JPS60500856A - Capsize warning system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Capsize warning system The present invention provides a method for carrying loads mounted on wheel assemblies with or without intermediate suspension. This invention relates to a rollover warning system for use in automobiles with a chassis.

Such vehicles, especially trucks and articulated trucks, Driving through curves at high speeds can lead to capsizing. such agitation The speed at which this can occur is extremely low, especially on tight curves such as on roundabouts. It can be low.

Various proposals have been made to warn about vehicle rollovers and even to prevent rollovers. A plan is being made. One of them is described in French Patent No. 2,352,692. , which means that the surface of the mercury tank beyond a given angle with respect to the vehicle's transverse plane This is done by optical detection. The other one is the published British specification letter 2, 066.538A, which correlates vehicle speed with steering angle. Similarly, when danger approaches, operate the alarm and interfere with vehicle control. Ru. The third technique is described in the published British Specification Letter No. 2,088,606A. proposed an accelerometer that measures lateral acceleration.

The first two ignore vehicle loads, which are the most important factor in determining an impending rollover. In addition, it is extremely difficult to plan to ignore the driver's control operations, especially the driver's non-driving operation. It is extremely dangerous. The third system places accelerometers on the axle and chassis, respectively. and acknowledge that their motions differ as a result of the flexible suspension. this Some parts of the system do not exist and are unlikely to exist because they are prohibitively expensive. The nature of curves to be negotiated, such as nearby signs or signal loops below the road surface. Relies on external indications of quality. For other parts, compare the speed of the sword to the side. From these, determine the rolling angle of the chassis. This and the instantaneous lateral acceleration and maximum The relationship between the expected full sway angle and the large permissible acceleration determines the operation of the J alarm. . This takes into account the built-up loads, but only reads the acceleration display. be. The load is to be determined by other means, its center of gravity is calculated, and this is the maximum It is converted into a reference signal representing the permissible chassis acceleration. Another one sways at a small angle. However, detection of the actual roll angle from the acceleration signal has uncertain accuracy in practice. becomes. This is achieved by replacing the previously proposed pendulum that can measure angles. can be detected, but the unavoidable damping effect makes those answers unduly slow.

Limitations and no need to verify loading and center of gravity by other means before traveling to have a signal that is more distinguishable and immediately useful than the physically different accelerations and angles. This is a significant advantage. It is also possible to predict the danger of overthrow as quickly as possible. is also beneficial.

According to one aspect of the invention, a shaft mounted on one or more wheel assemblies is provided. A rollover warning system is provided for vehicles with The degree to which the center of the vehicle moves is determined by combining the names to produce the electrical signal to be displayed. means spaced laterally on the axle for determining the maximum scheduled movement of said movement signal; Means for comparing with the electrical signal indicating great safety movement and the comparison to said maximum value. and means for activating the linkage upon indication of approach.

According to another aspect of the invention, a chassis mounted on one or more wheel assemblies A rollover warning device is provided for vehicles having laterally spaced for determining the velocity and/or acceleration of the effective center of movement of the a means for calculating the predicted maximum movement of the center of loading; , compare this predicted maximum movement of the loading center with the planned maximum safe movement. and means for activating an alarm when the comparison indicates an approach to said maximum value. 〇 Generally, the chassis is mounted on one or more wheel assemblies by means of a flexible suspension. Can be attached. means for combining said signals in order to determine the overall loading; exist, and the calculation means correspond to the suspension's flexibility and damping for a defined load. It has at least one 4-meter.

The load signal generating means is arranged to generate a signal corresponding to the bending moment of the axle. It is desirable that the strain transducer is Such a converter is covered by British Patent No. 2.0. It may be of the type described in No. 50,624B.

For a better understanding of the invention, reference may be made to the accompanying drawings, in which exemplary embodiments are now shown. Described.

that time: FIG. 1 is a schematic end view of a vehicle with a transducer mounted on the axle.

FIG. 2 is a block diagram of a vehicle overturn warning system.

FIG. 3 is a diagram showing the characteristic curve obtained from the axle transducer.

In FIG. 1, a load M including the chassis of the vehicle is placed on an axle 3 with wheels 4 and 5. carried by flexible suspensions indicated by arrowed lines 1 and 2 at There is.

Strain dirge transducers 6 and 7 are connected to the vehicle tension on either side of the axle center point. Installed symmetrically. The suspension spacing is S, the transducer spacing is T, The distance between the vehicles is W, and the height of the center of mass of the load M above the axle is H. Hanging The suspension forces are SL and SR (L and R indicate left and right when looking towards the figure), The bending moments in the transducer are TL and TR, and the ground reaction force on the wheels are WE and WR. Sideways on the load, for example as a result of the car cutting a curve The force is F.

First, assume that these transducers each provide an output proportional to the bending moment. It has been shown that this results in a signal that may indicate a tendency to overturn. Sara The assumption is that the axles are symmetrical and that the mass on the suspension is 0 which is concentrated in the load of The bending moments in transducers 6 and 7 are: The total bending moment is (1) + (2): TI, +TR = W (WL + WR) - 3 (S L + SR) ( 3) Also assume that Mg = S L + S R = WL + WR (4) regardless of F. and therefore the total bending moment is from (3) and (4): TI, +TR = Mg < w-s ) (5) Thus, the total output signal of the converter is It is proportional to M (W and S are constants).

