CA1103632A - Multipurpose vehicle condition recorder - Google Patents
Multipurpose vehicle condition recorderInfo
- Publication number
- CA1103632A CA1103632A CA287,369A CA287369A CA1103632A CA 1103632 A CA1103632 A CA 1103632A CA 287369 A CA287369 A CA 287369A CA 1103632 A CA1103632 A CA 1103632A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- recording
- recording system
- scanning
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
- G01D1/14—Measuring arrangements giving results other than momentary value of variable, of general application giving a distribution function of a value, i.e. number of times the value comes within specified ranges of amplitude
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D9/00—Recording measured values
- G01D9/28—Producing one or more recordings, each recording being of the values of two or more different variables
- G01D9/32—Producing one or more recordings, each recording being of the values of two or more different variables there being a common recording element for two or more variables
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Time Recorders, Dirve Recorders, Access Control (AREA)
- Recording Measured Values (AREA)
Abstract
ABSTRACT OF THE INVENTION
The present invention relates to a vehicle recording system for recording a multiplicity of operating conditions in a chart. The system includes a recorder, which is adapted to permit continuous inscribing while moving across the chart at essentially right angles to its direction of move-ment, a positioning mechanism for moving the inscriber to recording positions in response to a single control signal and a control signal selector to selectively direct different control signals for the multiplicity of operating conditions to the servocontrol mechanism. The control signals themselves are the result of two separate input signals which are com-bined. One of these input signals identifies a partic ular operating condition and the other of the input signals identifies the value of that particular operating condition for simultaneous appropriate recording of the identification and value of a particular operating condition on the chart.
The present invention relates to a vehicle recording system for recording a multiplicity of operating conditions in a chart. The system includes a recorder, which is adapted to permit continuous inscribing while moving across the chart at essentially right angles to its direction of move-ment, a positioning mechanism for moving the inscriber to recording positions in response to a single control signal and a control signal selector to selectively direct different control signals for the multiplicity of operating conditions to the servocontrol mechanism. The control signals themselves are the result of two separate input signals which are com-bined. One of these input signals identifies a partic ular operating condition and the other of the input signals identifies the value of that particular operating condition for simultaneous appropriate recording of the identification and value of a particular operating condition on the chart.
Description
~`ield of the Invention This invention relates to an instrument which records a multiplicity of vehicle operating conditions. Such instruments are generally known as tachographs.
Background of the Invention Motor driven vehicles such as trucks, boats and the like, are driver operated away from supervision. Such vehicles are large energy users making them very costly to operate.
Control is required to assure safe as well as energy and maintenance saving operation. Increasing complexity requires that more and more functions be controlled. It is desirable to continuously analogue record certain of the more critical conditions. Others may be recorded in an on/off manner to observe whether or not undesirable conditions exist.
Presently available recording instruments use a plurality of styli for the recording of more than one variable.
However, because such instruments mounted in the vehicles must be small, there is an obvious constraint of space and the recording area on the charts is quite limited. This in turn, limits the number of styli which can be used to record different functions on the chart.
Another method used to increase the recording space on a chart, is to record from both sides of the paper disc forming the chart by means of opposed styli. Although this arrangement overcomes the problem to a certain extent, it still does not maximize the recording area available on the chart.
Present recording systems assign a stylus for each parameter or operating condition to be recorded. Therefore the number of variables which can be recorded is restricted due to the very limited number of positions assignable to each stylus.
Background of the Invention Motor driven vehicles such as trucks, boats and the like, are driver operated away from supervision. Such vehicles are large energy users making them very costly to operate.
Control is required to assure safe as well as energy and maintenance saving operation. Increasing complexity requires that more and more functions be controlled. It is desirable to continuously analogue record certain of the more critical conditions. Others may be recorded in an on/off manner to observe whether or not undesirable conditions exist.
Presently available recording instruments use a plurality of styli for the recording of more than one variable.
However, because such instruments mounted in the vehicles must be small, there is an obvious constraint of space and the recording area on the charts is quite limited. This in turn, limits the number of styli which can be used to record different functions on the chart.
Another method used to increase the recording space on a chart, is to record from both sides of the paper disc forming the chart by means of opposed styli. Although this arrangement overcomes the problem to a certain extent, it still does not maximize the recording area available on the chart.
Present recording systems assign a stylus for each parameter or operating condition to be recorded. Therefore the number of variables which can be recorded is restricted due to the very limited number of positions assignable to each stylus.
- 2 - ~
most present systems have a capacity of three styli on each side of the paper disc.
The present invention maximizes the useable recordinq area on a chart. It is based on controlling the stvlus such than an individual stylus can record a multiplicitv of operating conditions. The system preferably incorporates a single stylus which is electronically controlled. It could however be mechani-cally controlled and include more than one stylus.
The recording system o~ this invention therefore, is for use in vehicles and records a multiplicity of operatinq con-ditions on a chart. The system includes: the combination of recording means which inscribes on the chart at essentially right angles to the chart's direction of movement; servocontrolled positioning means for positioning and moving the recording means to a recording position in response to a control signal; and control means to selectively direct different control signals for the multiplicity of operating conditions to the servocontrolled positioning means.
Brief Description of the Drawinqs The above, as well as other advantages and features of the present invention will become apparent in the followinq detailed description of the preferred embodiments according to this invention, wherein:
Figure l is a schematic view of the system showing a plurality of alternative control means;
Figure 2 is a schematic of a control means used for the automatic recording of vehicle oPerating conditions;
Figure 3 is a schematic of a recording system used for the recording of independent simultaneously occurrinq vehicle i~ operating conditions;
1 Figures 4 through 9 are representative of charts onto which various operating conditions have been recorded.
Detailed Description of the Preferred Embodiments The following description relates to control signals having different voltage levels in which ~ach voltage level corresponds to a different operating condition. It is to be understood that control signals or predetermined different frequencies relating to the various operating conditions can ~lso be used to carry out the invention.
Figure 1 shows a recording system provided with stylus guide 1 having a rack engaged-by gear 2, the position of which is determined by motor 3. Motor 3, as shown in Figure 3, carries a feedback mechanism providing a voltage output to line 4, which is proportionate to the position of stylus guide 1. The internal control of the motor automatically responds to a voltage input through line 5, in such a manner that the feedback voltage along line 4 is adjusted to the level of the input voltage. Therefore, by applying appropriate voltages through line 5, one can select the desired position of stylus guide 1. The stylus guide carries stylus 6, which inscribes on chart 7. Chart 7 is held and rotated by a conventional clock mechanism. (Not Shown) The stylus and the guide carrying the stylus move at essentially right angles to the direction of rotation of rotating chart 7. The stylus provides the recording means, while the motor with gear and stylus guide constitute the servocontrolled positioning means. Through the use of control signals, the recording means are controlled to assume a position corresponding to the signal valve.
