JP6220363B2 - In-vehicle operation data recording device - Google Patents

Description

  The present invention relates to an in-vehicle operation data recording device that is mounted on a vehicle as an in-vehicle device and automatically records operation data such as a traveling speed (vehicle speed) of the vehicle.

  For example, in the case of a transportation company that performs transportation work using business vehicles such as taxis, buses, trucks, etc., it is important to promote safe driving for each in-house crew member and prevent accidents in advance. Yes.

  Therefore, conventionally, in-vehicle operation data records such as digital tachographs have been used so that the managers located in the carrier's office can always check whether each crew member is actually carrying out safe driving on a daily basis. The device is being used.

  This digital tachograph is installed in each vehicle such as taxi, bus, truck, etc., and information such as speed and engine speed acquired every fixed time (for example 0.5 seconds) is automatically stored in a storage device such as a memory card. To record.

  Therefore, the administrator reads the data collected by the digital tachograph from the memory card using, for example, an analysis program installed in a personal computer installed in the sales office, and examines this data in detail to For each crew member, the travel time, travel distance, maximum speed, average speed, overspeed time, number of overspeeds, engine speed overtime and overspeed, sudden start, rapid acceleration, rapid deceleration, idling time, etc. It is possible to promote safe driving and economical driving for each crew member based on the grasped result.

  On the other hand, a general vehicle is provided with a speed sensor (that is, a vehicle speed sensor) that detects the rotation of the output shaft of the transmission. Such a speed sensor outputs a pulse signal each time the output shaft rotates a predetermined amount. Therefore, it is possible to grasp the moving distance of the vehicle based on the number of pulses of the pulse signal output from this speed sensor, or grasp the traveling speed of the vehicle based on the number of pulses within a certain time or the cycle of the pulse. is there.

  In addition, “Technical standards for operation recorders” are stipulated in “Attachment Annex 89 that defines the details of safety standards for road transport vehicles” by the Ministry of Land, Infrastructure, Transport and Tourism. In other words, the digital operation recorder needs to clearly indicate the number of input pulses per unit travel distance or its abbreviated symbol. In addition, it is necessary that the specification of the input pulse signal or the list of model names of connectable travel sensors be specified.

  Therefore, it is necessary to configure an operation recorder such as a digital tachograph so as to meet such technical standards. Therefore, for example, in the operation data recording system disclosed in Patent Document 1, the pulse signal output from the speed sensor is configured to be input to the digital tachograph. In this case, the digital tachograph can grasp the travel distance and travel speed of the vehicle based on the input pulse signal. In addition, since “the number of input pulses per unit travel distance” can be grasped, it can be configured to meet the technical standards.

  In the speed detection device disclosed in Patent Document 2, a pulse signal is detected, a pulse period is measured, and an average pulse period is calculated and a traveling speed is calculated based on the number of pulse counts.

  Moreover, patent document 3 has shown the vehicle speed signal converter connected between a vehicle speed sensor and an operation recorder. This vehicle speed signal conversion device performs signal conversion for inputting a prescribed pulse signal to an operation recorder regardless of the reduction ratio of the drive shaft.

JP2013-137610A JP 2000-206132 A JP 2003-149259 A

  Normally, it is necessary to input a speed pulse output from a vehicle speed sensor to an in-vehicle device that records vehicle speed operation data such as a digital tachograph so as to conform to the above technical standards. However, since there are various types of vehicle speed sensors connected to the digital tachograph, the number of pulses per unit travel distance of the vehicle varies depending on the type of vehicle speed sensor used. Moreover, the number of pulses per unit mileage varies depending on the type of vehicle on which the digital tachograph is mounted and on each vehicle.

  Therefore, for example, a vehicle speed signal converter as disclosed in Patent Document 3 may be used. In recent years, special tweaking software has been used to make individual adjustments to digital tachographs before shipment or before use, resulting in different types of connected vehicle speed sensors, different types of vehicles, and different types of vehicles. The digital tachograph is configured so as to allow changes such as and obtain a prescribed measurement result.