The equal moments in the presence of a beak force F are: Transformation 6 Between the bending moments The difference is (1) - (2) TL - TR = T ((WR - WL) - (SR - 8L)) (7) Substituting (6) into (7)K Thus, the difference between the transducer output signals is proportional to F.

The dangerous point is WR = 0 (g) exists when the vehicle is at the point of overturning. In this state ( Substituting (9) and (4) into (6) yields QO and (8): The total bending moment is still TL+TR=Mg<w-s> (5) This is called the risk ratio.

WR)O, the difference-to-sum ratio R is less than T/S, so again the output of the converter The force is processed to continuously check the value of the ratio, and if it approaches the T/S, an alarm is issued. generate information.

Similar considerations can lead to similar results when there is a lateral shift of the load or the vehicle is strained. give.

The approach to the danger point is thus determined from the ratio R between the sum and the different responses of the sensor. , and the limit value of this ratio depends on the vehicle constants of the spacing between sensors and the spacing between suspension points. Exists.

Turning to FIG. 2, the outputs of strain darts 6 and 7 are amplified at 8 and 9, and A - Digitized in the D converter 1o and sent to the microcomputer 11 Sent. This microcomputer processes the strain r-gear signal and also It has an output that energizes alarm indicators 12, 13, and 14 in response to. It is clear from the figure As such, these can indicate quantities, indicate directional alerts by illuminated arrows, and sound an audible alarm. This micrometer is used to indicate axle load and to notify overload. It may be of a type already used to generate , and will not be described in detail.

is the ratio (dangerous ratio) that the difference signals from the left and right sensors are to the sum of the signals. The vehicle is shown to be on the verge of overturning. Actual at any given moment The difference between the ratio and the dangerous ratio is the safety limit. However, in the dynamic state , suspension warnings that a dangerous condition may occur that cannot be corrected unless appropriate action is taken. Flexibility will allow. This tendency is alleviated by suspension damping and nonlinearity. It is something that

Advance warning is, in principle, the acceleration of the movement, the speed of movement and the movement of the effective load. , can be obtained by continuously calculating from the maximum movement that occurs without proper operation. I can do it. The calculations take into account the suspension flexibility and special loads as extra inputs. Requires at least one parent parameter corresponding to the buffer. Kayona Senlame The range of data can serve as a constant on the automatic lookup table and can also be used as an appropriate singular or plural range. can be indicated symbolically with respect to each other: or they can be expressed as the sum of the converter outputs (equation ( 5) stored and automatically recalled according to the load, which can be determined from be able to. The degree to which a rollover warning precedes an accident is a function of the vehicle's suspension time constant. Probably.

For example, consider the effect of a sudden sideways force on entering a constant radius curve. cormorant. The various reactions are shown in FIG.

The first graph (,) shows that at constant speed and radius, the lateral force F is applied over time C. remains constant as well.

The second graph (b) shows that the difference/total ratio R from the transducer changes at a certain speed depending on the weight of the load. It also increases to a certain degree, indicating that the suspension affects the curve.

The speed and acceleration of the load movement are shown in the third graph (C) and the fourth graph (d). and has a characteristic curve of The peaks of either or both characteristic curves, which can be easily detected during D, are the final maximum It can be used to calculate the ratio. The effect of the dynamic dynamic characteristic curve of the suspension is the full load All the necessary information is available in the sensor, as it can be practically predicted from the available from the sensor.

The transducer can be mounted on one or any number of axles, and if two or more When things are so equipped, any one of the transducer pairs is independent of the other. It is well understood that the scales give an alarm.

Brief description of the drawing 77t’7-: (:”;”r=i not changed) Special FJ, 6 [1-500858 (4) I=,,3 E( t□ Procedural amendment form C) Showa 0th year Buddhist month ψ day Manabu Shiga, Commissioner of the Patent Office (branch) 2. Name of the invention Relationship to the incident: Applicant Address: 330 Kokusai, Marunouchi Yaesu Building, 2-6-2-2, Kawame Marunouchi, Nanayo, Tokyo Investigation report

Claims (1)

[Claims] 1. Rollover # for vehicles with a chassis mounted on one or more wheel assemblies In the information device, the device generates an electrical signal indicative of the local loading means; The signals are combined to determine the extent to which the center of the vehicle moves laterally on the axle. spaced apart means and an electrical signal indicative of a maximum safe movement intended for said movement signal; means for comparing and activating an alarm when the comparison indicates approach to said maximum value; and means for overturning. 2. Rollover guard for vehicles with a chassis mounted on one or more wheel assemblies In the information device, the device determines from the signal the speed and speed of movement of the effective center of the load. / or laterally spaced means for determining the acceleration and then the loading. A means for calculating the predicted maximum movement of the center and this predicted movement of the center of loading. a means for comparing the maximum safe travel planned with the maximum safe travel planned; an overturn warning system comprising means for activating a # alarm when indicating approach to a maximum value; Place. 3. The chassis is mounted on one or more wheel assemblies by means of a flexible suspension. , and there is a means for combining said signals to determine the overall loading. Calculation means correspond to the suspension's flexibility and damping for a defined load. Claim 2 comprising an input for at least one parameter. equipment. 4. Claim 1, wherein the means for generating the load signal is a strain transducer; Device 0 according to paragraph 2 or paragraph 3 5. The strain transducer is arranged to produce a signal corresponding to the bending moment of the axle. 5. A device according to claim 4, comprising: