JPH07209034A - Anti-hydroplaning device for automobile - Google Patents

Abstract

PURPOSE: To optimize the application of a suppressing and removing means by not only evaluating the rotation speed of wheels but also detecting the vibration of the traveling device and the vehicle body, the ambient temperature, and the wheel curvature in electronic manner and combining obtained data. CONSTITUTION: Sensors 8-10 for wheel rotation speed detection are attached to respective wheels, an acoustic type sensor 4 to detect the vibration of a traveling apparatus to a front-wheel-drive axle, and an acoustic type sensor 6 to detect the vibration of the vehicle body to a water spraying point. A thermometer 11 is further attached to a range in the front side bumper and an optical sensor 12 to detect the wheel curvature of tires is attached to the contact face of a tire. The detection data is sent to CPU 1 and compared with a memorized characteristic curve and in the case the data exceed threshold value, the suppressing and removing means is automatically driven. That is, the jet current is jetted out to divide 13 the water layer, mechanically thrust 17 the water layer away, stop a power steering ring 15, and throttle the supply of a fuel to an engine to prevent danger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to a lack of road contact (slip), such as the lifting of a car tire on the water surface.
The present invention relates to an automobile anti-hydroplaning device for electronically detecting a hydroplaning action on a road.

[0002]

2. Description of the Related Art So-called anti-slip control devices ASR are already known (cf. DE-A 37 40 433). This device detects the road surface holding property of the tire according to the road surface condition, and depending on this, determines the slip threshold value in each case.

A device for removing hydroplaning caused by pools of roads, for example for splitting a water film by means of a gas jet reaching in front of a tire, is disclosed in DE-A 26 07 07.
87 A1 and 3417048 A1. In this case, in particular, the device operates with a jet of compressed air.

Japanese Patent Abstracts of Japanese Examined Patent Publication No. 1-226403, Section M, 1989, Vol. 13, 552
From (M-903), there is known a device for improving the road surface holding property of a tire. In the case of this device, a friction-increasing medium for good road retention of the tire is emitted in front of the wheels of the vehicle in a time-controlled manner by a computer, and a sensor for detecting the wheel revolutions. And other sensors (eg speed sensor, braking sensor, engine speed sensor) and electronic signals for analyzing and evaluating the signals supplied from the individual sensors to the evaluation device of the computer and processed there. The slip is recognized by intelligently combining the sensor signals using various means.

Recent automobiles, especially passenger cars, are equipped with the following equipment. That is, a computer, a mounted electronic device having a unique power supply unit, a hydraulic device and its control means
Especially, electronic device control means, anti-lock device, anti-slip control device. The anti-lock device and the anti-slip control device are provided with at least one, especially a plurality of sensors for detecting the wheel rotation speed.

At least one temperature sensor for detecting the ambient temperature is incorporated for engine / fuel control or for air conditioning in the passenger compartment. Furthermore, the device on which the invention is based comprises known devices for directing a jet in front of the wheels of a vehicle.

[0007]

The problem underlying the present invention is to reduce the risk of general accidents and to reliably detect the aforementioned hydroplaning in an intelligent manner, in particular by means of electronic detection means. It is an object of the present invention to provide an anti-hydroplaning device which can be recognized as described above and can take measures to suppress and remove it.

[0008]

In order to solve this problem, a medium for obtaining a good road surface holding property of a tire is temporally controlled by a computer and is discharged from the front side of a wheel of a vehicle. To mechanically displace the water layer and form a jet of medium, which is composed of gas, liquid, particles or a mixture of at least two of these, to analyze and evaluate the processed signals fed from the individual sensors to the computer evaluation device. The vehicle's anti-hydroplaning device, especially for improving the road retention of tires despite road pools, is equipped with
In order to detect hydroplaning, a temperature sensor for detecting the ambient temperature of the vehicle, a sensor for detecting the vibration state of the traveling device, a vibration of at least a part of the vehicle body susceptible to water sprayed from the road It is characterized by intelligently combining (connecting) the signals of the sensor for detecting the state and the sensor for detecting the rotational speed of the wheel to detect slip of the wheel.

Claims 2-9, the description of the embodiments and the figures showing the embodiments describe other features of the present invention. Mutual combinations of these features and variants of the embodiments are also included in the invention.

The important effects of the present invention are as follows. In the case of the anti-lock device ABS and the anti-slip control device up to now, only the wheel rotational speed was evaluated as the main signal. However, the present invention combines various sensor values, and the danger of hydroplaning, that is, the tire from the water surface Is uniquely recognized whether there is a rise of
Take appropriate measures to alert or split the water layer.

The road vehicle according to the present invention comprises a device for measuring the vibration state of the traveling device. At that time, an acoustic sensor, in particular, an acoustic sensor attached to the shaft (front axle) is advantageous. For example, the difference between the vibration state on a dry road and the vibration state at the time of hydroplaning can be promptly detected through a frequency analysis device. To detect.