  However, since the above adjustment work must be performed in an actual traveling state for each vehicle, it is very troublesome and the work cost is inevitable.

  Even if the digital tachograph is adjusted in advance to obtain the specified measurement result, the measured value of the vehicle speed detected by the digital tachograph and the standard speedometer installed on the vehicle (speedometer) There is a deviation from the indicated value (display value). In addition, there is an individual difference in the amount of deviation, and variation occurs due to the influence of the difference in the vehicle type and the difference in the contents of the adjustment work.

  Usually, both a vehicle speedometer and a digital tachograph perform measurement by inputting a speed pulse output from a common vehicle speed sensor mounted on the vehicle. Therefore, the difference between the measured values of both occurs due to differences in signal processing, calculation methods, adjustment states, and the like inside each vehicle-mounted device.

  By the way, in a normal vehicle, various in-vehicle devices are connected to each other via a communication network such as a CAN (Controller Area Network). In addition, if this communication network is used, it is also possible to acquire travel speed information that is a measurement result of the vehicle speedometer. However, since the digital tachograph must clearly indicate “number of input pulses per unit mileage” in order to be configured to meet the above technical standards, it is possible to obtain travel speed information directly from the communication network. Even so, there is a restriction that this cannot be actually used.

  The present invention has been made in view of the above situation, has a configuration that conforms to technical standards, reduces the burden on adjustment work, and generates a relative shift in measured values with respect to the vehicle speed output by the speedometer. It is an object of the present invention to provide an in-vehicle operation data recording device capable of suppressing the above.

The above object of the present invention is achieved by the following configuration.
(1) An in-vehicle operation data recording device that is mounted on a vehicle and automatically records operation data including a traveling speed of the vehicle,
A speed pulse interface for inputting a signal of a predetermined speed pulse generated as the vehicle travels;
A communication interface having a function of performing data communication with a communication network existing on the vehicle;
Speed information indicating the current traveling speed of the vehicle measured by a speedometer of a meter unit mounted on the vehicle that performs data communication with the communication network based on the signal of the speed pulse, and the communication interface Via the communication network via the speed information acquisition unit,
Based on the speed information acquired by the speed information acquisition unit and the signal of the speed pulse input to the speed pulse interface, without performing calculation for obtaining a traveling speed from the signal of the speed pulse, the unit A pulse number information calculation unit that calculates pulse number information that is the number of input pulses per mileage ;
A pulse number information output unit for outputting the pulse number information;
A recording unit that records the speed information acquired by the speed information acquisition unit as a traveling speed included in the operation data;
It is provided with.

  According to this in-vehicle operation data recording device, the speed information is acquired from the communication network via the communication interface, so the measured value of the speed handled by the device itself as operation data becomes common with the speedometer of the own vehicle. , No relative deviation occurs. Moreover, it is not necessary to handle the speed pulse signal for the speed measurement value, and calculation and adjustment work are unnecessary. In addition, since the pulse number information calculation unit calculates the pulse number information and the pulse number information output unit outputs the pulse number information, the configuration conforms to the above-mentioned “technical standard for operation recorder” It can be.

(2) In the in-vehicle operation data recording device according to (1),
The pulse number information calculation unit calculates the pulse number information based on a signal period in the speed pulse and the speed information.
It is characterized by that.

  According to this in-vehicle operation data recording device, since the calculation is performed using the signal period of the speed pulse and the speed information, a highly accurate calculation result can be obtained in a short time without waiting until a large number of pulses appear. Is obtained.

(3) In the in-vehicle operation data recording device according to (1),
The pulse number information output unit automatically identifies whether or not the recording of the pulse number information is necessary, and if necessary, after detecting a predetermined input operation from the user, the calculated pulse number Save the information in a predetermined recording area,
It is characterized by that.

