JPH0341376B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a failure display device for a vehicle control device. In recent years, microcomputers have been used in control systems for various vehicle devices, and as these control systems have become more complex, fault display devices that indicate failures in various sensors, control elements, etc. within the control system have become increasingly important. Various methods have been proposed in the past. This type of conventional device detects the occurrence of an abnormality by setting voltage codes in advance for each diagnostic item, each of which is configured to sequentially display different voltage values each having a predetermined duration. A device that sequentially outputs voltage code signals corresponding to each diagnostic item from a single output line (Japanese Patent Laid-Open No. 57-31004), or a device that repeatedly displays two or more types of intermittent counts. The display device has an indicator that indicates an abnormal location, and the indication of an abnormal location by the intermittent repeated display of this indicator is made only by a combination of each intermittent number, regardless of the order in which the display occurs. A device (Japanese Unexamined Patent Publication No. 117007/1983) has been proposed.
However, all of these proposed devices recognize the content of the fault using a voltage code or blinking pattern, and because reading is complicated, they are prone to errors and are difficult to handle. Therefore, the object of the present invention is to enable anyone to easily understand the content of the fault without using complicated and difficult-to-remember codes, and to provide an extremely economical system that requires only a display device with a simple mechanism. An object of the present invention is to provide a failure display device for a vehicle control device. The configuration of the present invention includes a means for checking whether each of a plurality of predetermined diagnostic items is normal or abnormal and outputting data indicating the results, a means for storing the data, and at least one of the above diagnostic items. a single optical display means capable of obtaining a plurality of different optical display states, and when at least one of the above diagnostic items is determined to be abnormal; The optical display means is controlled in a predetermined blinking drive pattern to distinguish between an abnormal display and a normal display. The present invention is characterized in that it includes a display control means for sequentially displaying images in a predetermined order using an optical display means. Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. FIG. 1 shows an embodiment of an electronically controlled fuel injection system with a fault indicator according to the invention. The electronically controlled fuel injection device 1 includes a distribution type fuel injection pump 3 for injecting and supplying fuel to a diesel engine 2, and a control unit 4.
The distribution type fuel injection pump 3 includes a plunger barrel 2
The plunger 5 is driven by the diesel engine 2 in the plunger barrel 21 due to the driving disk 6 which is driven by the diesel engine 2 and the cam disk 7 which is in contact with the driving disk 6. It is configured to perform rotational reciprocating motion in accordance with the rotation of.
Due to the rotational reciprocating motion of the plunger 5, fuel pressurized within the plunger barrel 21 is supplied to the diesel engine 2 via the delivery valve 22. In addition, in FIG. 1, the delivery valve 22 is 1
Although only one is shown, the number of delivery valves is the same as the number of cylinders of the diesel engine 2, and fuel is injected and supplied to each cylinder of the diesel engine 2 from these delivery valves. There is. A control sleeve 8 is attached to the plunger 5, and the position of the control sleeve 8 can be adjusted by an actuator 9 connected to the control sleeve 8, thereby adjusting the injection amount. ing. In order to control the actuator 9 based on the current operating conditions of the diesel engine 2 and to control the speed of the diesel engine 2 in accordance with the required speed regulating characteristics, the actuator 9 responds to data indicating various operating conditions of the diesel engine 2. A control unit 4 is provided which operates as follows. In order to obtain data indicating the operating conditions of the diesel engine 2, in this embodiment, the diesel engine 2 operates in response to a timing pulse P from a timing pulse generator 11 attached to the crankshaft 10 of the diesel engine 2. Speed signal indicating rotation speed
Speed detector 12 that outputs S ₁ , accelerator pedal 1
An accelerator detector 14 outputs an accelerator signal S ₂ indicating the amount of depression of the diesel engine 2, and a water temperature detector 15 outputs a water temperature signal S ₃ indicating the temperature of the cooling water of the diesel engine 2. The speed signal S ₁ , the accelerator signal S ₂ , and the water temperature signal S ₃ are input to the interface circuit 16 and converted into digital data, respectively, to provide data indicating the operating conditions of the diesel engine 2 at any given time.
