JPH0379205B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a constant speed traveling device for a vehicle, and particularly to an abnormality diagnosis device therefor.

[Prior art]

An abnormality diagnosis device for a constant speed traveling device is a device that diagnoses whether a failure has occurred in each part of the constant speed traveling device, such as the vehicle speed sensor or actuator, and displays the diagnosis result based on an external command. When an abnormality diagnosis device is added to a constant speed traveling device, in addition to the electric circuit for performing abnormality diagnosis processing, the command switch for outputting the diagnosis results of the abnormality diagnosis device will display the presence or absence of a failure. It is necessary to add a display device for this purpose. As for the electric circuit for performing abnormality diagnosis processing, only a small number of electronic circuits are added, so the device is hardly enlarged, and in particular, the constant speed traveling device incorporates microcomputer control. If there is
Since you only need to increase the number of programs, the device will not become larger. However, it is difficult to find space for new switches and display devices near the instrument panel where switches and display devices are concentrated, so problems may occur. It is difficult to install new command switches and display devices in conjunction with the addition of diagnostic equipment. In addition, the increase in the number of switches and display devices makes it difficult to operate the switches.
There are also problems that make the display difficult to read.

Therefore, it is conceivable to share the command switch and display device for the abnormality diagnosis device with the set switch and display device in the constant speed traveling device. However, if the set switch in the constant speed running system also functions as a command switch for the abnormality diagnosis device, the constant speed running system will also operate even though the set switch is operated to display the abnormality diagnosis results. This poses a safety problem.

[Purpose of the invention]

In view of these problems, it is an object of the present invention to determine whether or not the driver or service person operated the set switch with the clear intention of displaying the abnormality diagnosis result of the constant speed traveling device. Provided is an abnormality diagnosis device for a constant speed traveling device that is capable of displaying only the abnormality diagnosis result without activating the constant speed traveling device if a set switch is operated with a clear intention. It's about doing.

[Structure of the invention]

The first configuration of the present invention to achieve this purpose is as follows.
This will be explained using figures.

While the vehicle is running, if the vehicle speed when the set switch is operated is equal to or higher than a preset lower limit vehicle speed, that vehicle speed will be stored as the set vehicle speed, and from then on, the throttle valve opening will be adjusted via the actuator to maintain this vehicle speed. In a constant speed traveling device that has a power indicator that indicates that power is being supplied to the constant speed traveling device, an abnormality diagnosis means, a low speed detection means, a timer, an operation number detection means, and an abnormality diagnosis processing are provided. It is an abnormality diagnosis device equipped with means.

The abnormality diagnosis means diagnoses whether a failure has occurred in each part within the constant speed traveling device, such as a vehicle speed sensor or an actuator.

The low speed detection means detects, based on a signal from the vehicle speed sensor, that the vehicle speed is lower than a predetermined vehicle speed that is set lower than the lower limit vehicle speed at which constant speed driving control is performed, and the timer detects when the set switch is operated. It is activated when the timer starts, and then measures a predetermined time. Further, the operation number detecting means counts the number of operations of the set switch, and detects that the number of operations reaches a predetermined number within a predetermined time of the timer. In the abnormality diagnosis processing means, the low speed detection means detects that the vehicle speed is lower than a predetermined vehicle speed, and the operation number detection means detects that the number of operations of the set switch has reached a predetermined number. Then, a coded signal is supplied to the power indicator according to the diagnosis result of the abnormality diagnosis means.

As a result, when the set switch is operated a predetermined number of times within a predetermined time in a low vehicle speed state where constant speed driving control is not performed even if the set switch is operated, the diagnosis result of the abnormality diagnosis means is The power indicator of the device is displayed using a coded signal according to the diagnosis result, and is displayed separately from the normal power supply display.

〔Effect of the invention〕

According to the present invention, the set switch is shared as a command switch for outputting abnormality diagnosis results, and the power indicator is shared as a display device, so there is no need to install a new switch or display device to confirm abnormality diagnosis results. , it is possible to easily realize an abnormality diagnosis device. Moreover, as mentioned above, as a result of sharing switches and display devices,
There are fewer switches and display devices near the instrument panel,
Overall, switch operation and display device reading can be made easier.

Furthermore, whether or not the set switch was operated with the clear intention of displaying the results of abnormality diagnosis for the constant speed traveling device can be determined by checking a predetermined number of times within a predetermined time and at a low vehicle speed in which the constant speed traveling device does not operate. Since the abnormality diagnosis result is displayed based on whether or not the set switch has been operated, if the set switch is operated with the clear intention of displaying the abnormal diagnosis result, the constant speed running system will be activated. The system does not move, making it possible to diagnose abnormalities in constant speed traveling devices with high safety.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an electrical circuit diagram of one embodiment, and 10
is a control circuit of a constant speed traveling device including an abnormality diagnosis device,
21 is a set switch, 22 is a vehicle speed sensor, 30
is the actuator of the constant speed traveling device, 42 is the ignition switch, 43 is the main switch, 51
is a power indicator consisting of a light emitting diode.

The control circuit 10 includes a microcomputer 11
When there is, constant speed driving processing and abnormality diagnosis processing,
Everything is done by this microcomputer 11. On the way to the microcomputer 11,
A battery 4 provides power via an ignition switch 42, a fuse 44, and a main switch 43.
1 is connected. Of course, although not shown in the microcomputer 11, there is a constant voltage circuit that sets the voltage supplied from the battery 41 to a predetermined voltage, for example, a constant voltage of 5V, and controls the CPU, ROM, and It supplies RAM and other parts. The main switch 43 is a switch that is turned on when the constant speed traveling device is activated. A power indicator 51 is connected to the main switch 43, and the other end of the power indicator 51 is connected to the transistor 13 via a protective resistor 52. It is connected. Since the transistor 13 is conductive when the ignition switch 42 and the main switch 43 are turned on as described later, the power indicator 51 is energized and emits light, indicating that power is being supplied to the control circuit 10. Display.

A set switch 21 and a vehicle speed sensor 22 are connected to the microcomputer 11 via an I/O port (not shown). Similarly, a power indicator 5 is connected to the I/O port of the microcomputer 11 via transistors 12 and 13.
1 is connected, and an actuator 30 is connected via transistors 14 and 15 or transistors 16 and 17. The actuator 30 is
It is a well-known pneumatic actuator, 31 is a control coil, and 32 is a release coil. As is well known, when the control coil 31 is energized, a control valve (not shown) is energized to introduce negative pressure into the diaphragm chamber (not shown) of the actuator 30, and when the control coil 31 is de-energized, The control valve is de-energized and atmospheric pressure is introduced into the diaphragm chamber of the actuator 30.
Further, when the release coil 32 is energized, a release valve (not shown) is energized, a release port (not shown) that introduces atmospheric pressure into the diaphragm chamber of the actuator 30 is closed, and the current is de-energized. Then, the release port is opened by the release valve, and atmospheric pressure is introduced into the diaphragm chamber of the actuator 30. The diaphragm of the actuator is connected to a throttle valve (not shown), and the stronger the negative pressure in the diaphragm chamber, the greater the opening of the throttle valve; conversely, the weaker the negative pressure, the lower the atmospheric pressure. The closer it gets to , the smaller the throttle valve opening.

Figure 3 shows the ROM of the microcomputer 11.
(not shown) This is a flowchart showing an overview of the program contents stored in the computer (not shown), and this constant speed driving (A/D) control is a time interrupt processing routine that is activated every predetermined time, for example, every 100 milliseconds. It is.

In this A/D control routine, in step 100, a well-known constant speed running process is executed, and in step 200, an abnormality diagnosis process, which is a feature of the present invention, is executed.