  According to this in-vehicle operation data recording device, the calculated pulse number information can be stored and read at any time. Accordingly, the “number of input pulses per unit travel distance” required by the “technical standard of the operation recorder” described above can be output even if the vehicle is not in a travel state. Also, by detecting the user's input operation, the pulse number information can be acquired and stored at an appropriate timing.

(4) In the in-vehicle operation data recording device according to (1),
The pulse number information output unit outputs the content of the pulse number information to a predetermined display.
It is characterized by that.

  According to this in-vehicle operation data recording device, the contents of the pulse number information can be displayed, so that the above-mentioned requirement of “technical standard for operation recorder” is satisfied.

  According to the in-vehicle operation data recording device of the present invention, it has a configuration that conforms to technical standards, and can reduce the burden on adjustment work and suppress the occurrence of relative deviation of measured values with respect to the vehicle speed output by the vehicle speedometer. It becomes possible. That is, since the speed information is acquired from the communication network via the communication interface, the measured value of the speed handled by the device itself as the operation data becomes common with the speedometer of the own vehicle, and no relative deviation occurs. . Moreover, it is not necessary to handle the speed pulse signal for the speed measurement value, and calculation and adjustment work are unnecessary. In addition, since the pulse number information calculation unit calculates the pulse number information and the pulse number information output unit outputs the pulse number information, the configuration conforms to the above-mentioned “technical standard for operation recorder” It can be.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a block diagram showing a configuration of an in-vehicle operation data recording device according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration example of the in-vehicle system. FIG. 3 is a flowchart showing the operation of the in-vehicle operation data recording device in the embodiment of the present invention. FIG. 4 is a waveform diagram showing an example of the signal waveform of the speed pulse signal.

  Specific embodiments relating to the present invention will be described below with reference to the drawings.

<In-vehicle system configuration example>
The structural example of the vehicle-mounted system containing the vehicle-mounted operation data recording device of this invention is shown in FIG. In FIG. 2, the digital tachograph body 10 corresponds to the in-vehicle operation data recording device of the present invention.

  In the configuration example shown in FIG. 2, in-vehicle communication networks 30 and 31 are formed on the vehicle. The in-vehicle communication networks 30 and 31 are connected to each other via a gateway 35. On the in-vehicle communication network 30 side, the digital tachograph body 10 and a plurality of on-vehicle devices 32, 33, and 34 are connected.

  The digital tachograph main body 10 is an in-vehicle device having a function of automatically acquiring and recording various operation data including the traveling speed of the vehicle. As shown in FIG. 2, the speed pulse signal SG <b> 1 output from the speed sensor 21 mounted on the vehicle is input to the digital tachograph body 10.

  The speed sensor 21 is disposed in the vicinity of the output shaft of the vehicle transmission, and outputs a pulse signal each time the output shaft rotates by a predetermined amount. Therefore, the period and the number of pulses of this pulse signal change according to the travel speed and travel distance of the vehicle. However, depending on the type of speed sensor 21, the type of vehicle, the difference in the vehicle (for example, the outer diameter of the tire), etc., the correspondence relationship between the cycle of the pulse signal, the number of pulses, the actual travel speed of the vehicle, and the travel distance Change.

  The digital tachograph body 10 records operation data as digital data on a nonvolatile recording medium. Further, the digital tachograph body 10 of the present embodiment has a communication function for connecting to the in-vehicle communication network 30.

  As one of the vehicle-mounted devices 32, 33, and 34, for example, there is a meter unit. The meter unit incorporates various instruments such as a speedometer (speedometer), a tachometer (engine tachometer), and an odometer. The speedometer of the meter unit measures the traveling speed, that is, the traveling distance (km / h) per hour based on the speed pulse signal SG1 output from the speed sensor 21. Moreover, the meter unit can send the measurement result of the speedometer to the in-vehicle communication network 30 as speed information. Therefore, various on-vehicle devices other than the meter unit can also refer to the speed information of the speedometer. Moreover, since the digital tachograph main body 10 is also equipped with a communication function, it is possible to refer to speed information of a speedometer sent from the meter unit.

