JPS6388422A - Trouble detector for vehicle - Google Patents

Abstract

PURPOSE:To facilitate the specification of a repair point while preventing erroneous replacement of accepted goods, by erasing the memory of abnormal condition when the same abnormal condition is not detected within a specified time. CONSTITUTION:When abnormal condition continuing over 0.1sec. occurs more than two times during three rounds of running, a trouble is recognized while a trouble with duplicating abnormal condition is recognized when single abnormal condition continues one second or more, a trouble indication is given on an on board trouble display 9 to notify an operator 5 to the effect and the abnormal condition is stored into a microcomputer 1. Only when the elimination of abnormal condition continues during three rounds of running, i.e. when the same abnormal condition continuing more than 0.1sec is not detected or the same abnormal condition continuing one sec. or more is not detected during three round of running more than two times during three rounds of running, the memory of the computer 1 is erased by an abnormal condition memory erasing means 11 by the control signal of the computer 1.

Description

[Detailed Description of the Invention] The present invention relates to a failure detection device for a vehicle, and more specifically, it detects an abnormal state of a computer unit, sensor, actuator, etc. The present invention relates to an improved vehicle failure detection device that displays information to the driver and has means for storing the status.

Hirooka Ibara survey computer unit, sensors, actuators, etc.
When an abnormal signal indicating an abnormal state of various devices in the vehicle is detected, a malfunction is assumed to have occurred only when the abnormal signal continues for a certain period of time, for example, one to several seconds, and the driver is notified that it is winter. A vehicle failure detection device is known that not only displays a warning signal on the vehicle but also stores the abnormality signal so that a service person can easily find the failure point during repair. (Japanese Unexamined Patent Application Publication No. 57-86544,) ■Review point to be solved: When an abnormal condition occurs in a vehicle, this device stores the abnormal condition in memory, allowing service personnel to identify the repair area. However, when abnormal signals occur infrequently, or when the abnormal signal duration is short and the reproducibility is poor, even if an abnormal signal occurs, it may not actually be possible. , no failure occurred,
Alternatively, there are many cases where the failure is not serious enough to require repair, and therefore, when a failure is detected by such a vehicle failure detection device, even if a serviceman attempts to repair the failure according to the memorized abnormal signal, It was extremely difficult to identify the true location of the failure, and it was not uncommon to incorrectly identify the failure location and replace non-faulty parts.

OBJECT OF THE INVENTION The present invention provides a vehicle that selectively stores only failures that require repair, makes it easy to identify parts to be repaired, and prevents erroneous replacement of non-defective parts. The object of the present invention is to provide a failure detection device.

This object of the present invention is achieved by providing means for erasing the memory of an abnormal condition when an abnormal condition identical to the stored abnormal condition is not detected within a predetermined period of time.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a conceptual diagram of an engine electronic control system including a vehicle failure detection device according to an embodiment of the present invention, and FIG. 2 is a drawing showing a failure display control logic program.

In FIG. 1, a control unit 2 including a microcomputer 1 receives analog signals detected by an intake air temperature sensor, throttle sensor, etc., digital signals from an idle switch, etc., and pulse signals from an airflow sensor, etc. The information is input to the microcomputer 1 via the input interface 3. 4 is an A/D converter which digitizes the analog signal and inputs it to the microcomputer 1. Various control signals calculated by the microcomputer 1 are output to the driver 5, and are sent to the fuel injection valve 6, solenoid pulp 7, fuel pump 8, on-board fault indicator 9, off-board fault indicator 10, and abnormal state memory. Erasing means 11 is configured to be driven by these control signals. The on-board fault indicator 9 is located near the installation panel in the vehicle interior (not shown).
Alternatively, it is a display provided near the control unit 2, which notifies the driver of the occurrence of a failure using a lamp or the like based on a control signal from the microcomputer 1. Additionally, the off-board fault indicator 10 typically
This device is carried by service personnel and is connected to the electronic control system of the engine installed in the vehicle through the connector 12 when inspecting or repairing the vehicle. The system is configured to display a failure based on the signal shown. The abnormal state memory erasing means 11 includes a timer means, and when the same fault is not detected for a predetermined period of time after a fault to be displayed on the on-board fault display 9 is detected, the abnormal state memory erasing means 11 erases the data stored in the microcomputer 1. It has a function to erase signals indicating abnormal conditions.