When the constant speed driving process is executed in step 100, it is determined whether or not the set switch 21 has been operated. When the set switch 21 is once turned on and then turned off, the vehicle speed sensor 2
Set the vehicle speed detected by 2 as the set vehicle speed.
It is stored at a predetermined location in RAM (not shown). Thereafter, the actuator 3 is adjusted so that the vehicle speed detected by the vehicle speed sensor 22 matches the set vehicle speed.
The energization state of both coils 31 and 32 of 0 is controlled.
That is, at the time when the set switch 21 is turned on and off, the transistors 16 and 17 are
When conductive, the release coil 32 is energized and prevents atmospheric pressure from being introduced into the diaphragm chamber of the actuator 30 through the release port. Further, the transistors 14 and 15 are turned on for a specific time period appropriate to the set vehicle speed, and the control coil 31
Electricity is applied to introduce negative pressure into the diaphragm chamber of the actuator 30. Once a certain time has passed,
Transistors 14 and 15 are rendered non-conductive;
Since the control coil 31 is de-energized, atmospheric pressure is introduced into the diaphragm chamber of the actuator 30 instead of the previous negative pressure. Since the control coil 31 is energized and de-energized every 100 milliseconds when the A/D control processing routine is started, the specific time during which the control coil 31 is energized is 40 milliseconds.
If the energization time is milliseconds, the duty ratio of the control coil 31 will be controlled at a duty ratio of 40%, and if the energization time is 60 milliseconds, the duty ratio will be controlled at a duty ratio of 60%. The energization time of the control coil 31, that is, the duty ratio, is made higher when the vehicle speed detected by the vehicle speed sensor 22 is lower than the set vehicle speed; If the pressure is high, the pressure is lowered than before, so the diaphragm chamber is maintained at a negative pressure suitable for maintaining the vehicle speed at the set vehicle speed, and accordingly, the opening of the throttle valve is controlled via the diaphragm. Ru.

Although not shown, when a braking operation is performed on the vehicle or an operation is performed that cuts off the power transmission path from the engine to the wheels, the transistor 14
~17 are all no longer conductive, and the control coil 31
and the release coil 32 are both de-energized,
Inside the diaphragm 3 of the actuator 30,
Atmospheric pressure is rapidly introduced, closing the throttle valve. In other words, constant speed driving control is canceled.

Next, in step 200, an abnormality diagnosis process is performed. Here, when the vehicle speed is lower than a predetermined vehicle speed and the set switch 21 is operated a predetermined number of times within a predetermined time, a well-known abnormality diagnosis process is performed. be exposed. Note that even if the set switch 21 is operated in this manner, constant speed driving control is not performed because the vehicle speed is low. In other words, although omitted in the above explanation, there is an upper limit and a lower limit to the vehicle speed at which constant speed driving control is performed, and since the predetermined vehicle speed is set lower than the lower limit vehicle speed, constant speed driving control is not performed. .

The details of step 200 are shown in FIG. 4 and will be described below with reference to FIG.

First, in step 236, it is determined whether the diagnosis flag DNF, which stores the fact that an abnormality diagnosis has been performed, is set. Initially, the diagnosis flag DNF is reset to "0", so a negative determination is made in step 236 and the process proceeds to step 240. In step 240, the power indicator (Pi) 51
is turned on. In other words, transistors 12 and 13
is made conductive, and the power indicator 51 is energized. Therefore, the power indicator 51 is lit,
Displays that power is supplied to the constant speed traveling device. Next, in step 201, the vehicle speed V detected by the vehicle speed sensor 22 is a predetermined vehicle speed.
It is determined whether the speed is lower than 16 km/h.
If the vehicle speed V is not lower than 16 km/h, a negative determination is made in step 201, and the process proceeds to steps 238 and 237. In step 228, the set counter SC, which counts the number of times the set switch 21 is operated, is cleared. 0” and set switch 21.
The set switch flag SSF, which stores in the set state that the switch has been turned on, is reset to "0", and in step 237, the diagnosis flag SSF is reset to "0".
Reset DNF to "0".