<Configuration of digital tachograph body 10>
The configuration of the in-vehicle operation data recording device in the embodiment of the present invention is shown in FIG. As shown in FIG. 1, a digital tachograph body 10 includes a microcomputer (CPU) 11, a nonvolatile memory 12, a volatile memory 13, a clock circuit (RTC: real time clock) 14, an EEPROM 15, a speed pulse input interface (I / F). ) 16, a power supply unit 17, an LCD controller 18, and a CAN transceiver 19.

  The microcomputer (CPU) 11 performs a process necessary for controlling the digital tachograph main body 10 by executing a program held on the EEPROM 15. As contents of main control, the microcomputer 11 collects various information indicating the operation state during the business operation of the vehicle, and records and stores the obtained digital data. Other characteristic control will be described later in detail.

  The non-volatile memory 12 is a storage device that can hold stored information even when the power supply supplied from the power supply unit 17 is interrupted, and can write and read information. The non-volatile memory 12 is used to hold information necessary for the operation of the digital tachograph main body 10, registration information regarding crew members, collected operation data, and the like. The nonvolatile memory 12 is configured in the form of a memory card, for example, and is connected to the digital tachograph body 10 in a detachable state.

  The volatile memory 13 is a semiconductor memory in which information can be written and read, and is accessed by the microcomputer 11 for writing and reading data temporarily used when power is supplied from the power supply unit 17. Is done.

  The clock circuit 14 constantly counts predetermined clock pulses having a constant cycle, and can grasp the current date and time and output the information.

  An EEPROM (Electrically Erasable Programmable Read-Only Memory) 15 holds programs and data necessary for the operation of the microcomputer 11 in advance. The microcomputer 11 reads a program and data from the EEPROM 15 and executes a predetermined operation in accordance with this program.

  The speed pulse input interface (I / F) 16 performs signal processing for shaping the speed pulse signal SG1 output from the speed sensor 21 into a signal suitable for the signal input of the microcomputer 11.

  The power supply unit 17 is a power supply circuit for converting the voltage of the power supply circuit (battery output) of the vehicle into a stable predetermined voltage (for example, +5 [V]) that can be used as a power supply by the microcomputer 11.

  The LCD controller 18 has a function of controlling the display content of the display 22 constituted by a liquid crystal display (LCD) device. The microcomputer 11 can control the display content of the display 22 via the LCD controller 18.

  The CAN transceiver 19 is an interface for performing CAN (Controller Area Network) standard data communication. The CAN transceiver 19 is connected to the in-vehicle communication network 30 shown in FIG. The microcomputer 11 can acquire the speed information Dsp from other on-vehicle equipment (any of 32-34) via the in-vehicle communication network 30 and the CAN transceiver 19.

  The operation unit 23 has a plurality of operation buttons that can be operated by the user. The microcomputer 11 can read the user's input operation by monitoring the state of each operation button of the operation unit 23.

<Operation of Digital Tachograph Body 10>
A characteristic operation in the digital tachograph body 10 is shown in FIG. That is, the microcomputer 11 in the digital tachograph body 10 executes the operation of FIG. Further, this operation is performed when the vehicle is transported by land, that is, in the traveling state of the vehicle before being used by the vehicle user.

  When the microcomputer 11 detects in step S11 that the ignition of the vehicle has been turned on (IGN-ON), the microcomputer 11 proceeds to the next step S12.

  In step S <b> 12, the microcomputer 11 sends the speed information Dsp via the CAN transceiver 19 from the network information sent to the in-vehicle communication network 30 by the on-vehicle equipment (any of 32-34) such as a meter unit. get. If the speed information Dsp does not appear on the in-vehicle communication network 30, the microcomputer 11 requests the meter unit to send the speed information Dsp. The speed information Dsp is information having the same value as the traveling speed [km / h] currently displayed by the speedometer in the meter unit.

