KR20130125108A - Device for monitoring tire safety index and method thereof - Google Patents

Abstract

A device and a method for monitoring tire safety indexes by using a vehicle network are disclosed. The device and method aim for the safety of drivers by collecting the speed information of various kinds of vehicles from a vehicle control unit, collecting the inclination information according to weights and gradient of the vehicle from an inclination sensor based on CAN communication installed on an axle plate spring and the top end of a vehicle body, detecting a vehicle driving safety condition based on the tire safety index by using the collected speed and inclination information of the vehicle, and controlling an engine control unit and a transmission control unit inside the vehicle when a dangerous situation is detected. [Reference numerals] (110) Engine control unit;(120) Transmission control unit;(130) Cluster control unit;(200) Axle plate spring inclination sensor;(300) Vehicle body inclination sensor;(400) OBD terminal;(510) Vehicle state judging unit;(520) Vehicle control signal generating unit;(AA,BB,HH) Vehicle speed signal;(CC) Inclination information and vehicle speed (7);(DD) Vehicle information display unit;(EE) Inclination information and vehicle speed;(FF) Transmit tire load and safety index;(GG) Vehicle speed signal (front, back, left, right);(II) Inclination value of sensors;(JJ) Vehicle control signal;(KK) Control vehicle speed and engine starting

Description

Device for monitoring tire safety index using vehicle network and method thereof

The present invention relates to a vehicle-related technology, and more particularly to a technology for measuring the weight of the vehicle and monitoring the tire safety index through the measurement.

BACKGROUND OF THE INVENTION An invention relating to a weighing apparatus for a vehicle and a measuring method thereof are known from Japanese Patent Laid-Open No. 10-2004-0088107. This weighing device and measuring method measures the leaf spring deformation value of the suspension device that changes as the cargo is loaded in the loading box, and loads the axial or gross weight of the cargo measured by a formula previously obtained through regression analysis based on this value. The vehicle's weight can be easily measured by displaying it to the user in real time, and furthermore, accurate weight can be measured without being greatly influenced by the cargo loading pattern. However, such a prior art has a problem in that the displacement sensor is installed on the piston for vertically reciprocating motion inside the vehicle in order to measure the deformation amount of the leaf spring, so that it is difficult to attach or detach the sensor part due to aging or failure of the sensor component.

An object of the present invention is to provide a technical solution that can accurately monitor the vehicle tire safety index while facilitating the removal of the sensor component due to aging or failure.

Vehicle safety index monitoring apparatus using a vehicle network according to an aspect of the present invention for achieving the above object is a vehicle network communication terminal, and vehicle speed information and axle leaf spring and the vehicle from the vehicle controllers and tilt sensors through the terminal; And collecting the vehicle body slope information, and determining whether the tire safety index is in a normal range based on the collected information. The terminal is an OBD (On Board Diagnostics) terminal.

The hub collects vehicle speed information from an engine controller, a transmission controller, a cluster controller, and a tire pressure monitoring system, collects the leaf spring inclination information from the inclination sensor of each of the axle leaf springs, and the inclination of the body from the inclination sensor. Collect information. Preferably, the hub calculates the weight value of the axle based on the collected leaf spring slope information, corrects the calculated axle weight value based on the bodywork slope information, and corrects the corrected axle weight value and the collection. It is determined whether the tire safety index is in the normal range according to the obtained vehicle speed information. Further, when the tire safety index is out of the normal range, the hub transmits a signal for controlling at least one of vehicle speed limit and engine start-off to the controller.

On the other hand, the vehicle safety index monitoring method using a vehicle network according to an aspect of the present invention for achieving the above object collects the vehicle speed information from the plurality of controllers in the vehicle through the vehicle network, axle leaf spring slope information and Collecting body inclination information, calculating weight values of the axles based on the collected axle leaf spring inclination information for each leaf spring inclination sensor, and calculating the weight values of the calculated axles, respectively. And correcting the tire safety index based on the corrected axle weight value and the collected vehicle speed information.

The method further includes transmitting a signal for controlling at least one of vehicle speed limit and engine start-off to a corresponding one of the controllers when the tire safety index is out of the normal range.