If the vehicle speed decreases and becomes lower than 16 km/h, step 201 is determined to be affirmative.
Proceed to step 211, where the set counter SC
It is determined whether or not the value is "0". If the vehicle speed V is lower than 16 km/h and the set switch 21 has not been operated, the set counter SC is "0", so the step is not executed.
211 is affirmatively determined, and in step 212, the timer counter T is set to ``20''. This value "20" is a value corresponding to a time of 2 seconds. Because this routine has 100
It is activated every millisecond, so 100 milliseconds equals 20 times = 2 seconds.

After step 212 has been processed, the process advances to step 221, where it is determined whether or not the set switch 21 has been turned on. Now, when the set switch 21 is turned on, the process proceeds to step 221.
If the answer is affirmative, the process proceeds to step 223, where it is determined whether or not the set switch flag SSF is set. This is the first time I have turned on the set switch 21, and the set switch flag
If SSF is not set, a negative determination is made in step 223, and the process proceeds to step 224, where the set switch flag SSF is set. Then, in step 225, the set counter SC
is incremented, and in step 226,
It is determined whether the value of the set counter SC has reached "3" or more, which is a predetermined number of times. If the set counter SC has not reached ``3'' or more, a negative determination is made in step 226, and this abnormality diagnosis process ends.

In this way, when the set counter SC is changed from "0" to "1" by turning on the set switch 21, then step 211 is executed.
Since the determination is negative, the value of the timer counter T is decremented in step 213. In other words, "20" becomes "19". In step 214,
As a result, it is determined whether the value of the timer counter T has become "0". Since the value of the timer counter T has not reached "0" yet, step 214 is executed.
is determined to be negative, and the process proceeds to step 221. At this time, if the set switch 21 is still turned on, an affirmative determination is made in step 221, and the process proceeds to step 223. Since the set switch flag SSF has been set to "1" by the process of step 224, an affirmative determination is also made in step 223, and the abnormality diagnosis process ends.

After that, the timer counter T is decremented every 100 milliseconds in step 213.
The value of is reduced. However, before the value of the timer counter T reaches "0", the set switch 21
If the ON operation is canceled and the switch is turned OFF, a negative determination is made in step 221, so the process advances to step 222, where the set switch flag SSF is cleared.

Then, when the set switch 21 is turned on again, the subsequent step 221 is answered in the affirmative, so the process proceeds to step 223, where the set switch flag SSF has been set by the process of the previous step 222. Therefore, a negative determination is made in step 223 again, and steps 224 to 226 are performed. Therefore, the set switch flag SSF is set, and the set counter SC is incremented from "1" to "2".

In this way, if the set switch 21 is turned on for the third time before the value of the timer counter T reaches "0", an affirmative decision is made in step 226, so the set counter is turned on in step 227.
SC is cleared and returned to "0", and
In step 231, the diagnosis flag
Set DNF. Then, in step 232, it is checked whether any abnormality has occurred in each part of the constant speed traveling device, such as the actuator 30 or the vehicle speed sensor 22, and in step 233, a diagnosis output for displaying the check results is sent to the base of the transistor 12. give. This diagnosis output is coded according to the check result, and the power indicator 51 is turned on and off via transistors 12 and 13 to represent a predetermined code. After the diagnosis output has been performed in this manner, it is determined in step 234 whether the diagnosis output has been completed. If the diagnosis output has not been completed, a negative determination is made in step 234. At this time, the diagnosis flag
Since DNF has been set, the subsequent step 236 is answered in the affirmative, and the process proceeds to step 233.
This process is repeated until the diagnosis output is completed. Eventually, when the diagnosis output is completed, an affirmative judgment is made in step 234, so the process proceeds to steps 229 and 235 to set the set switch flag SSF and the diagnosis flag DNF.
is reset and everything is returned to its initial state. Then, since the determination in step 236 is negative again, the power indicator 51 is lit again in step 20, and the power indicator 51 is turned on again in step 20.
will now display power supply.

