim of the invention is to reduce the manufacturing costs in terms of component cost and labor costs and to increase the utility value and reliability. The object is to provide a microcomputer-controlled tachograph that records, displays, preprocesses, stores and outputs operating characteristics, operating states and manually inputable data. The essence of the invention is that the microcomputer for determining the operating characteristics increments certain memory locations when pulses generated by the pulse generator interrupt signals that the microcomputer stores the journey in the form of data blocks, consisting of speed value, distance and operating state signals when one of Groessen has changed that the journey over the tachometer display devices can be output, that the microcomputer determines the duration of the operating conditions corresponding signals by incrementing assigned memory locations and that the microcomputer stores the data entered by hand only in the change along with time and Tageskilometerstand. The invention is used in motor vehicles, especially commercial vehicles.

Description

Title of the invention Digital tachograph

Field of application of the invention;

The invention relates to a digital tachograph for motor vehicles, in particular commercial vehicles, for recording and displaying vehicle operating characteristics and for recording and storing vehicle operating characteristics, operating conditions and data that can be entered manually via operating elements.

Cha characteristics of the known technical solu tions

Tachographs are generally known which record the acquired data on diagranium discs and display them via hands and reel counters. Such tachographs contain many mechanical or electromechanical components and assemblies and can only be produced with a high workload. Because of the many mechanical components reliability and service life are smaller than in electronic devices, Another disadvantage is that expensive reading devices with optoelectronic scanning are required to evaluate the data recorded on the graph charts * Diagram discs with damage or scratches can not be evaluated by such automatic reading devices.

There are arrangements for recording vehicle parameters known OS 2611471, which receive both sensor-detected operating parameters and manually entered data in shift registers, i. in electronic caches, enroll. Upon actuation of a data entry button by the driver, the contents of the latches are stored in memory.

device, e.g. Magnetic tape cassette, solid state memory, which can be removed from the entire arrangement to read the data and to enter for further processing in a computer can »can be a disadvantage of these arrangements is that the data are stored only when pressing a data entry button» The data w erden without Compaction and preprocessing stored so that large capacity storage is required. An indication of the detected operating parameters is not provided.

Furthermore, circuit arrangements OS 2617401 realized with highly integrated circuits are known, which measure, display and store signals generated by transducers mounted on the vehicle. A disadvantage of these circuit arrangements is that data which can be input by hand can not be processed and that special integrated circuits which can only be used for this application are required.

There are facilities for registering operating data of a vehicle known AS 2322299, in each of which the last part of the route is stored. As a buffer a shift register is used, in which constantly enter the detected signals from the transmitter. B.eem impact of the vehicle is transmitted by an impact detector, the contents of the shift register in.einen memory. The technical defect of this device is that a storage of the last part of the route is only in accidents that are associated with an impact of the vehicle takes place.

Electronic devices for storing and reading states and / or values OS 2632438 are known which, depending on the route, eg every 10 m, store the speed value and the time elapsed since the previous storage and which comprise a display device. 'via which the stored route can be displayed step by step, backwards. A disadvantage of these devices is that no data compression takes place, therefore, large-capacity memories are required. These are time-of-flight data loggers with data compression

OS 2434135 known that record the speed, the route and special events. The data compression that results in a reduction of the memory space requirement is achieved by recording only when the speed changes, an event occurs or a certain maximum distance has been reached since the last storage. The measurement of the speed and the determination of whether a speed change has occurred takes place in each case after a certain distance traveled by the vehicle. The data is recorded on magnetic tape. A disadvantage of these Fahrzeugdatenaufzeichnungsgeräten is that many electronic assemblies and components are required to implement such devices. Another disadvantage is that the speed measurement takes place in each case after a certain distance, since a measurement at certain time intervals with less effort is feasible. Of great disadvantage is that a magnetic tape is used as a storage medium, su below. Drive mechanical and thus prone to failure means must be used.

A digital tachograph OS 2715527 is known in which the recording of the vehicle operating parameters measured by vehicle sensor devices takes place in solid-state memories and a microprocessor system is used to process the vehicle operating characteristics and to convey them to the solid-state memory and to the digital display devices Microprocessor system, ie a freely programmable microcomputer, allows the realization of a tachograph with a few highly integrated circuits. A disadvantage of this digital tachograph, however, that the manual input of data by the driver is not possible «Another disadvantage is that the stored in the solid state memory D'aten can not be made visible on the display devices of the digital tachograph.

Object of the invention

The object of the invention is to provide a digital tachograph that eliminates the mentioned disadvantages,

reduces the cost of both component and labor costs and reduces the space required. The useful effect of the invention is to be seen in the increase of the use value while reducing the material and labor costs. Des v / eiteren is increased with the present invention, the reliability and the life of the tachograph, thereby Eeparaturkosten and repair times are reduced at the user of the tachograph invention.

With the present invention, the technical effort and the time required to provide the tachograph data is reduced in computer readable form and increases the reliability of the data transmission. The invented tachograph detects and stores additional data needed for fleet organization, but the known tachographs do not register.

Represents 1 eg of ung We sens _i of Erf indung;

The invention has for its object to provide by using a microcomputer, a digital tachograph, the operating characteristics, operating state and manually entered data recorded, displays, preprocessed and compressed, stores the preprocessed and compressed data and outputs on request.

According to the invention, the object is achieved in that the transducers are pulse generators whose frequency is proportional to the magnitude of the operating characteristic values, that the signal transmitters and the operating elements are e.g. two static signals for the manual input of binary signals, that the output of each transmitter is connected to an interrupt input of the microcomputer, that the microcomputer increments each receiving a pulse counter for transmitter pulses storage space in Festkörperpeieher receiving a pulse at one of the interrupt inputs in that a time pulse-emitting output of an electronic digital clock is connected to a further interrupt input of the microcomputer and in that the microcomputer stores the contents of each pulse counter in the solid state memory after each time pulse at the interrupt input.

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stores the personal memory and sets the pulse counter to zero. According to the invention, the microcomputer writes after each time pulse in a reserved area of Pestorgepeichers on successive memory locations one data block, consisting of the operating characteristic vehicle speed, from the distance covered since the date of the previous storage of a data block and generated by signal generators and the microcomputer via Input ports detected brake and turn indicator operating status signals when the speed value has changed from the speed value at the time the data block was previously stored by at least a predetermined amount, or when the distance traveled has exceeded or exceeded a certain amount since the time the data block was previously stored or if the operating condition signals for brake and direction indicator have been from the time of previous memory changed a data block. For outputting the stored last cable of the route, the microcomputer queries the operating state of a switch arranged on the digital tachograph, asks the switch is closed, the operating state of an arranged on the digital tachograph button, reads the last stored data block from the reserved area when the button is pressed of the solid state memory, displays the speed value of the data block on the digital tachometer speedometer, the mileage indicator low-range digits, and the brake and turn signal operating status signals on the mileage indicator digits. When the button is pressed again, the microcomputer reads out the next data block from the solid-state memory device and displays it in the aforementioned manner. According to the invention, when the vehicle is stationary, the microcomputer queries a specific pole of a multi-pole connector arranged on the tachograph. and transmits the contents of the solid-state memory via the multi-pin connector and the cable in the data collection device in case of concern issued by a data collection device and transmitted via a cable signal the contents of the solid state memory.

