JPH0396864A - Vehicle data measuring instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to measuring the driving condition of a vehicle, and in particular, to measuring the driving condition of a competition vehicle to identify the position of the vehicle and measure the lap time. Regarding.

<<Prior Art>> As a conventional measuring device for measuring lap time, there is one shown in FIG. 10, for example. That is, this measuring device is configured such that a light emitting element 2 is attached to a competition vehicle 1 running on a circuit, and a light receiving element 3 is installed at a predetermined position on the circuit to specify a measurement point. The element 3 detects the moment when the light emitting element 2 attached to the vehicle 1 passes, and this detection output is sent to the timing device 5 via the amplifier 4 to measure the lap time for each lap. .

<<Problems to be Solved by the Invention>> However, in such a conventional lap time measuring device, a light emitting element 2 is attached to a competition vehicle 1 running on a circuit, and a light emitting element 2 is attached to a competition vehicle 1 running on a circuit. Since the configuration was such that the lap time was measured by specifying the measurement point by installing the light receiving element 3 connected to the amplifier 4 and the timing device 5, there was no problem in measuring the lap time for each lap, but the circuit There was a problem that was extremely impractical when measuring the passing time of an arbitrary section in ``2''.

That is, when measuring the passage time of the above-mentioned arbitrary section, the measuring point is specified by placing a photodetector 3 in advance at each position of the arbitrary section, and the photodetector 3 is Since it is configured to be connected to the timing device 5, according to this configuration, each time the section for which the passing time is to be measured changes or the number of sections for which the passage time is to be measured increases, the light-receiving element 3 is placed at each position in that section for measurement. Since the location must be specified and the light receiving element 3 must be connected to the timing device 5 via the amplifier 4, there is a problem that the installation work is cumbersome and impractical.

<<Means for Solving the Problem>> This invention was made in view of the circumstances mentioned in -1- above, and its purpose is to easily solve the problem by specifying the position of the vehicle on the circuit. It is an object of the present invention to provide a timing device capable of measuring the lap time of one round and the passing time of an arbitrary section.In order to achieve the above object, the present invention is structured as shown in FIG.

This invention transmits the driving pattern of a driver driving a vehicle on a circuit using a tenometer, which has been widely used in recent years as a transmission means, and identifies the position of the vehicle on the circuit based on the transmitted data. It is.

The measuring means a measures data representing the driving state of the vehicle.

The transmitting means b transmits the data measured by the -1 second wave measuring means a.

The receiving means C receives the data transmitted by the -1 second transmitting means b.

The sampling means d samples the -1- data at predetermined intervals.

The FIR filter e has coefficients determined based on the sampled data, and the received data is input to this FIR filter to specify the position of the vehicle according to its output.

(Embodiment) Hereinafter, a first embodiment of the vehicle data measuring device related to this hitting will be described in detail using FIGS. 2 to 7.

Note that the same parts as in the above conventional example are designated by the same reference numerals, and detailed explanation thereof will be omitted.

The vehicle data measuring device of the present invention is equipped with a measuring means for measuring data representing the driving state of the vehicle in the vehicle 1, and this measuring means measures, for example, the engine speed, which is already widely available on the market. This is a microcomputer 6 for electronic control of an engine, which is also used in cars.

Further, a telemeter 7 as a transmitting means is connected to the microcomputer 6, and the data of the engine rotation speed measured by the microcomputer 6 is transmitted from the transmitting antenna 8 of the telemeter 7. The receiving antenna 9 receives the transmitted data, and the received data is inputted to a data processing device 11 such as a personal computer workstation via a receiver 10 and a serial line such as RS232C, and is then processed by software. The system is configured so that it can be used to identify the location of a vehicle and take measurements such as lap time.

Next, a data processing method for specifying the position of a vehicle as described above will be explained.

What is shown in FIG. 3 is representative time-series change data of the engine speed in a predetermined section measured by the microcomputer 6 when the vehicle 1 is running on the circuit. The time-series change data of the rotation speed is extremely stable for each lap when driven by a professional driver, and has the reproducibility that something similar to the above-mentioned time-series change always occurs when driving in the specified section specified by -L. By using this reproducibility and performing data processing to search for locations where the time-series change data of engine speed is the same, the location of the car in Zarkit 2 can be determined.

That is, the position of the vehicle as described above can be specified by data processing using an FIR filter, and then this F
The coefficients to be used in the IR filter are determined, and the FIR filter provided with the determined coefficients will be described with reference to FIGS. 3 to 5.

6 To determine the coefficients to be used in the FIR filter, first, as shown in FIG. There it is,
Focusing on the engine rotation speed data shown in section A of Fig. 3, this data is shown in Fig. 4, and this data is sampled at predetermined time intervals Δt, and this sample data is
or a7.