On the other hand, as described above, if the value of the timer counter T reaches "0" before the set switch 21 is turned on three times, the step
Since 214 is affirmatively determined, the process proceeds to steps 228 and 237, where the set counter SC is cleared, and the set switch flag SSF and diagnosis flag DNF are reset, and everything is returned to its initial state.

The diagnosis output in step 233 mentioned above is, for example, as shown in FIG.

In FIG. 5, A shows the lighting and turning off of the power indicator 51 based on the diagnosis output when there is no abnormality anywhere in the constant speed running device, and the lighting and turning off are repeated at 0.25 second intervals. This is done for 20 seconds. In addition, B in Fig. 5 shows the lighting and extinguishing states of the power indicator 51 based on the diagnosis output when a failure has occurred in two locations in the constant speed traveling device, and the content of one failure is 4. After turning off for a second, it lights up for 0.5 seconds,
It is displayed by turning off the light again for 1.5 seconds and then turning on for 0.5 seconds, and the other fault is displayed by turning off the light for 2.5 seconds after the display of the fault content of the other ends, and then turning on, off, and on again at 0.5 second intervals. It is displayed by turning off the light for 1.5 seconds, then turning off for 0.5 seconds.
In other words, if you pay attention only to the lighting state of the power indicator 51, the
The 1-1 code lights up individually, and the 2-1 code lights up twice and once at relatively long intervals.
1 code will be displayed. In addition, 3
You can also create various chords such as -1 chord and 3-2 chord. Therefore, if it is determined in advance which part and what kind of failure each code corresponds to as a convention, the details of the failure can be known from the code display by the power indicator 51. The display shown in FIG. 5B is repeated three times (only two times are shown in FIG. 5B).

Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. For example, the actuator may be an electric motor type instead of a pneumatic type. Further, the power indicator may be one using a lamp.

[Brief explanation of drawings]

FIG. 1 is a claim correspondence diagram, FIG. 2 is an electric circuit diagram of an embodiment of the present invention, FIG. 3 is a general flowchart showing an overview of the program contents of the microcomputer in FIG. 2, and FIG. This figure is a flowchart showing details of the abnormality diagnosis processing steps in FIG. 3, and FIG. 5 is a time chart for explaining the operation of the power indicator during abnormality diagnosis. DESCRIPTION OF SYMBOLS 10... Control circuit, 11... Microcomputer, 21... Set switch, 22... Vehicle speed sensor, 30... Actuator, 41... Battery, 42... Ignition switch, 43...
Main switch, 51...Power indicator.

Claims (1)

[Claims] 1. While the vehicle is running, if the vehicle speed when the set switch is operated is equal to or higher than a preset lower limit vehicle speed, that vehicle speed is stored as the set vehicle speed, and thereafter the actuator is operated to maintain this vehicle speed. A failure occurred in each part of the constant speed traveling device in a constant speed traveling device that controls the opening of the throttle valve through the constant speed traveling device and has a power indicator that indicates that power is being supplied to the constant speed traveling device. an abnormality diagnosis means for diagnosing whether or not the vehicle is running; a low speed detection means for detecting, based on a signal from a vehicle speed sensor, that the vehicle speed is lower than a predetermined vehicle speed set lower than the lower limit vehicle speed; and a set switch. is activated when the
Thereafter, a timer for counting a predetermined time; an operation count detection means for counting the number of operations of the set switch and detecting that the number of operations has reached a predetermined number within a predetermined time of the timer; and a low speed detection means. Therefore, when it is detected that the vehicle speed is lower than the predetermined vehicle speed, and the number of operations detecting means detects that the number of operations of the set switch has reached the predetermined number, the operation is performed according to the diagnosis result of the abnormality diagnosing means. An abnormality diagnosis device for a constant speed traveling device, comprising: abnormality diagnosis processing means for supplying a coded signal to a power indicator.