Furthermore, the road vehicle of the present invention is provided with an acoustic sensor for detecting the vibration state of the vehicle body, and this detects the spray of water from a wet road surface. Wheel slippage when the road surface is wet is detected via a vehicle wheel speed sensor. This allows a dangerous situation to be quickly detected, especially when braking is applied during hydroplaning. This is because in this running state, a small coefficient of friction immediately reduces the rotational speed of the floating wheel. When accelerating, the reverse slip is a measure of the danger. When the vehicle is stopped, hydroplaning is likewise detected by slip. Because
This is because the floating wheels are also braked.

The curvature of a floating tire changes in a typical manner at the contact surface with the road surface. This also
The occurrence of hydroplaning can be detected.
The temperature sensor distinguishes it from the icy surface. This temperature sensor measures the temperature around the vehicle and thereby reliably recognizes whether hydroplaning can occur. This is because this hydroplaning does not occur below a certain temperature (for example, 0 ° C.).

The measure according to the invention does not, at least in the first place, provide protection in the case of slippery, frozen road surfaces. The present inventor has proposed other means and measures for this frozen road surface.

The occurrence of hydroplaning is detected by combining the measured values detected by the sensor with a vehicle-mounted computer and evaluating them by comparison with a memory vibration curve. In that case, at least claim 1
The measurement information of the described sensors can be used. Furthermore, it is advantageous to use other measurement information. A warning signal can be issued by the computer output signal "Hydroplaning in progress" being "yes" or "no" or by the output signal "being within a predetermined threshold", and the following countermeasures can be taken. Can be taken. A jet of gas, liquid or particles destroys the water layer in front of the tire. By stopping the power steering / servo steering, dangerous steering is fully avoided. -By narrowing the fuel supply, moderate vehicle deceleration and thus risk factors are reduced. -Mechanical devices push away the water layer.

It is also meaningful to carry out the above different countermeasures at the same time.

[0017]

The present invention will be described in detail with reference to the drawings. As you can see from Figure 1, which is a view of the car from below,
In order to detect wheel slip, each wheel is provided with at least one wheel speed sensor 8-10 for detecting the number of rotations per minute. This electronic detection is
In order to remove or at least divide the water layer 3 in front of the wheels which causes the hydroplaning action, it is carried out by the computer 1 on the basis of the characteristic curve range 2 shown in FIG.

An acoustic sensor 4 is attached to the computer 1 as part of the antihydroplaning device, together with a device for analyzing the signals of this sensor, in order to detect the vibration state of the traveling device.

The means for detecting the vibration state of the vehicle body is likewise an acoustic sensor 6, for example a piezoelectric element such as a quartz resonator. This sensor is connected to a device 7 for analyzing the signal of the sensor 6 in order to detect a spray of water. 8, 9 and 10 are rotation speed sensors,
Reference numeral 11 is a temperature sensor. This temperature sensor is incorporated, for example, in the area of the front bumper. A sensor 12 is provided to detect the wheel curvature of the contact surface of the tire. This sensor may be an optical sensor, for example a laser sensor, a radar measuring device or an ultrasonic measuring device.

The measured values are guided from the sensor to its signal processing device. The signal processing device itself is connected to a computer. In this computer, analysis, for example frequency analysis, amplitude analysis or phase analysis etc. can be carried out and compared, as is known, with characteristic curves stored in the memory of the computer and shown in FIG. Based on the evaluation in the characteristic curve range 2 such as yes /
No report can be made. In FIG. 3, the hydroplaning range is clearly indicated by the threshold value. The vibration frequency and vibration of the vehicle body are entered on the Y axis, the vibration of the traveling device is entered on the X axis, and the temperature is entered on the Z axis.

After evaluating and outputting the signal, at 3 a given medium acts on the hydroplaning water layer. Only when the excitation vibration is in the range shown in FIG. 3 (hydroplaning range), the water spray will excite the acoustic sensor of the vehicle body. This hydroplaning range can be determined by calculation or by experience.

On the X axis, the vibration of the traveling device caused by the floating of the wheels (hydroplaning phenomenon) is detected by another acoustic sensor. This vibration causes the shaft to vibrate, and acts on the sensor 4 (see FIG. 1) provided at the center of the shaft.

The measured value entered on the Z-axis in the characteristic curve range of FIG. 3 is detected by the temperature sensor and is analyzed or evaluated by the computer 1 only when the temperature is within the following range. That is, unlike freezing or snowfall, that is, in the range of about ± 4 ° C. in the example of FIG. 3, when it is within the range of rain, the computer 1 analyzes or evaluates.

The means for splitting or breaking the water layer 3 are shown diagrammatically in FIG. 2 and arranged according to FIG. This means is a device that produces a jet that mechanically removes the water layer by displacement. As is known, time, air pressure,
The jets that are hydraulically and electrically controlled to exit the storage vessel are gas jets, liquid jets or particulate jets. After the computer has evaluated the characteristic curve range 2, it outputs an output signal, when this signal is "yes" (hydroplaning is present), this jet is directed from the nozzle 13 to the front side of the wheel. The power assistance of the power steering device 15 is then stopped by the device 14, in particular the electronic device 14. This is done, for example, by means of a solenoid valve which reduces the pressure of the steering device. As a result, it is possible to avoid a very dangerous failure of the steering wheel when hydroplaning occurs.