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According to the invention, the microcomputer asks at certain intervals from the signal generator and incremented in the presence of logic 1 signal at the outputs of the signal generator specific to the signalers and thus the operating states associated memory locations in Festkörperspeieher. According to the invention, the microcomputer also queries the input manually with the control elements via input ports and stores them together with the voltage applied to an output of the digital clock in the form of electrical, binary signals time and the distance traveled at that time route as a data block in a reserved area of the solid-state memory when the microcomputer, when interrogating the data entered by hand, detects a change in that data from that at the time of the previous poll. "

In one possible specific embodiment of the invention, the transducers are optoelectronic transducers. The operating characteristics are vehicle speed, engine speed and fuel consumption. The operating conditions detected by the transducers in a particular embodiment of the invention are the operating state of the direction indicator, brake, brake pressure switch and Horn, also the operating condition of the engine, the operating state of vehicle-mounted auxiliary units and the trailer operation of the vehicle.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings, Fig. 1 shows the block diagram of a digital tachograph s according to the invention _;

To control the tachograph is' a freely programmable microcomputer 19, preferably a 1-chip computer. The instructions stored in the program memory 61 of the microcomputer 19 in the form of binary, electrical signals determine which operations the microcomputer 19 carries out. The entirety of the stored commands, the operating program, thus determines the operation of the digital tachograph. In the execution of the operating program, those at the input ports 56,

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57j 58 of the microcomputer 19 read in, decoded, processed and compressed and in the output ports 5> 5 »60 for controlling the speed indicator 34, the electronic display devices 51» 52 and the odometer display 54 inscribed · Furthermore, the data in the output port 62 to Storage is stored in the Pestkörpers memory 23 and in the output gate 59 for Ausgab.der stored data on the multi-pin connector 37 »38 and the cable 39 inscribed. The solid-state memory 23 is a non-volatile random access memory or a buffered CMOS read-write memory.

As a transmitter 1, 2, 3 optoelectronic pulse generator are used, the frequency of which is proportional to the amount of the associated operating characteristic. The outputs I3 »14, 15 of the transducers 1, 2, 3 are each connected to an interrupt input 16, 17, 18 of the microcomputer.

The signal generator 4, 5 »6, 7> 8, 9 and the controls 10, 11 for manual input of data generate static, binary signals that are fed to the input ports 56, ^ 7 of the microcomputer 19»

The digital clock 12 has an output 24 which outputs timing pulses and is connected to a further interrupt input 25 of the microcomputer. At the output 50 of the digital clock 12, the time is in the form of electrical, binary signals. The output 50 of the digital clock 12 is. connected to the input port 58 of the microcomputer 19. The switch 32 and the button 33 "via which the stepwise output of the last part of the route is requested are likewise connected to the input gate 58.

Upon receipt of a pulse at one of the interrupt inputs 16, 17 »18, the microcomputer 19 increments each one serving as a pulse counter for the Meßwertgeberimpulse memory 20, 21, 22 in the solid state memory 23. Upon receipt of a timing pulse at the interrupt input 25 of the microcomputer 19 writes the contents of each pulse counter on each an operating characteristic memory 26, 27, 28 and the pulse counter 20, 21, 22 to zero. After completion of these operations, the microcomputer 19 performs a plurality of comparison operations described in more detail below

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with positive result of the comparison operations stores a data block consisting of the operating characteristic vehicle speed, from the distance traveled since the time of the previous storage of a data block and from the signal generators 4, 5 generated and via the inputs 30, y \ of Eingäbetores \ 56 of the microcomputer 19 detected operating state signals for brake and direction indicator, in a reserved area 29 of the solid state memory 23 on successive memory locations. The distance traveled is determined by the microcomputer 19 summing up the speed values' which it has written into the operating memory value memory location 26 at each time pulse at the interrupt input 25. The microcomputer 19 stores a data block only when the speed value has changed from the speed value at the time of the previous storage of a data block by at least a predetermined amount, or when the distance traveled since the time of the previous storage of a data block reaches a certain amount or has exceeded or if the operating state signals for brake and direction indicators have changed since the date of the previous storage of a data block. The data blocks are stored in the reserved area 29 of the solid-state memory in such a way that the current data block to be stored overwrites the respectively oldest data block. Thus, the last part of the route is recorded. To output the last part of the route in case of accidents or .Verkehrskontrollen asks the microcomputer 19 after each time pulse at the interrupt input 25 and after execution of the operations described above, the operating state of the switch 32, asks the switch state, the operating state of the button 33, reads when the button is pressed the last stored data block from the reserved area 29 of the solid state memory 23 and brings the Geschvaltungswert on the speed indicator 34, the distance to the low points 35 of the odometer display 54 and the operating condition signals for brake and direction indicator on the high-order points 36 of the odometer 54th

see full ad. When the button 33 is pressed again, the microcomputer 19 reads out the next data block from the plague memory 23 and displays it in the aforementioned manner. The output of the last part of the route is only possible if the vehicle speed is equal to zero. This is achieved by having the microcomputer 19 interrogate, between the individual operations which are carried out successively in the output, the pulse counter 20 in which the pulses of the speed sensor 1 are counted. With a count greater than zero, the output of the last part of the route is not started or interrupted, and the microcomputer 19 carries out the next operations.

The output of the data stored in the solid state memory 23 via the output port 59, the multi-pin connector 37 »38 and the cable 39 is also possible only when the vehicle is stationary. The microcomputer I9 queries a particular pole of the multi-pin connector 37} 38 and transmits the contents of the solid state reader 23 via the cable 39 i & the data collection device connected to the cable, if at the interrogated pole of the connector 37 »38 a particular one of the data collection device emitted signal is present. The transfer of data from the tachograph to the data collection device takes place in the acknowledgment mode, for which purpose the cable 39 has corresponding control lines. The microcomputer I9 queries via the input port 56, the signal generator 6,7, 8, 9 and incremented in the presence of logic 1 signal at the outputs 40, 41, 42, 43 certain memory locations 44, 45, 46, 47 in the solid state memory 23, which are assigned to the individual signal generators 6, 7, 8, 9 and thus to the operating states. The operating states detected by the signal generators 6, 7, 8, 9 are in the exemplary embodiment the operating state of the engine, the operating state of vehicle-mounted auxiliary units and the trailer operation of the vehicle. By incrementing the memory locations 44, 45, 46, 47 at certain time intervals in the presence of a logical 1 signal at the corresponding pulse generator, the engine running time, the operating time of the additional units and the duration of trailer operation are determined.

After interrogation of the signal generator 6, 7, 8, 9 and the execution of the operations described above, the microcomputer 19 via the inputs 48, 49 of the input port 57 queries the data set by hand with the controls 10,11 and stores them as a data block together with the time applied to the output 50 of the digital clock 12 in the form of electrical, binary signals and the distance traveled at this time in a reserved area 53 <3.es Festkörperspeicliers 23 when the microcomputer 19 in the query of manually set data a change to those who were present at the time of the previous query. After processing the above-described operations performed as a result of the interrupt signals at the inputs 16, 17, 18, -25, the microcomputer 19 realizes the display of the operating characteristics until it again receives an interrupt signal. In order to realize the display, the microcomputer 19 reads out the current operating characteristic values from the memory locations 26, 27, 28 and the odometer reading contained in the memory area 63, decodes these data and writes them in the output ports 55, 60. In the exemplary embodiment, the operating characteristics are the vehicle speed, the engine speed and the fuel consumption.

Claims (4)

Claim 1. A digital tachograph for motor vehicles with sensors arranged on the vehicle for detecting operating characteristics, "with signal generators for detecting operating conditions, with controls for manual input of data, with a solid state memory, in particular a nonvolatile semiconductor memory or a buffered CMOS-Speieher, with electronic display devices for Display of operating characteristics, with a digital clock and a microcomputer for the preparation and decoding of the operating characteristic signals and control of the electronic displays, processing and compression of the data collected by the transducers and the signal transmitters and entered manually, for transporting the detected, processed and compressed Data in the solid-state memory and for reading the stored data via a cable and a multi-pin connector into a Da te ns amine 1 device for the purpose of transfer to a central computer, characterized that the transducers, e.g. three, (1, 2, 3) pulse generators whose frequency is proportional to the magnitude of the operating characteristics, that the signalers, e.g. six, (4,5,6,7, B, 9) and the controls, e.g. two, (10,11) generate static, binary signals for manual input of data, the output (13, 14, 15) of each transmitter (1, 2, 3) is connected to ♦ -an interrupt input (16, 17, 18) of the microcomputer (19), in that the microcomputer (19), upon receipt of a pulse at one of the interrupt inputs (16, 17, 18), respectively increments a memory location (20, 21, 22) in the solid-state memory (23) which serves as pulse counter for transmitter pulses, in that a timer-emitting output (24) of the electronic digital clock (12) is connected to a further interrupt input (25) of the microcomputer (19), that the microcomputer (19) after each time pulse at the interrupt Input (25) stores the contents of each pulse counter (20,21,22) on each an operating characteristic memory location (26,27,28) in the solid state memory <23), and sets the pulse counter (20,21,22) to zero, that the microcomputer (19) after each time pulse in a reserved area (29) of the solid-state memory (23) writes successive memory locations each a data block consisting of the operating characteristic vehicle speed, from the distance traveled since the date of the previous storage of a data block and from the signal generators (4,5,) and detected via inputs of the input of the microcomputer (30,3Ό detected operating state signals for brake and direction indicator when the speed value has changed from the speed value at the time of the previous storage of a data block by at least a predetermined amount, or if the distance traveled has reached or exceeded a certain amount since the date of the previous storage of a data block, or if the operating state signals for the brake and direction indicator have been from the time de changed the previous storage of a data block, in that the microcomputer (19) interrogates the operating state of a peeler (32) arranged on the digital tachograph when the vehicle is stationary to interrogate the operating state of a pushbutton (33) arranged on the digital tachograph when the switch (32) is closed from the reserved area (29) of the solid-state memory (23), the speed value of the data block on the speed indicator (34) of the digital tachograph, the distance to the low-order locations (35) of the odometer display (5 ^ 0 and the operating state signals for brake and direction indicator on the higher digits (36) of the odometer display (5 ^Z O brings to display and on re-pressing the button (33) the next data block from the Festkörperpeichef (23) and reads out in the aforementioned manner 'displays, in that the microcomputer (19) "interrogates a specific pole of the multi-pole connector (37, 38) when the vehicle is stationary, and if the signal emitted by the data relay device is transmitted via the cable (39), the content of the solid-state memory (23) is transmitted via the cable (39 ) and outputs the multi-pin connector (37, 38) into the data collection device connected to the cable (39), in that the microcomputer (19) interrogates the signal transmitters (6, 7, 8, 9) at specific time intervals, and in the presence of a logical 1 signal at their outputs (40, 41, 42, 43), the individual signal generators (6, 7, 8.9) and operating states associated memory locations (44,45,46,47) in the solid state memory (23) is incremented, and that the microcomputer (19) interrogates the data set manually with the operating elements (10, 11) via the inputs (48, 49) and as a data block together with that at the output (50) of the digital clock (12) in the form of electrical, binary Signals adjacent time and the distance traveled at this time in a reserved area (53) of the solid-state memory (23) stores when the microcomputer (19) when querying the data entered by hand, a change of these data compared to those at the time of previous query. 2. Digital tachograph according to item 1, characterized that the transducers (1,2,3) are optoelectronic pulse generator. 3 · Digital tachograph according to item 1, characterized that the operating characteristics are the vehicle speed, the engine speed and the fuel consumption, 4. Digital tachograph according to item 1, characterized the operating state © is the operating state of the direction indicator, brake, brake pressure switch and horn, as well as the operating state of the engine, the operating state of vehicle-mounted auxiliary units and the trailer operation of the vehicle. For this 1 page drawing