By suitable alternate selection from two or more input signals, the recorder can now be made to record a variety 1~'3;~2 of functions.
The analogue values of different parameters or operating conditions can be consequtively scanned and recorded in a predetermined pattern or in an irregular sequence as may be required. As shown in Figure 6, the stylus records these para-meters as lines or bands of different thicknesses with the upper edge of the line or band representing the analogue value and the width of the line or band indicating which parameter is recorded.
Two parameters may be recorded starting from different base lines as shown in Figure 8. On the other hand, one can use a common base line by suppressing value ran~es normally not occuring or not being of interest and record one condition in the upper portion of the available total stylus travel and another in the lower portion. By switching in short time intervals the signal voltages for the servocontrolled driving means of the stylus between those of the parameters the stylus moves in short sequence between the points indicative for their value on the chart.' As shown in Figure 9, this creates a solid band of varying width. The upper borderline of the band showing the values of one and the lower borderline the value of the other parameter as an essentially continuous graph line.
The most simple type of multiple recording consists in using an input system gererally indicated at A as shown in Figure l. It consists of a control means comprising hand switch 8 with which line 9 can he connected alternatively to different voltage levels available from a voltage divider 10 which is one - form of a control signal generating means J By assigning for instance different work situations of a vehicle driver like waiting, loading and unloading to the different voltage levels, 11~36;~2 ;he occurrence of such work situations can be recorded on chart 7 by putting the hand switch in the corresponding position and by moving switch 11 to a position where it connects line 5 with line 9. Motor 3 will then move stylus 6 to positions corresponding to the voltage level selected by hand switch 8.
An automatic recording of vehicle operating conditions like engine operating parameters or conditions of auxillary equipment on a vehicle can be made by using the input system B
shown in Figure 1. Engine operating systems are in many instances presently equipped with pre-set limit switches which provide a warning signal, i.e., a warning light or a buzzer, if crucial parameters such as the coolant level, oil temperature, air pressure etc., which are automatically sensed are in a critical condition.
In input system B these warning signals would be individually connected to the control means comprising relays 12, 13, 14, etc.
These relays connect lines 15, 16, 17, etc. which take signals of different voltage levels from the control signal generating device 18 to a scanner 19. Scanner 19 continuously scans lines 15, 16, 17.
If for instance the coolant level drops below the warning point the warning signal will activate relay 12 and will therefore bring the voltage of line 15 into the scanner.
When the scanner finds this voltage it will stop for a pre-determined period and transmit via the output line 20 the cor-responding voltage to the motor 3 through switch 13 which has been set to select the mode of control supplied by input system B~ Oscillator 21 is provided in line 20. rrhis oscillator acts as a control signal pattern generating means and superimposes on the constant voltage supplied through line 15 ~rom the signal ~0 generating device 18 an oscillating voltage between zero and 6~2 one Volt. Therefore, the recordin~ stylus 6 does not remain in a steady position. It moves according to the voltage oscillation and inscribes a narrow solid band on the chart as shown in the left portion of Figure 4.
Another application of the invention is realized by using the input system C shown in Figure 1. A variety of analoque input signals as for instance rpm exhaust temperature, water temperature, oil pressure are connected to signal conditioners 22 if the direct input signals are not compatible with the required voltages on line 5. Each signal then passes through a control signal pattern generating device such as oscillators Vl, V2, V3 and V4 respectively. These control siqnal pattern qeneratinq devices superimpose an oscillating voltage which is different for each channel. Whenever one of the analogue channels is connected by switching or control means 23 to line 24 and line 24 is connected by selector switch 11 to line 5, then the corresponding analogue signal with a superimposed identifying oscillating voltaqe is recorded by stylus 6 on the chart. The chart recordings will easily allow identification of the recorded signal by the width of the inscribed band determined by the respective control signal pattern generating device.
Figure 6 shows for instance three different parameters.
RPM of the engine are recorded as thin lines. The temperature is recorded with a narrow band and the pressure is recorded by a wide band.
Recordings obtainéd without the siqnal generating device are shown in Figure 5. As can be seen, these different parameters are only recognizable when they appear ort distinct and separate locations on the chart. If these recordinq lines ~ot^
different parameters appear in the sa.~e portion of the charJ, i3~
~here is an obvious interpretation problem. This is avoided through the use of the control siqnal pattern generating device.
The applications described so far deal with situa-tions in which the parameter to be recorded is selected by hand or in which the conditions to be recorded are such that only one of them can exist at anyone time. Should, however, conditions occur simultaneously or in very short sequence of each other, a special scanning system as shown in Figure 2 presents a refinement of the invention. This scanning system can take the place of scanner 19 in the case of parameters which may occur simultaneously.
The warning limit input channels Ia and Iu, which carry signals from automatic limit switches, activate individual latches in a latching device 25. A scanning device 26 scans these latches continuously over scanning line 27 in a given sequence and connects the warning signal of the channel concerned with the output line 28 of the latch. Simultaneously, the scanning device 26 connects in the same scanning sequence, an individual pattern created by the control signal pattern generating device 29 with output iine 28 and output line 30. The scanning device controls therefore, the warning input channel which is latched. The latch signal is for a predetermined time transmitted through line 28 into the control signal pattern generating device where an identifying signal pattern is superimposed on the signal. This so modified and identified signal is sent through line 30 into the servocontrolled positioning means which moves the record-ing stvlus to a recording position.
When the control signal pattern generating device 29 receives an input through line 28, a timing device 31 is acti-vated for a predetermined timing period. During this timing ~9 period, the timing device sends a signal along line 32 t:o the 114336;~2 scanning device, thereby stopping the scanninq device and maintaining a connection between the latch and the control signal pattern generating device through line 28. The timinq device can be set to different time periods. These time periods are selected such that the event which is recorded is clearly recognizable on the chart. Therefore, to a certain extent, the timing period is dependent upon the speed at which the chart travels. At the end of the pre-set time period, the timing device sends a release signal along line 33 to the latching device thereby cutting off the signal along line 28 and a re-start signal alon~ line 32 to the scanning device, which continues its scanning until it again finds a latch in a latched condition. The cycle then reoccurs.