  In step S13, the microcomputer 11 calculates a value corresponding to the “number of input pulses per unit travel distance” required in the “technical standard of the operation recorder”. Specifically, first, the speed pulse signal SG1 output from the speed sensor 21 is input to the microcomputer 11 via the speed pulse input interface 16, and the speed pulse period Tsp [sec] is measured. For example, the rising timing of the voltage of the speed pulse signal SG1 from the low level (Lo) to the high level (Hi) is detected, the time counting is started, and the elapsed time until the next rising timing is detected is the speed. The pulse period is Tsp (see FIG. 4).

Next, the speed pulse number Np is calculated by the following formula based on the speed information Dsp and the speed pulse period Tsp.
Np = 3600 / (Dsp · Tsp) (1)

  Therefore, for example, when the speed information Dsp is 60 [km / h] and the speed pulse period Tsp is 0.1 [sec], Np = 600 [pulse / km].

  In step S14, the microcomputer 11 identifies whether or not recording of the speed pulse number Np is necessary. For example, it is checked whether or not the speed pulse number Np has already been recorded in a predetermined area on the nonvolatile memory 12, and if it has not been recorded yet, it is considered that recording is necessary. Further, when data update is instructed by operating the button of the operation unit 23, it is considered that recording is necessary even when the speed pulse number Np is already recorded. If recording is not necessary, the process proceeds to S17, and if recording is necessary, the process proceeds to S15.

  In step S15, the microcomputer 11 monitors the state of the operation unit 23, waits until a predetermined button operation is performed on the operation unit 23, and proceeds to the next step S16 by detecting the button press. In addition, while waiting in S15, the same process as step S13 may be repeatedly executed to update the speed pulse number Np sequentially.

  In step S16, the microcomputer 11 records the data of the speed pulse number Np calculated in S13 in the nonvolatile memory 12.

  In step S <b> 17, the microcomputer 11 displays the data on the speed pulse number Np calculated in S <b> 13 or the data on the speed pulse number Np held in the nonvolatile memory 12 on the display 22. By this display, the “number of input pulses per unit travel distance” required in the “technical standard of the operation recorder” is clearly indicated.

  On the other hand, in the normal operation state of the vehicle, as in step S12, the microcomputer 11 acquires the speed information Dsp from the in-vehicle communication network 30, and records this speed information Dsp on the nonvolatile memory 12 as the vehicle speed of the operation data. To do.

  Here, since the speed information Dsp recorded as operation data and the vehicle speed displayed by the speedometer of the meter unit mounted on the same vehicle are common information, there is no deviation between the two. In addition, since the calculation for obtaining the speed from the speed pulse signal SG1 is not performed inside the digital tachograph body 10, adjustment for correcting the speed even if the type of the speed sensor 21, the type of the vehicle, or the vehicle changes. There is no need to perform work on the digital tachograph body 10. Therefore, the cost of work can be reduced, and there is no fear that individual differences in speed calculation characteristics occur for each digital tachograph body 10.

  In step S13 in FIG. 3, the speed pulse number Np is calculated based on the speed pulse period Tsp. Therefore, it is not necessary to count a large number of pulses, and the speed pulse number Np can be calculated with high accuracy in a short time. . The speed pulse number Tp may be calculated after measuring the speed pulse period Tsp for each of a plurality of periods and averaging the results.

  In the configuration example of FIG. 1, the CAN transceiver 19 is used. However, it may be possible to change the communication interface to an appropriate communication interface in accordance with the change of the communication specification of the in-vehicle communication network 30 to be connected.

  In addition, although the case where this invention is applied to the digital tachograph main body 10 is assumed, the structure and operation | movement similar to the digital tachograph main body 10 are added to the drive recorder which is the vehicle equipment which has the function similar to a digital tachograph, for example. It is also possible to do. Also, operation data other than vehicle speed information can be acquired by the digital tachograph body 10 from the in-vehicle communication network 30 and recorded.

