JPS5996450A - Constant speed running device - Google Patents

Abstract

PURPOSE:To provide a constant speed running device for car with enhanced safety, by checking normality in operation of a constant car speed control device even in the stage of signal output from sensors, and by stopping the constant car speed control if any abnormality is sensed according to the schedule. CONSTITUTION:A constant car speed control device 1 consisting of a micro- computer reduces the speed one after another if any abnormality is judged to exist through the car speed data as car speed signal S5 during constant speed running. If an abnormality has occurred in the fuel adjustment control loop, it will be sensed by a failure sensing circuit 12, and the fuel amount is immediately set to zero to stop the car. If further an abnormality is found in the data given by the sensors 6, 7, 8 for water temp., fuel temp. and accelerator operating amount, respectively, it shall be judged according to the schedule whether the set constant speed running control is to be continued, and in case the control shall be interrupted, the car speed is decreased gradually to lead to standstill. According to this arrangement there is no risk of braking the car violently, to ensure that the safety is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant vehicle speed traveling device, and more specifically,
A constant vehicle speed system in which the constant vehicle speed control state is canceled if an abnormal condition occurs in the control system while the vehicle is traveling at a constant speed using an internal combustion engine as its drive source. Regarding traveling equipment.

In recent years, the running speed IW of a vehicle that is entirely driven by an internal combustion engine has been controlled to a desired constant speed IvK.
t is wide (it has come to be used. This kind of special purpose 1 contract ζ main, based on the data of each fIL indicating the operating condition of the engine, constant speed driving can be performed at f6' good driving condition IJη However, if the caster speed control is continued even though there is a small problem in the internal combustion engine running system or the 1st delivery system, etc. , there was a risk that the engine's fttll m+ would not be performed correctly and an accident such as engine seizure would occur.For this reason, medical personnel should check the full function of the sensor that detects the decline in the engine speed. From 4S-SK, a device has been proposed that cancels the constant speed running operation when the engine power decreases (Japanese Patent Application Laid-Open No. 56-69436).
. However, in this proposed system, a decline in the engine's function is detected by detecting an overheated train of the engine, and this releases the vehicle from running, so the speed of the caster is reduced. In some cases, the engine becomes narrow before Moe 1 is released, and since the engine function is already degraded, there is a possibility that the engine will suddenly decelerate at the same time as θ1 on the constant vehicle speed side is released. This poses a problem in that it is not possible to ensure sufficient safety.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems in the prior art and to provide a constant speed driving system with higher safety.

The configuration of the present invention is that a constant speed traveling device for an automobile includes means for monitoring the state of the system of the traveling device based on the output state of each sensor. The present invention is characterized in that the castor reverse running control state is canceled when an abnormal state is detected. The caster stray running control state can be canceled by gradually reducing the amount of fuel supplied to the engine until it is finally zero. Detection of an abnormality in the system state may be performed only when preset abnormal conditions are met. Therefore, even if a system abnormality is detected, under the predetermined condition, the constant speed side M+I
It may be configured to continue i.

Checking the system status includes checking for failures of each sensor, and in this respect,
Further improvements in safety can be expected.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a block diagram of an embodiment of a constant vehicle speed traveling device according to the present invention. Constant speed running device #1 includes an actuator 3 connected to a speed regulating member (not shown) of an internal combustion FN related device 2 used as a drive source of the vehicle, and controls various operating states of the internal combustion engine device 2. The actuator 3 is actuated based on the data indicating the vehicle speed of the vehicle driven by the internal combustion engine device 2, and the vehicle speed reaches the desired speed f.
The position of the speed regulating member is controlled so that the speed is maintained at i#. The internal combustion engine device 2 can be constituted by a gasoline engine or a diesel engine, and the actuator 3 is connected (3) to a fuel regulating member of the internal combustion engine.

The positioning state of the first speed member by the actuator 3 is calculated in a central processing unit J (CPU) 5 according to a predetermined control program stored in the memory 4.
It is determined. The above-mentioned control calculations are performed based on detection signals from each sensor that detects each operating state of the internal combustion engine device 2. In the illustrated embodiment, the water temperature signal S indicates the cooling water flow.

Water temperature sensor 6 outputs full output, fuel temperature signal Ss indicating fuel temperature
The fuel temperature sensor 7 outputs the accelerator pedal operation phase (
An accelerator sensor 8 that outputs an accelerator signal 84k indicating the amount of depression), a vehicle speed sensor 9 that outputs a vehicle speed signal S'sk indicating the speed of the vehicle, and a rotation sensor 84 that outputs a speed signal S6 indicating the rotational speed of the internal combustion engine. are provided, and the output signals from these sensors are input to the input/output device ('10) 1.
1, the data is converted into digital data and input to the central processing unit 5.

The constant vehicle speed traveling device fl further includes a failure detection circuit 12i for detecting a failure in the control system for regulating fuel (4). This failure detection circuit 12 is a circuit that outputs a failure signal 8yk when a failure or the like occurs in the closed-loop control system for fuel adjustment and a condition in which the target cutoff value and the actual control value do not match continues for a predetermined period of time. This failure signal S7 is also transmitted to the input/output device t.
It is input to central processing unit #5 via tl.

Reference numeral 13 designates a control signal generator for outputting various control signals for setting and releasing the constant speed running side, and various operation switches 4 (not shown).
It is composed of: The constant vehicle speed running control executed based on the control signal from the control signal generator 13 and the signals from each sensor is basically the same as the conventional one, so the details are omitted.

Next, a control program that detects any abnormalities in the system and cancels the constant vehicle speed running control M1 will be described in detail.

FIG. 2 shows a flowchart of a constant vehicle speed running control program that can detect any abnormal state that occurs in the control system shown in FIG. 1 and completely cancel the constant vehicle speed running control. It is shown. When the program starts, first, in step a, water-wetting data based on the water-wetting signal S2 is read, and in step b, it is determined whether the value is within a predetermined range. If the water wetness value indicated by the water wetness data is outside the predetermined normal range, the water wetness data end will be displayed at an abnormal IFj (step C). After that, the fuel temperature signal S will be The fuel temperature data based on the fuel temperature data is read (step d). If the water-wet data value is within the normal range, no water-wet abnormality is displayed (proceed to step d).

The fuel salinity fit indicated by the fuel temperature data read in step d is also determined as to whether it is within a predetermined range (step e), and the value of the fuel temperature indicated by the fuel temperature data is determined. If the fuel data is outside a predetermined normal range, it is displayed that the fuel data is an abnormal value (step f), and then the accelerator data is read based on the accelerator signal S4 (step g). Fuel temperature data I
If K is within the normal range, the process proceeds to step g without displaying any fuel temperature abnormalities.

Regarding the accelerator data read in step g, it is also determined in step h whether or not it is within a predetermined normal range, and the value of the accelerator data indicating accelerator operation f' is within a predetermined normal range. If so, in step i, the target @Q of the fuel supply amount according to the accelerator operation amount
The computation of drIve is performed. If it is determined in step h that the value of the accelerator data is abnormal,
Do not calculate the target direct drive Qdrive, display a fault, and set Qdrive = O to step j.
), proceed to the next step k.

In the Stella 7', vehicle speed data obtained based on the vehicle speed signal S is read, and it is determined whether the head of the vehicle speed indicated by the read data is within a predetermined normal range ( Step 1). If it is determined in step 1 that the value of the vehicle speed data is abnormal, an abnormality display is performed (step (7), step m), and the process proceeds to step 11/[n]. Here, the abnormality display executed in steps c, f, j, and m is
7 is also carried out by lighting up the abnormality indicator lamp +4 (see Fig. 1). If the value of the vehicle speed data is within a predetermined normal range, it is further determined in step 0 whether or not the vehicle is in the constant vehicle speed traveling side [phase]. Only if it is determined, it is determined in step I) whether or not there is an abnormality within the control system.

The abnormality determination in step p is performed in step b.

This is performed based on the determination results made in steps e and h, for example, in each step b and e.

A YES result may be issued in step p only when all the determination results of h are abnormal, or a YES result may be issued in step p if at least one step has an abnormal determination result. It may be possible to output a YES result.

That is, in step p, the results of determining whether each data other than the vehicle speed data is abnormal or normal are evaluated, and the final determination of whether the system is abnormal or normal is made in accordance with a predetermined evaluation standard.

Therefore, if it is determined that there is an abnormality in the system for some reason, in step n, the constant speed traveling side #J
In order to perform this, the value of Qcruise, which indicates the amount of fuel supplied at any given time, is reduced by a predetermined value, and a cruise lamp (not shown) is installed to indicate that the vehicle is traveling at a constant speed.
Turn off the light (step q).

The subtraction of the value of Q cruise in step m is performed in each subsequent program cycle, resulting in a gradual decrease in vehicle speed. On the other hand, if it is determined that the system is operating normally, Qcru
Without decreasing the value of ise , data processing f Q cruise is performed to perform PI control, and the cruise lamp is turned on (steps r, s).

Step 1: Q cruise and Qdrive
A comparison is made with e, and the larger value is set as Q (steps U and V). In step W, it is determined whether or not a failure has occurred in the fuel adjustment system based on the failure signal S output from the failure detection circuit 12, and the Assume that the value of Q is all zero (step X), and if no failure has occurred, output M of Q obtained in step U or V as is (
step y).

The value of Q is inputted to the drive & IJ circuit 15 via the input/output circuit tti as position control data D indicating the target position of the fuel adjustment member (see Fig. 1). l is carried out.

According to this configuration, in response to an abnormality in the vehicle speed control system, (a) If an abnormality occurs in the vehicle speed data while the vehicle is traveling at a constant speed, the vehicle speed is sequentially reduced.