After having scanned all the latches in the latchinq device, the scanning device repeats its cycle of scanning. If during the next cycle one of the channels is still in the warninq mode, the warning signal reactivates the corresponding latch and this warning signal is again recorded on the chart for a pre-determined time period. If between scans the warning signal has disappeared, then there is no repeat recording o the condition.
According to a preferred embodiment of this invention, control signal pattern generating device 29 is eliminated and each of the warnin~ limit switch event channels Ia and Iu is provided with its own individual control signal pattern generating devices such as those shown in in-put system C of Figure l, marked Vl through V4.
Furthermore, the latching device can be set up such that it will only react to a signal of a certain level o a certain duration and signals below that level or duration are ~9 not latched in the latching device~ The latching device may be _ g _ L replaced by other signal storage means or memories for the storin~
of the various signals relating to the warning conditions.
Fi~ure 4 shows a warning pattern as recorded by the above-described system. The chart includes different radial fields in which the warnin~ si~nals are recorded as a band. The signal pattern carrying device may be designed to drop the voltage to zero along line 30 when no warnin~ condition exists. Figure 4 shows this arrangement in which the stylus advances from zero to radial field g for the recording of a condition. After record-ing for the period of time set by the timing device, thestylus first returns to zero and then moves to radial field i :
for the recording of a second warning condition. Again the stylus returns to zero and thereafter records in radial field 1. These recordings appear in the central portion of Figure 4.
The warning conditions recorded in radial fields ~, i, and e are not serious enough to require an immediate shut-down of the vehicle. These warning signals are therefore trans-mitted along lines Ia to the latching device.
Should the conditions become dangerous to the extent that an immediate shut-down is required and a second warninq signal from the same warning switch or a signal from a warning switch at a different signal level, is sent to the latchinq device along channels Iu, which carry information relatin~ to shut-down conditions.
The control signal pattern generating device 29 may identify the shut-down conditions in the same identifyinq radial fields a-i of Figure 4. However they are identified in a different manner. As is shown in the central portion of Fi~ure 4, the recording stylus has returned to the zero line at the centre of the chart only for the first three events. The foul^th 1~3~6~2 recorded warnill~ event, the secQ~ld one recorded in field g shows the recording stylus moving to the outer edae of the chart for all following warning recordings which relate to shut-down conditions. Therefore, the three additional events shown in fields i, g and e occurred as shut-down conditions in which case the initial warning condition had deteriorated to a shut-down condition. This recordin~ pattern can be effected by selecting a signal pattern for shut down conditions in which the stylus will receive a full voltage at the beginning and the end of each recordin~ period determined by the timing device 31.
In another application of the invention it is possible to record two parameters in an analoque fashion. Two different possibilities of recording are shown in Figure 7 and Figure 8.
These recordings are obtained by adapting switchin~
means 23 such that it automatically switches line 24 in a pre-set time pattern between the various input channels. In this case the signal conditioners 22 function in the following manner. In order to obtain the recording pattern as shown in Figure 7 in which a common base line 50 is used the signal conditioner for the rpm channel provides a volta~e to line 24 which brings the stylus into the zero position. ~7ith increases of the rpm the voltage increases and reaches a maximum at a location above the base line. Therefore, whenever line 24 is connected to V4 generating a control signal pattern relating to rpm, the stylus assumes the position between base line 50 and locations above the base line which correspond to the rpm of the motor.
In order to operate from the common base line the signal conditioners for both rpm and exhaust temperature provide identical voltages when both conditions are at zero. ~s the input signals are transmitted to the servocontrolled positioning means the stylus moves above and below the common base 'ine depending upon which condition is being recorded. If both conditions remain at zero the stylus will record along the zero line.
Figure 8 shows a modified recording pattern for recording rpm which is recorded in the upper radial fields with base line 52 and temperature which is recorded in the lower radial fields having a base line 54. As can be seen the low rpm ranqes are suppressed so that recordings start only with 1000 rpm. Temperatures under 900 are also suppressed. Further-more, temperature as well as rpm scales are arranged such that both are rising from the inside to the outside of the chart.
The voltages for engine rpm are processed such that anything up to 1000 rpm provides a constant voltage. Increases in rpm above 1000 rpm increase the signal voltages such that recordings above base line 52 are obtained on the chart.
Correspondingly the exhaust temperature voltages are processed such that no voltage is supplied to motor 3 when the temperature is below 900 degrees. However, between 900 and 1600 degrees a corresponding voltage increase will make the stylus record between the base line 54 and base line 52. This recording system allows therefore a convenient relatively larqe scale simultaneous recording of two vehicle parameters.
In addition to the recording of varying conditions, the control of vehicle conditions requires the recording of cumulative figures or the counting of events and units. This is done conventionally by recording a saw toothed pattern. The recording stylus in such a pattern is made to move between fixed top and ~ottom positions. The mechanical or electrical ~ 6~2 1 movin~ means are desiqned in such a fashion that for eac}l unit to be eounted the stylus is made to move from the bottom upwards by a certain small inerement. The number of increments or steps required to move the stylus from the bottom position to the top position is usually made equal to the number of steps required to brin~ the stylus from the top position back to the bottom position. In tachoqraph charts it is, for instance, common to make the stylus travel from the bottom to the top and the top to the bottom eclual to a distance of 5 miles travelled. If the number of units to be counted remains constant per unit of time, the resultin~ recording looks like a saw-tooth pattern. Whenever time passes without adding any additional units the up and down lines become horizontal lines if recorded on a tape or seetions of a cirele if reeorded on eircular charts.
A modified applieation of this invention eonsists in eontrollincJ the stylus in a eorrespondin~ way by electrical means to reeord or count quantities. Aqain this system can be applied in a more advaneed fashion to not only eount one but two different kind of units with one stylus. An example of such 2~ reeordings is shown in.Fi~ure 9 .
The radial fields above base line 56 constitute the recordin~ area for siqnals relating to a first quantity, i.e., packin~ cycles of a garbage collection truck. The radial fields between base lines 56 and 58 constitute the recordin~ area for information relatincJ to a second quantity, i.e., the number of ~allons of fuel consumed by the ~ehie].e.