  Here, the features of the above-described embodiment of the in-vehicle operation data recording device according to the present invention will be briefly summarized in [1] to [4] below.

[1] An in-vehicle operation data recording device that is mounted on a vehicle and automatically records operation data including a traveling speed of the vehicle,
A speed pulse input interface (16) for inputting a signal (speed pulse signal SG1) of a predetermined speed pulse generated as the vehicle travels;
A communication interface (CAN transceiver 19) having a function of performing data communication with a communication network (in-vehicle communication network 30) existing on the vehicle;
A speed information acquisition unit (microcomputer 11, S12) for acquiring speed information (Dsp) representing the current traveling speed of the vehicle from the communication network via the communication interface;
Based on the speed information acquired by the speed information acquisition unit and the signal of the speed pulse input to the speed pulse interface, a pulse number information calculation unit (micro Computer 11, S13);
A pulse number information output unit (microcomputer 11, S17) for outputting the pulse number information;
An in-vehicle operation data recording device comprising:

[2] The pulse number information calculation unit calculates the pulse number information (speed pulse number Np) based on a signal period (Tsp) in the speed pulse and the speed information (Dsp).
The in-vehicle operation data recording device as described in [1] above.

[3] The pulse number information output unit automatically identifies whether or not the recording of the pulse number information is necessary (S14), and if necessary, detects a predetermined input operation from the user (S15). After that, the calculated pulse number information is stored in a predetermined recording area (S16),
The in-vehicle operation data recording device as described in [1] above.

[4] The pulse number information output unit (S17) outputs the content of the pulse number information to a predetermined display (22).
The in-vehicle operation data recording device as described in [1] above.

10 Digital tachograph body 11 Microcomputer (CPU)
12 Nonvolatile memory 13 Volatile memory 14 Clock circuit 15 EEPROM
16 Speed Pulse Input Interface 17 Power Supply Unit 18 LCD Controller 19 CAN Transceiver 21 Speed Sensor 22 Display Unit 23 Operation Unit 30, 31 On-vehicle Communication Network 32, 33, 34 On-vehicle Equipment 35 Gateway SG1 Speed Pulse Signal Dsp Speed Information Np Speed Pulse Number

Claims (4)

An in-vehicle operation data recording device that is mounted on a vehicle and automatically records operation data including the traveling speed of the vehicle,
A speed pulse interface for inputting a signal of a predetermined speed pulse generated as the vehicle travels;
A communication interface having a function of performing data communication with a communication network existing on the vehicle;
Speed information indicating the current traveling speed of the vehicle measured by a speedometer of a meter unit mounted on the vehicle that performs data communication with the communication network based on the signal of the speed pulse, and the communication interface Via the communication network via the speed information acquisition unit,
Based on the speed information acquired by the speed information acquisition unit and the signal of the speed pulse input to the speed pulse interface, without performing calculation for obtaining a traveling speed from the signal of the speed pulse, the unit A pulse number information calculation unit that calculates pulse number information that is the number of input pulses per mileage ;
A pulse number information output unit for outputting the pulse number information;
A recording unit that records the speed information acquired by the speed information acquisition unit as a traveling speed included in the operation data;
An in-vehicle operation data recording device comprising: The pulse number information calculation unit calculates the pulse number information based on a signal period in the speed pulse and the speed information.
The in-vehicle operation data recording device according to claim 1. The pulse number information output unit automatically identifies whether or not the recording of the pulse number information is necessary, and if necessary, after detecting a predetermined input operation from the user, the calculated pulse number Save the information in a predetermined recording area,
The in-vehicle operation data recording device according to claim 1. The pulse number information output unit outputs the content of the pulse number information to a predetermined display.
The in-vehicle operation data recording device according to claim 1.

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