(b) If an abnormality occurs in the fuel temperature control loop, the value of Q is immediately set to zero, thereby immediately stopping the vehicle.

(c) If an abnormality occurs in each data indicating water temperature, fuel temperature, or accelerator operation amount,
It is determined whether or not to continue the constant vehicle speed running control (step p), and when the constant vehicle speed running control is completely interrupted, (a)
Similarly to JJS Yin, the vehicle speed is gradually reduced to a complete stop and the vehicle is finally stopped.

As shown in FIG. 2, system abnormalities can be checked from the sensor output signal stage, and appropriate countermeasures can be taken depending on the nature of the abnormality. Therefore, in addition to significantly improving safety, the constant vehicle speed control operation is limited at all stages depending on the severity of the obstacle, so unlike simply stopping the vehicle, the vehicle suddenly decelerates. This has the advantage of reducing the risk of being rear-ended by a following vehicle, and providing a good feeling to the driver.

FIG. 3 shows the change in vehicle speed V with respect to time tK when constant speed running is canceled. Time t.

Previously, constant vehicle speed running control was performed, so the vehicle speed V was maintained at a desired speed as shown in the figure. Time 1. If an abnormality occurs in the data value indicating the accelerator operation amount, the constant vehicle speed running control is canceled and the vehicle speed V gradually decreases at a predetermined rate as shown by the solid line until time t.

At (11), the vehicle speed becomes zero (the engine stops). Furthermore, if an abnormality occurs in the data value indicating water wetness #i at time t, for example, the constant vehicle speed running control is canceled and the vehicle speed V gradually decreases at a predetermined rate (indicated by a solid line). but,
At time t3, Q cruise (Qdri
ve, the vehicle speed can be controlled according to the amount of depression of the accelerator pedal, as shown by the dotted line. Furthermore, the third
The figure shows a case where the amount of depression of the accelerator pedal is held constant.

Although the intake air temperature sensor is omitted in the above embodiment, the present invention is not limited to the device in which only each sensor shown in FIG. It can be similarly applied to constant vehicle speed control devices using sensors, and the types of internal combustion engines are
It can be a gasoline engine, diesel engine or other internal combustion engine.

According to the present invention, as described above, whether or not an abnormality has occurred in the constant vehicle speed control device is also checked at the stage of the output signals of various sensors, and when a predetermined abnormal state is detected, the 11 (12) While the vehicle is running at a constant speed, the 11 (12) condition is canceled, so that if a malfunction occurs in the internal combustion engine, etc., the state can be completely canceled before the engine function deteriorates. Therefore, there is extremely little risk of inconveniences such as the vehicle speed rapidly decreasing and falling into a sudden deceleration state, similar to when the constant vehicle speed traveling control is canceled, thereby providing a constant vehicle speed traveling device that is extremely safe. can do.

[Brief explanation of the drawing]

FIG. 2 is a flowchart of the control program for the constant speed traveling device shown in FIG. 1, and FIG. Based on the program (t4ill @ @, the vehicle speed characteristics when the system is abnormal)
It is a graph showing k. 1. Constant vehicle speed running device, 2. Internal combustion engine device, 3.
... Actuator, 6... Water temperature sensor, 7... Fuel temperature sensor, 8... Accelerator sensor, 9... Vehicle speed sensor, 10... Rotation sensor, +1... Input/output device, 12
... Failure detection circuit s2 ... Water temperature signal, S3 ... Fuel temperature signal, S4 ... Accelerator 4N, S, ... Vehicle speed signal, S, ... Speed signal. -321- > 0 Procedural amendment (voluntary) November 22, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 57-205559 2. Name of the invention Constant vehicle speed running device 3. Amendment Relationship with the case involving the person who filed the patent application Patent applicant address 3-6-7 Shibuya, Shibuya-ku, Tobu East Name (3
33) Diesel Kiki Co., Ltd. Representative: Mochizuki-Sei 4, Agent address: 105 Higashido Minato-ku, Shiba 3-4-16, Figure 1 of the 2nd floor plan of Tomowa Building. 6. Contents of correction Figure 1 of the drawings will be corrected as shown in the attached sheet. -5 (5・岨; offing)

Claims (1)

[Scope of Claims]] In a constant speed running device for an automobile, means for monitoring the state of the system of the constant speed running device based on the output state of each sensor, and a means for monitoring the state of the system of the constant speed running device based on the state of the output of each sensor, and a means for monitoring the system state by the means, which may cause abnormal noise in the system. 1. A constant vehicle speed traveling device comprising: means for canceling a constant vehicle speed traveling control state when an abnormal condition is detected. 2. The constant speed vehicle traveling device for a top thief as claimed in claim 1, characterized in that said releasing means causes the vehicle to stop by completely gradually decelerating the vehicle speed.