To record the number of units of 2 different quantities it is necessary that a pulse sendinc3 unit is provided for each of the quantities to be controlled. The number o~ packaqinq cycles can, for instance, be controlled by a limit switch actuated 1 duLing each cycle of the mechanical packer, so that for each cycle one pulse is available. The number of gallons consumed by the engine can be metered by a fuel meter equipped with a pulse sending unit sending pulses for every one tenth of a gallon.
Such fuel meters are commonly used and available.
The ori~inal pulses of these sending units are then modified by a pulse shaping unit, so that the resultinq pulses are of constant amplitude and duration. These pulses are then accumulated in a ramp providing an output voltage which increases in equal increments with each pulse. After reaching a maximum voltage corresponding to the number of pulses which results in the upward travel of the stylus, the function of the ramp is reversed and the output voltage is reduced Per pulse by the same increment or drops in one step to the minimum voltaqe.
Therefore, the ramp converts the continuous pulses in a cor-responding risin~ and falling output volta~e. These risinq and fallin~ output voltages of each channel are then alternatively and in a short period cycle connected to the input line 5 for motor 3. This automatic cyclinq between the two voltaqes results in the recording pattern as shown in Figure 9 . This system also allows the mixing of recording patterns as shown in Figures 4 throu~h 9 by one instrument on the same chart. It would, for instance, be easy to have the entire recordinq pattern as shown in Figures 8 and 9, recorded in the upper radial fields and have fuel consumption recorded in the lower radial fields.
Another possible application would be to record the number of passengers in a bus at any ~iven moment in the upper part of the chart and to continuously record the number of passen-gers entering the bus in the lower part of the chart. The bottom fields would then be a quantity recordinq line while the 6~`2 1 top fields would represent the condition figure for any given moment.
In certain cases it may be an advantaae to record a multitude of events and even simultaneously occuring events at essentially the moment that they occur. Figure 3 shows a system adapted to carry out this type of recordinq. The functions of stylus guide 1, gear 2, motor 3, line 5 and feedback line 4 and chart 7 are identical to those described with respect to Figure 1. However, this system contains a modification of stylus 6 which enables the stylus to be lifted throuqh solenoid 34 from the chart surface. Solenoid 34 is controlled by relay 35 which is normally closed and lifts the stylus from the chart, so that no recordings occur. In broad terms solenoid 34 and relay 35 function as deactivating means for the recording stylus.
~ arning limit switches (not shown) provide inputs along lines 60 through 64 to individual voltage range controlled relays 36 through 40. The voltage range controlled relays contain internal controls causing them to close only within the determined voltage limits. These predetermined voltage limits are selected to correspond to the stylus position feedback voltage supplied throush line 4 such that the oil pressure relay 40 closes when the stylus is in the recordi~g range for oil pressure, that the oil level relay 39 closes when the stylus is in the recording range for oil level, etc. The result of this calibration is that during the travel of the recording stylus from its inward position to its outer position the relays close whenever the stylus is within that respective recording range. The stylus 6 is made to perform an automatic regular travel from the top position to ) the bottom position by the stylus position control voltaqe genera-1 tor 41. The speed with which this control voltage generator supplies from zero to the maximum voltage determines the speed with which the stylus 6 travels in and out with respect to the chart.
If, for instance, an oil level warning signal should be present then this signal will be transmitted through the oil level relay when stylus 6 is in the oil level range of recordinq.
Relay 35 is then activated through line 42 to open the normally closed relay. Whenever relay 35 opens the stylus is pressed against the chart by a built-in spring. ~en the stylus leaves the oil level recording range the feedback voltage through line 4 either drops below or exceeds the voltage range, openinq the oil level relay. This closes relay 35 so that the stylus is retracted to a non-recording position.
This invention which is based on the use of a signal stylus for recording a plurality of operating conditions offers the following advantages.
1. It permits a large number of on/off operating conditions ie. twenty to thirty depending on the width of the radial fields to be recorded in an easily identified manner on instruments of conventional size.
2. Existing instrument designs can be modified and used to obtain this versatile multicondition recording pattern.
most present systems have a capacity of three styli on each side of the paper disc.
The present invention maximizes the useable recordinq area on a chart. It is based on controlling the stvlus such than an individual stylus can record a multiplicitv of operating conditions. The system preferably incorporates a single stylus which is electronically controlled. It could however be mechani-cally controlled and include more than one stylus.
The recording system o~ this invention therefore, is for use in vehicles and records a multiplicity of operatinq con-ditions on a chart. The system includes: the combination of recording means which inscribes on the chart at essentially right angles to the chart's direction of movement; servocontrolled positioning means for positioning and moving the recording means to a recording position in response to a control signal; and control means to selectively direct different control signals for the multiplicity of operating conditions to the servocontrolled positioning means.
Brief Description of the Drawinqs The above, as well as other advantages and features of the present invention will become apparent in the followinq detailed description of the preferred embodiments according to this invention, wherein:
Figure l is a schematic view of the system showing a plurality of alternative control means;
Figure 2 is a schematic of a control means used for the automatic recording of vehicle oPerating conditions;
Figure 3 is a schematic of a recording system used for the recording of independent simultaneously occurrinq vehicle i~ operating conditions;
1 Figures 4 through 9 are representative of charts onto which various operating conditions have been recorded.
Detailed Description of the Preferred Embodiments The following description relates to control signals having different voltage levels in which ~ach voltage level corresponds to a different operating condition. It is to be understood that control signals or predetermined different frequencies relating to the various operating conditions can ~lso be used to carry out the invention.
Figure 1 shows a recording system provided with stylus guide 1 having a rack engaged-by gear 2, the position of which is determined by motor 3. Motor 3, as shown in Figure 3, carries a feedback mechanism providing a voltage output to line 4, which is proportionate to the position of stylus guide 1. The internal control of the motor automatically responds to a voltage input through line 5, in such a manner that the feedback voltage along line 4 is adjusted to the level of the input voltage. Therefore, by applying appropriate voltages through line 5, one can select the desired position of stylus guide 1. The stylus guide carries stylus 6, which inscribes on chart 7. Chart 7 is held and rotated by a conventional clock mechanism. (Not Shown) The stylus and the guide carrying the stylus move at essentially right angles to the direction of rotation of rotating chart 7. The stylus provides the recording means, while the motor with gear and stylus guide constitute the servocontrolled positioning means. Through the use of control signals, the recording means are controlled to assume a position corresponding to the signal valve.
By suitable alternate selection from two or more input signals, the recorder can now be made to record a variety 1~'3;~2 of functions.
The analogue values of different parameters or operating conditions can be consequtively scanned and recorded in a predetermined pattern or in an irregular sequence as may be required. As shown in Figure 6, the stylus records these para-meters as lines or bands of different thicknesses with the upper edge of the line or band representing the analogue value and the width of the line or band indicating which parameter is recorded.
Two parameters may be recorded starting from different base lines as shown in Figure 8. On the other hand, one can use a common base line by suppressing value ran~es normally not occuring or not being of interest and record one condition in the upper portion of the available total stylus travel and another in the lower portion. By switching in short time intervals the signal voltages for the servocontrolled driving means of the stylus between those of the parameters the stylus moves in short sequence between the points indicative for their value on the chart.' As shown in Figure 9, this creates a solid band of varying width. The upper borderline of the band showing the values of one and the lower borderline the value of the other parameter as an essentially continuous graph line.
The most simple type of multiple recording consists in using an input system gererally indicated at A as shown in Figure l. It consists of a control means comprising hand switch 8 with which line 9 can he connected alternatively to different voltage levels available from a voltage divider 10 which is one - form of a control signal generating means J By assigning for instance different work situations of a vehicle driver like waiting, loading and unloading to the different voltage levels, 11~36;~2 ;he occurrence of such work situations can be recorded on chart 7 by putting the hand switch in the corresponding position and by moving switch 11 to a position where it connects line 5 with line 9. Motor 3 will then move stylus 6 to positions corresponding to the voltage level selected by hand switch 8.
An automatic recording of vehicle operating conditions like engine operating parameters or conditions of auxillary equipment on a vehicle can be made by using the input system B
shown in Figure 1. Engine operating systems are in many instances presently equipped with pre-set limit switches which provide a warning signal, i.e., a warning light or a buzzer, if crucial parameters such as the coolant level, oil temperature, air pressure etc., which are automatically sensed are in a critical condition.
In input system B these warning signals would be individually connected to the control means comprising relays 12, 13, 14, etc.
These relays connect lines 15, 16, 17, etc. which take signals of different voltage levels from the control signal generating device 18 to a scanner 19. Scanner 19 continuously scans lines 15, 16, 17.
If for instance the coolant level drops below the warning point the warning signal will activate relay 12 and will therefore bring the voltage of line 15 into the scanner.
When the scanner finds this voltage it will stop for a pre-determined period and transmit via the output line 20 the cor-responding voltage to the motor 3 through switch 13 which has been set to select the mode of control supplied by input system B~ Oscillator 21 is provided in line 20. rrhis oscillator acts as a control signal pattern generating means and superimposes on the constant voltage supplied through line 15 ~rom the signal ~0 generating device 18 an oscillating voltage between zero and 6~2 one Volt. Therefore, the recordin~ stylus 6 does not remain in a steady position. It moves according to the voltage oscillation and inscribes a narrow solid band on the chart as shown in the left portion of Figure 4.
Another application of the invention is realized by using the input system C shown in Figure 1. A variety of analoque input signals as for instance rpm exhaust temperature, water temperature, oil pressure are connected to signal conditioners 22 if the direct input signals are not compatible with the required voltages on line 5. Each signal then passes through a control signal pattern generating device such as oscillators Vl, V2, V3 and V4 respectively. These control siqnal pattern qeneratinq devices superimpose an oscillating voltage which is different for each channel. Whenever one of the analogue channels is connected by switching or control means 23 to line 24 and line 24 is connected by selector switch 11 to line 5, then the corresponding analogue signal with a superimposed identifying oscillating voltaqe is recorded by stylus 6 on the chart. The chart recordings will easily allow identification of the recorded signal by the width of the inscribed band determined by the respective control signal pattern generating device.
Figure 6 shows for instance three different parameters.
RPM of the engine are recorded as thin lines. The temperature is recorded with a narrow band and the pressure is recorded by a wide band.
Recordings obtainéd without the siqnal generating device are shown in Figure 5. As can be seen, these different parameters are only recognizable when they appear ort distinct and separate locations on the chart. If these recordinq lines ~ot^
different parameters appear in the sa.~e portion of the charJ, i3~
~here is an obvious interpretation problem. This is avoided through the use of the control siqnal pattern generating device.
The applications described so far deal with situa-tions in which the parameter to be recorded is selected by hand or in which the conditions to be recorded are such that only one of them can exist at anyone time. Should, however, conditions occur simultaneously or in very short sequence of each other, a special scanning system as shown in Figure 2 presents a refinement of the invention. This scanning system can take the place of scanner 19 in the case of parameters which may occur simultaneously.
The warning limit input channels Ia and Iu, which carry signals from automatic limit switches, activate individual latches in a latching device 25. A scanning device 26 scans these latches continuously over scanning line 27 in a given sequence and connects the warning signal of the channel concerned with the output line 28 of the latch. Simultaneously, the scanning device 26 connects in the same scanning sequence, an individual pattern created by the control signal pattern generating device 29 with output iine 28 and output line 30. The scanning device controls therefore, the warning input channel which is latched. The latch signal is for a predetermined time transmitted through line 28 into the control signal pattern generating device where an identifying signal pattern is superimposed on the signal. This so modified and identified signal is sent through line 30 into the servocontrolled positioning means which moves the record-ing stvlus to a recording position.
When the control signal pattern generating device 29 receives an input through line 28, a timing device 31 is acti-vated for a predetermined timing period. During this timing ~9 period, the timing device sends a signal along line 32 t:o the 114336;~2 scanning device, thereby stopping the scanninq device and maintaining a connection between the latch and the control signal pattern generating device through line 28. The timinq device can be set to different time periods. These time periods are selected such that the event which is recorded is clearly recognizable on the chart. Therefore, to a certain extent, the timing period is dependent upon the speed at which the chart travels. At the end of the pre-set time period, the timing device sends a release signal along line 33 to the latching device thereby cutting off the signal along line 28 and a re-start signal alon~ line 32 to the scanning device, which continues its scanning until it again finds a latch in a latched condition. The cycle then reoccurs.
After having scanned all the latches in the latchinq device, the scanning device repeats its cycle of scanning. If during the next cycle one of the channels is still in the warninq mode, the warning signal reactivates the corresponding latch and this warning signal is again recorded on the chart for a pre-determined time period. If between scans the warning signal has disappeared, then there is no repeat recording o the condition.
According to a preferred embodiment of this invention, control signal pattern generating device 29 is eliminated and each of the warnin~ limit switch event channels Ia and Iu is provided with its own individual control signal pattern generating devices such as those shown in in-put system C of Figure l, marked Vl through V4.
Furthermore, the latching device can be set up such that it will only react to a signal of a certain level o a certain duration and signals below that level or duration are ~9 not latched in the latching device~ The latching device may be _ g _ L replaced by other signal storage means or memories for the storin~
of the various signals relating to the warning conditions.
Fi~ure 4 shows a warning pattern as recorded by the above-described system. The chart includes different radial fields in which the warnin~ si~nals are recorded as a band. The signal pattern carrying device may be designed to drop the voltage to zero along line 30 when no warnin~ condition exists. Figure 4 shows this arrangement in which the stylus advances from zero to radial field g for the recording of a condition. After record-ing for the period of time set by the timing device, thestylus first returns to zero and then moves to radial field i :
for the recording of a second warning condition. Again the stylus returns to zero and thereafter records in radial field 1. These recordings appear in the central portion of Figure 4.
The warning conditions recorded in radial fields ~, i, and e are not serious enough to require an immediate shut-down of the vehicle. These warning signals are therefore trans-mitted along lines Ia to the latching device.
Should the conditions become dangerous to the extent that an immediate shut-down is required and a second warninq signal from the same warning switch or a signal from a warning switch at a different signal level, is sent to the latchinq device along channels Iu, which carry information relatin~ to shut-down conditions.
The control signal pattern generating device 29 may identify the shut-down conditions in the same identifyinq radial fields a-i of Figure 4. However they are identified in a different manner. As is shown in the central portion of Fi~ure 4, the recording stylus has returned to the zero line at the centre of the chart only for the first three events. The foul^th 1~3~6~2 recorded warnill~ event, the secQ~ld one recorded in field g shows the recording stylus moving to the outer edae of the chart for all following warning recordings which relate to shut-down conditions. Therefore, the three additional events shown in fields i, g and e occurred as shut-down conditions in which case the initial warning condition had deteriorated to a shut-down condition. This recordin~ pattern can be effected by selecting a signal pattern for shut down conditions in which the stylus will receive a full voltage at the beginning and the end of each recordin~ period determined by the timing device 31.
In another application of the invention it is possible to record two parameters in an analoque fashion. Two different possibilities of recording are shown in Figure 7 and Figure 8.
These recordings are obtained by adapting switchin~
means 23 such that it automatically switches line 24 in a pre-set time pattern between the various input channels. In this case the signal conditioners 22 function in the following manner. In order to obtain the recording pattern as shown in Figure 7 in which a common base line 50 is used the signal conditioner for the rpm channel provides a volta~e to line 24 which brings the stylus into the zero position. ~7ith increases of the rpm the voltage increases and reaches a maximum at a location above the base line. Therefore, whenever line 24 is connected to V4 generating a control signal pattern relating to rpm, the stylus assumes the position between base line 50 and locations above the base line which correspond to the rpm of the motor.
In order to operate from the common base line the signal conditioners for both rpm and exhaust temperature provide identical voltages when both conditions are at zero. ~s the input signals are transmitted to the servocontrolled positioning means the stylus moves above and below the common base 'ine depending upon which condition is being recorded. If both conditions remain at zero the stylus will record along the zero line.
Figure 8 shows a modified recording pattern for recording rpm which is recorded in the upper radial fields with base line 52 and temperature which is recorded in the lower radial fields having a base line 54. As can be seen the low rpm ranqes are suppressed so that recordings start only with 1000 rpm. Temperatures under 900 are also suppressed. Further-more, temperature as well as rpm scales are arranged such that both are rising from the inside to the outside of the chart.
The voltages for engine rpm are processed such that anything up to 1000 rpm provides a constant voltage. Increases in rpm above 1000 rpm increase the signal voltages such that recordings above base line 52 are obtained on the chart.
Correspondingly the exhaust temperature voltages are processed such that no voltage is supplied to motor 3 when the temperature is below 900 degrees. However, between 900 and 1600 degrees a corresponding voltage increase will make the stylus record between the base line 54 and base line 52. This recording system allows therefore a convenient relatively larqe scale simultaneous recording of two vehicle parameters.
In addition to the recording of varying conditions, the control of vehicle conditions requires the recording of cumulative figures or the counting of events and units. This is done conventionally by recording a saw toothed pattern. The recording stylus in such a pattern is made to move between fixed top and ~ottom positions. The mechanical or electrical ~ 6~2 1 movin~ means are desiqned in such a fashion that for eac}l unit to be eounted the stylus is made to move from the bottom upwards by a certain small inerement. The number of increments or steps required to move the stylus from the bottom position to the top position is usually made equal to the number of steps required to brin~ the stylus from the top position back to the bottom position. In tachoqraph charts it is, for instance, common to make the stylus travel from the bottom to the top and the top to the bottom eclual to a distance of 5 miles travelled. If the number of units to be counted remains constant per unit of time, the resultin~ recording looks like a saw-tooth pattern. Whenever time passes without adding any additional units the up and down lines become horizontal lines if recorded on a tape or seetions of a cirele if reeorded on eircular charts.
A modified applieation of this invention eonsists in eontrollincJ the stylus in a eorrespondin~ way by electrical means to reeord or count quantities. Aqain this system can be applied in a more advaneed fashion to not only eount one but two different kind of units with one stylus. An example of such 2~ reeordings is shown in.Fi~ure 9 .
The radial fields above base line 56 constitute the recordin~ area for siqnals relating to a first quantity, i.e., packin~ cycles of a garbage collection truck. The radial fields between base lines 56 and 58 constitute the recordin~ area for information relatincJ to a second quantity, i.e., the number of ~allons of fuel consumed by the ~ehie].e.
To record the number of units of 2 different quantities it is necessary that a pulse sendinc3 unit is provided for each of the quantities to be controlled. The number o~ packaqinq cycles can, for instance, be controlled by a limit switch actuated 1 duLing each cycle of the mechanical packer, so that for each cycle one pulse is available. The number of gallons consumed by the engine can be metered by a fuel meter equipped with a pulse sending unit sending pulses for every one tenth of a gallon.
Such fuel meters are commonly used and available.