In addition, in order to set an offset of 1 so that the entire sample data of ]-notes a1 to a7 becomes an average value of 0,
By substituting a7 into equation (1) and converting it into b1 to b7, the coefficients used in the FIR filter are determined.

b i - ai - Σai/7-(1) Therefore, -1
The two FIR filters are b, ~b7 determined as above.
It is constructed as shown in Fig. 5 based on the coefficients of It is. Also,
14 is a time delay element Z-0 for n samples, and the data before and after this element Z-0 is a function u (m-n) when the human power value is u (m). It is expressed as u (m-2n), ゜゛u (m-6n), where n is the value obtained by dividing Δt shown in Fig. 4 by the sample interval that is the A section of the human signal shown in Fig. 3. be.

Therefore, according to the configuration of the FIR filter as shown in Section 12, the engine rotation speed data shown in FIG. 7(a) (equivalent to FIG. 3) is input from the leftmost input terminal, and from the rightmost output terminal.
The output of the second FIR filter can be obtained.

In addition, the time interval Δt and the number of sample data are set so that similar waveforms are not detected in other parts of the circuit-1-, that is, so that similar time-series data does not appear as a result of sampling. Choose empirically.

Further, in FIG. 4, the time intervals Δt are set to be equal intervals, but in order to best express the characteristics of the time series data, the time intervals Δt may be set to unequal intervals.

Next, the actual software processing for determining the position of the vehicle and measuring the lap time based on the FIR filter configured as shown in the following description will be explained using the flowchart shown in FIG.

The flowchart described in ``2'' is executed each time one piece of engine rotation speed data is manually inputted to the data processing device 11 from the telemeter 7, and the manually inputted data is stored in the memory in the data processing device 11 described in ``2. Ru.

When the latest data u(m) is input (step 100), n previous data u(m) necessary for the FIR filter calculation are selected from the past data string stored in the memory. -n) and 2n previous data u
(m-2n), 3n previous data u(m-3n)...
- A total of 6 pieces of past data including 60 pieces of previous data u(m-6n) are read (step 101).

Then, find the average value U of the latest data in Section 2 and the past 6 data, that is, a total of 7 data, and calculate this average value U. Subtract from u'(m), u'(9 m-n), u'(m 2n)...u'(m-6n)
is calculated (step 1-02), and the calculation of the FIR filter shown in FIG. 5 is executed using this calculation result.

That is, the calculation formula is as shown in formula (2), and the above calculation result is substituted into formula (2) to obtain the output y (m) of the FIR filter (step 103).

6 y (m) = Σb, tu'(m-ni)- (2
)]-0 Also, it is determined whether the above-mentioned FIR filter output y (m) is greater than or equal to a predetermined comparison value (step 103), and if this output y (m) is greater than or equal to the predetermined comparison value, (7th
(see figure), the current time T(m) is stored using the internal clock function in the data processing device 11 (step 1).
05).

Furthermore, the fact that y (m) above has exceeded the predetermined value means that the same time-series changes in data have appeared since this filter is a so-called matched filter. Since the vehicle was traveling at the same point above, the vehicle's position was specified at this 10 point. By subtracting the time memorized this time from the time memorized in the same way as in the previous section 2, the location of the vehicle was determined as 1.
The lap time of the lap is measured (step 106).

Therefore, as is clear from the description in ``Zerkit'' 2, it is possible to determine the lap time for one lap by specifying the position of the vehicle without installing a measurement mechanism such as a light receiving element on the ``Zerkit'' and specifying the measurement point. ill can be determined.

In the seventh part, the input data waveform u (m) input manually in step 100 of Flowchart 1 is (a), and the output waveform y (m) of the FIR filter in step 103 is (b). The output waveform y (m) of the FIR filter also takes negative values, but these are not shown and only positive values are shown.According to this, the two matched filters are constructed. Among the input data waveforms u (m), at the moment a7 is manually input in step 100, the output y (m) of the FIR filter appears as the largest waveform in step 103, exceeding a predetermined comparison value.

11 Next, a second embodiment of the vehicle data measuring device of the present invention will be described using the flowchart shown in FIG.

In this second embodiment, in addition to the first embodiment which measures the lap time for each lap of the circuit, the passing time of a specific BC section on the circuit is measured. Point B and C specified in 2.
An FIR filter (match 1 filter) corresponding to the point is configured.

That is, in the FIR filter shown in FIG. 5, the FIR filter shown in FIG.
The FIR filter (B) that calculated i and the FIR filter (C) that calculated the multiplication coefficient bi corresponding to the above point C
It is.