In order to ensure a gentle braking of the vehicle, the device 16 interrupts or throttles the fuel supply to the engine when hydroplaning occurs. this is,
This is done by a solenoid valve, as is usual in vehicles with anti-slip control devices or hydraulic anti-lock devices. Reference numeral 17 indicates a device for mechanically displacing the water layer. This is an elastic mudguard, for example made of rubber, provided in the area of the front bumper of the vehicle. This mudguard is provided on the bumper in front of the wheels so that it can turn in the direction opposite to the running direction.

Variations of the means described above in the examples and variations of their use are possible by the person skilled in the art. Means other than the means for ejecting the jet may be provided, for example antiskid means or antislip means. Other means for improving driving conditions can be used, in particular means for avoiding skids, as well as other sensors, in particular sensors for sensing changes in speed, acceleration or these parameters Is. The same applies to the sensing of pressure or of changes in pressure in a hydraulic system, and further to the use of known means for determining the frictional adhesion of wheels and road surfaces, in particular the frictional adhesion coefficient and its state. The same is true. Furthermore, the same applies to the tire characteristic curve and the characteristic curve stored in the computer, and optionally the modification of the tire characteristic curve.

[0027]

As described above, the anti-hydroplaning device according to the present invention can reduce the risk of general accidents, and particularly, the electronic detection means reliably detects hydroplaning by an intelligent method. Can be recognized, and measures can be taken to suppress and remove it.

[Brief description of drawings]

FIG. 1 is a principle diagram of an automobile equipped with an anti-hydroplaning device.

FIG. 2 is a schematic logic circuit diagram.

FIG. 3 is a diagram showing characteristics.

[Explanation of reference numerals] 1 computer 2 characteristic curve range 4 traveling device vibration sensor 6 vehicle body vibration sensor 8, 9, 10 rotation speed sensor 11 temperature sensor 13 water layer dividing means 17 water layer displacement means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Rüdijgel Boeder Germany, Aying, Obererdorf Strasse, 5 Ar (72) Inventor Hartmut Schmidt Germany, Petershausen, Lerchen Wake , 15

Claims (9)

[Claims] 1. A medium for obtaining good road surface retention of a tire is time-controlled by a computer to be discharged from the front side of a vehicle wheel, and the medium mechanically pushes away a water layer, and the medium is gas. A jet forming a liquid, particles or a mixture of at least two of these is provided, which is provided with electronic means for analyzing and evaluating the processed signals fed from individual sensors to a computer evaluation device, in particular roadways. The following sensors a) to d) a) for sensing the ambient temperature of the vehicle in order to detect hydroplaning in an automobile anti-hydroplaning device for improving the road surface retention of a tire despite the accumulation of water. Temperature sensor b) Sensor for detecting the vibration state of traveling device c) Vehicle susceptible to water sprayed from road A sensor for detecting a vibration state of at least a part of a body d) An anti-hydroplaning device characterized by intelligently combining signals of a sensor for detecting a wheel rotation speed in order to detect a slip of a wheel. 2. An optical or audible alarm is given to the driver of the vehicle after the computer compares it with the predetermined data and recognizes whether the signal is within the hydroplaning range of the characteristic curve diagram or Anti-hydroplaning device according to claim 1, characterized in that measures are taken to weaken or eliminate the hydroplaning. 3. An antihydroplaning device not only providing means for eliminating hydroplaning, but also providing controlled braking, in particular by throttling the fuel supply of the drive machine. Anti-hydroplaning equipment. 4. The anti-hydroplaning device according to claim 1, wherein the anti-hydroplaning device takes measures to remove hydroplaning and at the same time, the power of the power steering or the servo steering is stopped. Hydroplaning equipment. 5. The antihydroplaning device according to claim 1, wherein the sensor for detecting water sprayed on at least a part of the vehicle body is formed as an acoustic sensor. 6. The sensor according to claim 1, wherein the sensor is formed so as to electronically detect the vibration state of the traveling device together with a means for detecting the floating of the tire during hydroplaning. Any one anti-hydroplaning device. 7. Antihydroplaning device according to claim 6, characterized in that the means are embodied as an acoustic sensor, which sensor is attached to the axle of the vehicle and is connected to a frequency analysis device. 8. Antihydroplaning device according to claim 6, characterized in that the means comprise an optical sensor, in particular a laser sensor, for detecting the curvature of the road contact surface of the tire. 9. A frequency analyzer according to claim 1, wherein the frequency analysis device is configured to evaluate the vibration state and to detect a change in amplitude and phase at a predetermined time each time. Any one anti-hydroplaning device.