The ori~inal pulses of these sending units are then modified by a pulse shaping unit, so that the resultinq pulses are of constant amplitude and duration. These pulses are then accumulated in a ramp providing an output voltage which increases in equal increments with each pulse. After reaching a maximum voltage corresponding to the number of pulses which results in the upward travel of the stylus, the function of the ramp is reversed and the output voltage is reduced Per pulse by the same increment or drops in one step to the minimum voltaqe.
Therefore, the ramp converts the continuous pulses in a cor-responding risin~ and falling output volta~e. These risinq and fallin~ output voltages of each channel are then alternatively and in a short period cycle connected to the input line 5 for motor 3. This automatic cyclinq between the two voltaqes results in the recording pattern as shown in Figure 9 . This system also allows the mixing of recording patterns as shown in Figures 4 throu~h 9 by one instrument on the same chart. It would, for instance, be easy to have the entire recordinq pattern as shown in Figures 8 and 9, recorded in the upper radial fields and have fuel consumption recorded in the lower radial fields.
Another possible application would be to record the number of passengers in a bus at any ~iven moment in the upper part of the chart and to continuously record the number of passen-gers entering the bus in the lower part of the chart. The bottom fields would then be a quantity recordinq line while the 6~`2 1 top fields would represent the condition figure for any given moment.
In certain cases it may be an advantaae to record a multitude of events and even simultaneously occuring events at essentially the moment that they occur. Figure 3 shows a system adapted to carry out this type of recordinq. The functions of stylus guide 1, gear 2, motor 3, line 5 and feedback line 4 and chart 7 are identical to those described with respect to Figure 1. However, this system contains a modification of stylus 6 which enables the stylus to be lifted throuqh solenoid 34 from the chart surface. Solenoid 34 is controlled by relay 35 which is normally closed and lifts the stylus from the chart, so that no recordings occur. In broad terms solenoid 34 and relay 35 function as deactivating means for the recording stylus.
~ arning limit switches (not shown) provide inputs along lines 60 through 64 to individual voltage range controlled relays 36 through 40. The voltage range controlled relays contain internal controls causing them to close only within the determined voltage limits. These predetermined voltage limits are selected to correspond to the stylus position feedback voltage supplied throush line 4 such that the oil pressure relay 40 closes when the stylus is in the recordi~g range for oil pressure, that the oil level relay 39 closes when the stylus is in the recording range for oil level, etc. The result of this calibration is that during the travel of the recording stylus from its inward position to its outer position the relays close whenever the stylus is within that respective recording range. The stylus 6 is made to perform an automatic regular travel from the top position to ) the bottom position by the stylus position control voltaqe genera-1 tor 41. The speed with which this control voltage generator supplies from zero to the maximum voltage determines the speed with which the stylus 6 travels in and out with respect to the chart.
If, for instance, an oil level warning signal should be present then this signal will be transmitted through the oil level relay when stylus 6 is in the oil level range of recordinq.
Relay 35 is then activated through line 42 to open the normally closed relay. Whenever relay 35 opens the stylus is pressed against the chart by a built-in spring. ~en the stylus leaves the oil level recording range the feedback voltage through line 4 either drops below or exceeds the voltage range, openinq the oil level relay. This closes relay 35 so that the stylus is retracted to a non-recording position.
This invention which is based on the use of a signal stylus for recording a plurality of operating conditions offers the following advantages.
1. It permits a large number of on/off operating conditions ie. twenty to thirty depending on the width of the radial fields to be recorded in an easily identified manner on instruments of conventional size.
2. Existing instrument designs can be modified and used to obtain this versatile multicondition recording pattern.
3. Through the use of the present system a quick, easy to scan chart is obtained and by selecting all measurable parameters of engine and vehicle operation which are either unsafe, undesirable or technically damaging from an operational point of view, the malfunctions in the motorized 3Q vehicle can easily be detected.
1 4. A malfunction assignment of recording analosues values through the use of a single stylus is achieved by (a) selecting and manually switching from condition to condition ~b) adapting the system such that the recording automatically switches to an operating condition exceeding a preset danger level and (c) simultaneously analogue recording two operating conditions by recording their values on either side of a common base line. The latter mentioned proposal also has the ramnification that in the case of a diesel engine operation RPM can be recorded on one side of the base line and heat recorded on the opposing side of the base line. The total distance between the RPM and heat recording line is an indicator of the total power level produced by the engine from which is determined the wear on the engine.
Although various preferred embodiments of the invention have been described herein in detail, it will be apparent to one skilled in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
1 4. A malfunction assignment of recording analosues values through the use of a single stylus is achieved by (a) selecting and manually switching from condition to condition ~b) adapting the system such that the recording automatically switches to an operating condition exceeding a preset danger level and (c) simultaneously analogue recording two operating conditions by recording their values on either side of a common base line. The latter mentioned proposal also has the ramnification that in the case of a diesel engine operation RPM can be recorded on one side of the base line and heat recorded on the opposing side of the base line. The total distance between the RPM and heat recording line is an indicator of the total power level produced by the engine from which is determined the wear on the engine.
Although various preferred embodiments of the invention have been described herein in detail, it will be apparent to one skilled in the art that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Vehicle recording system for recording a multiplicity of operating conditions in a chart characterized by the combination of at least one marking means adapted to permit continuous inscribing while moving across a chart at essentially right angles to its direction of movement, servo-controlled positioning means for positioning and moving each marking means to a recording position in response to a single control signal to each marking means, the single control signal for each marking means being the result of two separate input signals superimposed with one another such that said single signal comprises both condition identifying information from one of said input signals and value indi-cating information for the identified condition from the other of said input signals for simultaneous, appropriate positioning of the marking means with respect to the chart and marking of the value of each identified operating condition, and control means to selectively direct different control signals for the multiplicity of operating conditions to the servocontrolled positioning means.
2. A recording system as claimed in Claim 1 for recording of automatically sensed operating conditions wherein said control means comprises at least two signal input channels for the multiplicity of operating conditions and switching means for alternatively connecting the positioning means to the different signal input channels.
3. A recording system as claimed in Claim 1 for recording of operator selectable operating conditions.
4. A recording system as claimed in Claim 2 including control signal generating means generating one or more control signals, or a signal from one or more automatically sensed conditions to said servocontrolled positioning means.
5. Recording system as claimed in Claim 4 for virtually simultaneous recording of two or more conditions including deactivating means for deactivating said marking means, co-ordinating control means for said signal generating means, and said deactivating means allowing selection of one or more recording patterns of the control signal, the co-ordinating control means causing the deactivating means to operate when the marking means travels outside of the select-ed recording pattern of the control signal.