The failure detection device in this embodiment operates according to control logic as shown in FIG. Even if the microcomputer 1 detects an abnormal state, there are many cases where no malfunction has actually occurred or the malfunction is not serious enough to require repair, so it is not enough to notify the driver. It is not clear whether the abnormal condition requires repair, and therefore the abnormal condition is indicated so that the on-board fault indicator 9 indicates a fault and the off-board fault indicator 10 indicates a fault. There is no need to store it in the microcomputer 1; rather, at this point, displaying a fault on the on-board fault indicator 9 may result in the driver being distracted, and the off-board fault display may Memorizing the abnormal state so that a fault is displayed on the device 10 may cause a service person to misunderstand that a repair is necessary even though there is no fault to be repaired, or may misidentify the location of the fault, leading to a failure. This is undesirable as there is a risk of having to replace parts that are not compatible. In this embodiment, abnormal states that occur infrequently, abnormal states that have a short duration, are accidental, and have poor reproducibility are not notified to the driver and are not stored in the microcomputer 1. This prevents such problems from occurring. In other words, if an abnormal condition that lasts for 0.1 seconds or more occurs three or more times during the engine's three running cycles (until the engine is cut off three times), the abnormal condition is considered to be a frequently occurring abnormal condition and is considered to be a malfunction. In addition, if a single abnormal condition persists for more than 1 second, the abnormal condition is not an accidental condition, but is a reproducible abnormal condition, and is recognized as a failure. A malfunction is displayed on the display 9 to notify the driver, and the microcomputer 1 stores the abnormal state in its memory.

After that, when the abnormal condition is resolved, the on-board failure indicator 9 is controlled to stop displaying the failure at that point. However, at this point, the abnormal state memory erasing means 11 is not activated yet, and the memory in the microcomputer 1 is not erased, and if the abnormal state has continued for three runs, that is, 0. Only when the same abnormal condition that lasts for 1 second or more is not detected three times or more during three runs, or when the same abnormal condition that lasts for 1 second or more is not detected during three runs, The memory of the microcomputer 1 is controlled to be erased by the abnormal state memory erasing means 11. Even if an abnormal condition that can be recognized as a failure is detected, it is still not clear whether the failure requires repair or not, so this abnormal condition is stored in the microcomputer 1 as a failure, and repairs and inspections are carried out. Sometimes, when a failure is displayed on the off-board failure indicator 10, it is not preferable because it may mislead the service engineer's judgment. Only when the same failure is detected again within a predetermined period of time will it be determined that the failure requires repair, and for convenience when a service person performs the repair, the memory will be stored in the microcomputer 1 and the information will be stored in the microcomputer 1 for repair and inspection. In such cases, displaying a fault on the off-board fault indicator 10 makes it easier for service personnel to accurately identify the location of the fault. This is effective in preventing replacement of non-defective products due to misunderstanding.

The present invention is not limited to the above-mentioned examples, but various modifications can be made within the scope of the invention described in the claims, and these are also included within the scope of the present invention. Needless to say.

For example, in the embodiment described above, if an abnormal state that lasts for 0.1 seconds or more occurs three or more times during three runs, it is recognized as a failure as a frequently occurring abnormal state, and If the abnormal condition is <VEVE for more than 1 second,
Although it is recognized as a failure due to a reproducible abnormal condition,
In short, by identifying abnormal conditions that occur infrequently or with poor reproducibility as failures, and displaying or storing them,
It is sufficient to narrow down the range of failures to be displayed or memorized to the extent that can prevent unnecessary warnings to the driver or failure indications that may mislead service personnel. It goes without saying that failures may be identified as abnormal conditions that occur frequently or as abnormal conditions that are reproducible using the method.

Similarly, in the above embodiment, the memory of the microcomputer 1 is erased only when the abnormality-resolved state continues for three times. The memory may be erased based on something other than the number of times the vehicle was driven, and furthermore, it may be used as a reference for the elapsed time after the failure was recognized, regardless of the number of times the vehicle was driven.
It may also be configured to erase the memory if the abnormality-resolved state continues for a predetermined period of time.

According to the present invention, an abnormal state that occurs infrequently with a high possibility that it is not actually a malfunction, or an abnormal state that lasts for only a short time and has poor reproducibility is displayed as a malfunction, making it useless to the driver. This system prevents service personnel from misjudging the judgment and making unnecessary repairs by giving warnings and displaying abnormal conditions that do not require repair as failures, and provides accurate information about failures to drivers. As well as being able to give
When performing repairs or inspections, it becomes easier for a service person to accurately identify a failure location.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an engine electronic control system including a vehicle failure detection device according to an embodiment of the present invention, and FIG. 2 is a drawing showing a failure display control logic program. DESCRIPTION OF SYMBOLS 1... Microcomputer, 2... Control unit, 3... Input interface, 4... A/D converter, 5... Driver, 6... Fuel injection valve, 7... Solenoid - Valve, 8... Fuel pump, 9... On-board failure indicator, 10... Off-board failure indicator, 11... Abnormal state memory erasing means, 12... Connector.

Claims (1)

[Claims] In a vehicle failure detection device having means for detecting an abnormal state of a vehicle, means for displaying the abnormal state to a driver, and means for storing and displaying the abnormal state, the same abnormal state is not detected within a predetermined time. A vehicle failure detection device, sometimes comprising means for erasing the memory of the abnormal state.