Thus, the latest data is input (step 100),
Read the past data necessary for the FIR filter calculation (step 101), find the average value of the J2 latest data and past data, and subtract this average value from both of the above data (
The process up to step 102) is similar to that of the first embodiment, and then the FIR corresponding to point B with the above configuration is
The calculation of the filter (B) is executed (step 107), and it is determined whether the output of the FIR filter (B) is greater than or equal to a predetermined value (step 1.08). has passed point B, so the current time TB is stored (step 109).

On the other hand, if it is determined that the output of the FIR filter (B) is less than or equal to the predetermined value, the subtraction result in step 102 is used to calculate the FIR filter (C) corresponding to point C having the configuration as described in 2. (step 110), and determines whether the output of the FIR filter (C) is less than or equal to a predetermined value (step 111), and if the output of L is less than or equal to a predetermined value, has passed point C, so the current time Tc is stored (step 112).

Then, TC-TB is calculated from the two times TB and Tc (step 113), and the passage time of a specific BC section on the circuit can be measured.

Of course, it is also possible to increase the number of detection points or to set the number of detection points to 13 and find the lap time for one lap from the difference between the previous time and the current time.

Therefore, during an actual race, it may not be possible to run the same way every lap due to the relationship with other vehicles, especially overtaking. Since the lap time for one lap can be measured at the point, detection errors can be prevented.

Next, a third embodiment of the vehicle data measuring device of the present invention will be described using flowchart 1 shown in FIG.

In this third embodiment, as shown in the part where gear shifts are performed continuously as shown by the solid line arrows in Figure 3, the engine speed data changes significantly even with a time difference of 0.1 seconds. , which corresponds to the case where it is difficult to configure the above FIR filter, and in such a case, the input data u
(m) is passed through a low-pass filter that removes the gear shift waveform, and then the flowchart shown in Figures 6 and 8 =
14. Data processing may be performed based on the data.

Then, the latest input data u (m) is input manually (step 100), and then u' (m) is obtained by applying a low-pass filter G (Z) to the above u (m) (step 114), Below, using this u'(m), the sixth
By performing the processing shown in Fig. 8 and Fig. 8, 1
It is possible to measure the lap time of a lap and the passing time of a specific section.

Therefore, by using the low-pass filter as described above, the FIR filter can be configured even in a place where gear shifts are being performed continuously, so the number of points where the filter can be configured, that is, the points where passing of a vehicle can be detected increases.

In addition, 1. In the first to third embodiments, the engine's electronic control microcomputer was used as the measuring means to measure the engine speed data, but instead of this, throttle opening data or intake pipe negative pressure data could be used. In order to improve the accuracy of the lap time of one lap and the passing time of a specific section]-5, the engine rotation speed data can be In addition to processing the data as described above, the throttle opening degree data, intake pipe negative pressure data, etc. may be processed in the same manner as described in -1- above, and the position of the vehicle may be specified based on the logical product or arithmetic product thereof.

<<Effects of the Invention>> As explained above, according to this system, the data representing the driving state of the vehicle measured by the measuring means is transmitted by the transmitting means, while the receiving means transmits the data described in "2". This received data was input to an FIR filter, and the position of the vehicle was determined according to the output of the FIR filter. ．． ．． By installing measurement equipment such as a light receiving element on the second side, it is possible to specify measurement points for measuring one lap time and passing time of a specific section without specifying the measurement point, so it is possible to measure practical lap times and specific sections. It is possible to provide a measurement device that measures the transit time of

[Brief explanation of drawings]

16 Fig. 1 is a diagram corresponding to complaints, Fig. 2 is an explanatory diagram showing an outline of the vehicle data measuring device according to the present invention, Fig. 3 is a graph showing a time-series change in engine rotation speed, and Fig. 4 is a graph showing a change in engine speed over time. FIG. 5 is a block diagram of the FIR filter used in the vehicle data measurement device of the present application; FIG. 6 is a first embodiment of the flowchart used in the vehicle data measurement device of the present application; FIG. (a) is a graph showing the time-series change in the engine speed, and FIG. 7(b) is a graph showing the output of the FIR filter when the time-series change data shown in FIG. 8 is input to the FIR filter. is a second embodiment of the flowchart of the present vehicle data measuring device,
FIG. 9 is a third embodiment of a flowchart used in the vehicle data measuring device of the present application, and FIG. 10 is an explanatory diagram showing an outline of a conventional measuring device for measuring lap times. 6...Microcomputer 7...Telemeter 10...Receiver 11...Data processing device 17 -471- Bayo

Claims (1)

[Claims] 1. Measuring means for measuring data representing the driving state of the vehicle, transmitting means for sequentially transmitting the data to the base station, receiving means for receiving the transmitted data, and sampling the data at predetermined intervals. sampling means;
and an FIR filter having coefficients determined based on the sampled data, the vehicle is characterized in that the received data is input to the FIR filter and the position of the vehicle is specified according to the output thereof. Data measurement device.