6. Recording system as claimed in Calim 5 wherein said marking means comprises a stylus for marking on the chart and wherein said deactivating means comprises lifting means for lifting said stylus from the inscribing position.
7. Recording means as claimed in Claim 1 including switching means for selectively directing signals associated with different operating conditions to the positioning means, and signal pattern generating means interlocked with said switching means and superimposing a characteristic identifying signal pattern on each signal.
8. Recording system as claimed in Claim 4 for continuous virtually simultaneous analogue recording of the momentary value of two conditions including two corresponding signals wherein said switching means automatically alternatively connects the servocontrolled positioning means to either signal thereby causing the marking means to move between positions corresponding to the signals.
9. Recording system as defined in Claim 1 wherein said servocontrolled positioning means are responsive to control signals of different frequencies and wherein the control signal is characterized by its frequency which is related to one of the various operating conditions.
10. Recording system as defined in Claim 2 wherein said signal inputs are voltage level inputs relating to the various operating conditions.
11. Recording system as defined in Claim 10 for continuous analogue recording of one and two quantity conditions including input signals providing counting pulses proportion-ate in number to the quantities to be recorded, and a ramp for converting these pulses to a cyclical proportionately stepped output voltage which rises and reaches a maximum at a predetermined number of pulses and thereafter reverses and reaches a minimum at a predetermined number of pulses.
12. Recording system as defined in Claim 1 for recording simultaneous and quick sequence events including correspond-ing signals for each event, latching means for each signal, control signal pattern generating means generating a different signal pattern for each signal, timing means, and scanning means for scanning the latching means and for connecting the control signal pattern generating means with the servo-controlled positioning means, the arrangement being such that when said scanning means detects a signal the control signal pattern generating means directs a corresponding signal pattern to the servocontrolled positioning means, thereafter the timing means interrupts the scan of the scanning means which resumes its scan after a preset time of recording and opens the latching means and disconnects the signal pattern of the corresponding control signal from the servocontrolled positioning means.
13. Recording system as claimed in Claim 4 including a plurality of sensor signal sending means and scanning means for scanning the level of the sensor signals, the arrangement being such that when any one of the sensor signal sending means shows a predetermined sensor signal level a single predetermined output signal of the signal generating means relating to the one sensor signal sending means is transmitted to the servocontrolled positioning means.
14. Recording system as claimed in Claim 13 wherein the sensor signal sending means are selected from the group consisting of vehicle mounted sensors and hand actuated switches.
15. Recording system as claimed in Claim 13 including on/off signal storage means responsive to and storing on/off signal levels of predetermined duration from the sensor signal sending means, the scanning means scanning the signal storage means and connecting the appropriate output from the signal generating means with the servocontrolled posi-ioning means and resetting the signal storage means after the recording of the condition by the servocontrolled positioning means for a predetermined time span.
16. Recording system as claimed in Claim 4 including a plurality of sensor signal sending means and scanning means for scanning the level of the sensor signals, the arrange-ment being such that when the scanning means interacts with the control means a single predetermined output signal of the signal generating means relating to the one sensor signal sending means is transmitted to the servocontrolled positioning means.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA287,369A CA1103632A (en) | 1977-09-23 | 1977-09-23 | Multipurpose vehicle condition recorder |
| DE7878100961T DE2861971D1 (en) | 1977-09-23 | 1978-09-22 | Recording system for vehicle data recorder |
| EP78100961A EP0001288B1 (en) | 1977-09-23 | 1978-09-22 | Recording system for vehicle data recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA287,369A CA1103632A (en) | 1977-09-23 | 1977-09-23 | Multipurpose vehicle condition recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1103632A true CA1103632A (en) | 1981-06-23 |
Family
ID=4109607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA287,369A Expired CA1103632A (en) | 1977-09-23 | 1977-09-23 | Multipurpose vehicle condition recorder |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0001288B1 (en) |
| CA (1) | CA1103632A (en) |
| DE (1) | DE2861971D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8620596D0 (en) * | 1986-08-26 | 1986-10-01 | Veeder Root Ltd | Tachograph |
| US10685252B2 (en) * | 2018-10-30 | 2020-06-16 | Here Global B.V. | Method and apparatus for predicting feature space decay using variational auto-encoder networks |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3422440A (en) * | 1967-04-27 | 1969-01-14 | Nasa | Plural recorder system |
| DE1623761A1 (en) * | 1967-05-30 | 1971-02-04 | Hartmann & Braun Ag | Arrangement for recording the operating status of a system |
| DE2008403B2 (en) * | 1970-02-24 | 1977-11-17 | Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen | TRACKING SYSTEM, IN PARTICULAR FOR TACHOGRAPH |
| US3838445A (en) * | 1971-05-05 | 1974-09-24 | Edmac Ass Inc | Event recording system |
| NL7112273A (en) * | 1971-09-06 | 1973-03-08 | ||
| US3864731A (en) * | 1973-07-16 | 1975-02-04 | Vapor Corp | Vehicle data recorder employing data compression |
| DE2351789A1 (en) * | 1973-10-16 | 1975-04-24 | Licentia Gmbh | Recording system for transmitting electricity meters - with selective recording to reduce paper requirements and an encoder to store measured valves |
| NL7501876A (en) * | 1975-02-18 | 1976-08-20 | Ir Karel Hendrik Schlebaum Jan | ELECTROMECHANICAL REGISTRATION DEVICE FOR VOLTAGES OR CURRENTS WITH LIMIT SIGNALING. |
| NL7511987A (en) * | 1975-10-13 | 1977-04-15 | Siemens Ag | ELECTROMECHANICAL REGISTRATION DEVICE FOR VOLTAGES OR CURRENTS WITH LIMIT SIGNALING. |
| FR2334090A1 (en) * | 1975-12-05 | 1977-07-01 | Inst Nat Sante Rech Med | Automatic sampler, data compressor and recorder - records only those data and associated times indicative of changes in monitored parameter |
-
1977
- 1977-09-23 CA CA287,369A patent/CA1103632A/en not_active Expired
-
1978
- 1978-09-22 EP EP78100961A patent/EP0001288B1/en not_active Expired
- 1978-09-22 DE DE7878100961T patent/DE2861971D1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2861971D1 (en) | 1982-09-16 |
| EP0001288B1 (en) | 1982-07-28 |
| EP0001288A1 (en) | 1979-04-04 |
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