The signals are input to the control unit 4 as D ₁ , D ₂ , and D ₃ . Control unit 4 is microcomputer 1
7, and the microcomputer 17 calculates the required information stored in advance in the microcomputer 17 from the current operating conditions of the diesel engine 2 determined according to the input data D ₁ , D ₂ , D ₃ . A target injection amount suitable for the current operating conditions is calculated with reference to data regarding the speed control characteristics. This target injection amount is further converted into target position data indicating the target sleeve position required to obtain the target injection amount based on data indicating the relationship between the position of the control sleeve 8 and the current injection amount. be done. The control sleeve 8 is provided with a position signal indicating the actual position of the control sleeve 8 at any given time.
A position sensor 18 for outputting the signal S ₄ is connected, and the position signal S ₄ is also converted by the interface circuit 16 into corresponding digital data D ₄ .
Data _D4 is input to the control unit 4.
The control unit 4 outputs a control signal _S5 necessary for positioning the control sleeve 8 at the position indicated by the target position data according to the difference between the target position data and the data _D4 , and outputs the control signal S5.
_S5 is amplified by the drive circuit 18 and applied to the actuator 9 as a drive signal _S6 . Therefore, the position of the control sleeve 8 is controlled in a closed loop according to the engine operating conditions at the time, and the speed of the diesel engine is electronically controlled in accordance with the required speed regulating characteristics. In FIG. 1, the reference numeral 19 indicates a battery, the - terminal 19a of the battery 19 is grounded, and the + terminal 1
9b is connected to the control unit 4. The control unit 4 is equipped with a function to detect and display the presence or absence of a fault in each part of the control system, and performs control calculations for detecting and displaying faults and the above-mentioned injection amount control. The calculation is executed by the microcomputer 17 provided in the control unit 4, and the presence or absence of a fault and its contents are displayed by turning on and off a lamp 20, which is an optical display means, as described below. This is how it is done. FIG. 2 shows a flowchart of an example of a program executed by the microcomputer 17. When the program starts,
After initialization is performed in step a, a predetermined first
A check is made as to whether the diagnostic items are normal or abnormal (step b). If the result of checking the first diagnostic item is determined to be abnormal, a predetermined process ₁₁ is performed in step c, and a flag indicating that the check result of the first diagnostic item is abnormal is carried out.
F ₁ is set up. If the determination result in step b is normal, process ₂₁ is executed (step d). At step d, the flag _F1 is reset, and after step c or d is executed in this way, the second, third, etc. diagnostic items are checked one after another, and processing is performed according to the respective results. Finally, the presence or absence of a failure in the nth diagnostic item is checked (step e), and processing is performed in accordance with the determination result (step f or step g). The diagnostic items in this embodiment are the following six predetermined items.

【table】

[Table] When an abnormality is detected in each of these diagnostic items, only the corresponding flag among the flags _F1 to _F6 is set. Based on the states of these flags F ₁ to F ₆ ,
It is determined whether or not there is a failure (step h), and if even one of these flags is set, the process proceeds to step i. On the other hand, if no failure is detected in all the diagnostic items, the lamp 20 is turned off in step n, and then the main control program for controlling the injection amount is executed (step j).
A control signal _S5 is output. If the determination result in step h is YES, a check is made in step i to see if the lamp 20 for failure indication is displayed, and if the lamp 20 is not displayed, the diagnosis result is determined based on the above-mentioned flag. An indication is made (step k), and if the lamp 20 is on display, the process proceeds to step 1, where a check is made to see if there is a serious fault or failure that requires the engine to stop operating.
In this embodiment, if there is an abnormality in at least one of the first, fifth, and sixth diagnostic items, it is determined that a serious failure has occurred, and engine control is stopped (step m). On the other hand, if the second, third, and fourth diagnostic items are abnormal, the control is not stopped, the main control program is executed, and the engine continues to operate. Next, failure display control by the control unit 4 will be explained. As described above, the diagnosis results of the first to sixth diagnosis items are configured to be notified to the operator by flashing the lamp 20, but this lamp 20 indicates that at least one of the above diagnostic items is a failure. It is used only when the determination result in step h is YES, and when all of the above diagnostic items are normal, the lamp 20 remains off. If the determination result in step h is YES, the lamp 20 will sequentially display whether each diagnostic item is normal or abnormal. This display form is shown in FIG. lamp 20
The display starts after a predetermined light-off period T ₀ has elapsed, and time slots T ₁ , T ₂ ,...T ₆ of time length T _a are given to the first to seventh diagnostic items, respectively. There is. Between each time slot _T1 to _T6 , a light-off period of a predetermined length _Tb is provided,
Moreover, this time length T _b is set to a length different from the length of the period T ₀ so that it can be distinguished from the period T ₀ when the lights are turned off. Ramp 2 at each time slot T ₁ to T ₆
The lighting state of 0 is determined by the states of flags _F1 to _F6 , and for diagnostic items for which a malfunction has been detected by the flags, for example, as shown by the dotted line at time slot _T1 , a short The light flashes repeatedly at regular intervals. On the other hand, in the time slot corresponding to the diagnostic item determined to be normal as a result of the diagnosis, the lamp 20 is continuously lit. This series of display operations is repeated in the manner shown in FIG. 5 until there are no abnormalities. Note that the mode of blinking of the lamp 20 corresponding to normality and abnormality is not limited to the above embodiment, and may be determined in other modes. Therefore, after the predetermined extinguishing period T ₀ has elapsed, the operator can monitor the lighting status of the lamp 20 a series of six times, and know how many times the display flashing in short cycles has occurred. , it is possible to know which of the six predetermined diagnostic items a failure has occurred. In this way, the location of the failure and the fact of the failure are displayed using a single lamp without using complicated patterns, so anyone can easily identify the location of the failure as long as they know the order in which to check the diagnostic items. can be checked. If any of the diagnostic items is determined to be normal, the lamp 20 does not light up at all and remains off, but a failure check is always performed. Therefore, as soon as the power is turned on,
If the entire control device is in a transient operating state and there is no failure, but the signals of each part are not within a predetermined level range, a lamp will indicate the failure. However, once the steady state is reached,
Each part becomes a normal state one after another, the failure display state changes to a normal display state one after another, and when the display for all diagnostic items becomes a normal display state, the lamp 20 settles into an off state. Furthermore, as can be seen from the flowchart in FIG. 2, if the lamp 20 is displaying and the control is not in a stopped state, the display routine will wait while the lamp is displaying. figure,
Since main control is performed during the standby time, the current fault location can be checked while controlling the engine. In the above embodiment, a case has been described in which the failure display device of the present invention is applied to an electronically controlled fuel injection device for a diesel engine. However, the present invention is not limited to the above embodiment. The same can be applied to failure indications of vehicle control devices. According to the present invention, as described above, only one optical display member such as a lamp, a light emitting diode, or an LCD is used to indicate whether the diagnosis result of a predetermined diagnosis item is normal or not.
Since it is configured to display abnormalities in a predetermined order and in a predetermined simple on/off pattern, anyone can easily understand the displayed contents, and it is economical and easy to use. be effective.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an electronically controlled fuel injection pump equipped with a failure display device according to the present invention, and FIG. FIG. 3 is a flowchart showing the program and is an explanatory diagram showing the pattern of failure display. DESCRIPTION OF SYMBOLS 1... Electronically controlled fuel injection device, 2... Diesel engine, 4... Control unit, 12... Speed detector, 14... Accelerator detector, 15... Water temperature detector, 17... Microcomputer, 19 ……
Batsuteri, 20...Lamp.

Claims (1)

[Claims] 1. Means for determining whether each of a plurality of predetermined diagnostic items is normal or abnormal and outputting data indicating the result, a means for storing the data, and a means for determining whether an abnormality is detected in at least one of the diagnostic items. a single optical display means capable of obtaining a plurality of different optical display states; and at least one of the diagnostic items.
When the item is determined to be abnormal, the optical display means is controlled in a predetermined blinking drive pattern to distinguish between abnormal display and normal display, and the diagnosis item is determined based on the data. 1. A failure display device for a vehicle control device, comprising display control means for sequentially displaying normal and abnormal conditions in a predetermined order by the optical display means.