The present invention makes it possible to easily attach and detach the hub unit to the OBD terminal without changing inside the vehicle. In addition, the present invention determines the vehicle safety situation by real-time monitoring the multiple vehicle speed information, leaf spring and the slope of the vehicle body through the CAN network, and the vehicle speed down and engine start-off control by using the CAN signal when determining the risk situation can do.

According to the present invention, since the vehicle network (CAN, MOST, etc.) can be implemented in all vehicle models that can be transmitted, it is possible to improve the system performance only by replacing the sensor parts and updating the software. In addition, the tilt sensor of the leaf spring and the vehicle body is fixed at the top of the leaf string and has a CAN network interface, so it is easy to attach or detach the sensor component due to aging or failure. In addition, it is unnecessary to release the vehicle device according to the detachment. In addition, the sensor-monitoring CAN hub is mounted on-board in the vehicle for real-time viewing from the driver's seat.

1 is an overall system configuration for monitoring the tire safety index using a vehicle network according to an embodiment of the present invention.
2 is a system structural diagram showing a sensor attachment and network connection configuration according to an embodiment of the present invention.
3 is an overall system block diagram further embodying the hub configuration of FIG. 1 in accordance with an embodiment of the present invention.
4 is a graph showing the axle weight according to the leaf spring slope.
5 is a graph showing the axle weight according to the body slope.
6 is a graph showing the tire safety index and state according to the vehicle speed / axle weight.
7 is a flowchart illustrating a tire safety index monitoring method using a vehicle network according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is an overall system configuration diagram for monitoring a tire safety index using a vehicle network according to an embodiment of the present invention, Figure 2 is a system structure diagram showing a sensor attachment and network connection configuration according to an embodiment of the present invention.

As shown, the system includes a vehicle controller 100, an axle leaf spring tilt sensor 200, a vehicle body tilt sensor 300, an OBD terminal 400, a hub 500, and a vehicle information display 600. The vehicle controller 100 is configured to generate a vehicle speed, and the vehicle controller 100 includes an engine controller, a transmission controller, a cluster controller, and a tire pressure monitoring system (TPMS). Here, the engine controller, the transmission controller, and the cluster controller each generate one vehicle speed information, and the tire pressure monitoring system generates three vehicle speed information from four wheels. They all transmit vehicle speed information via the vehicle OBD terminal 400 to the CAN network. Axle leaf spring inclination sensor 200 is composed of four sensors for detecting the deformation inclination information (tilt value) of the leaf spring according to the load of each of one axis, two axes, three axes and four axes, the detected leaf spring The modified slope information of the vehicle is transmitted to the CAN network through the OBD terminal 400. The vehicle body inclination sensor 300 is configured as a sensor for detecting inclination information (tilt value) of the vehicle body, and transmits the inclination direction information of the vehicle body to the CAN network through the vehicle OBD terminal 400.

The OBD terminal 400 outputs vehicle speed information and slope information to the hub 500. The hub 500 may be referred to as 'sensor monitoring CAN HUB'. The hub 500 collects multiple (7) vehicle speed information from the vehicle controller 100 through the vehicle OBD terminal 400, collects axle leaf spring inclination information from the axle leaf spring inclination sensor 200, and acquires vehicle body inclination. Collecting inclination information of the vehicle body from the sensor 300. The hub 500 calculates the axle weight for each axle leaf spring inclination sensor based on the collected axle leaf spring inclination information and the inclination information of the vehicle body, and determines whether the tire safety index is in a normal range using the calculated axle weight and vehicle speed information. do. In addition, the vehicle information display unit 600 displays the vehicle weight and the tire safety index transmitted from the hub 500.

FIG. 2 is a block diagram illustrating the entire system and the hub configuration of FIG. 1 according to an embodiment of the present invention. FIG. 3 is a graph showing axle weight according to leaf spring inclination, and FIG. 4 is axle according to vehicle body inclination. 5 is a graph showing the weight, Figure 5 is a graph showing the tire safety index and state according to the vehicle speed / axle weight.

The hub 500 includes a vehicle state determiner 510 and a vehicle control signal generator 520. The vehicle state determination unit 510 periodically collects vehicle multi-speed information from the engine controller 110, the transmission controller 120, the cluster controller 130, and the TPMS 140 through the OBD terminal 400. Collect inclination values of axle leaf springs and bodywork from inclination sensors. The vehicle state determining unit 510 calculates each axle weight value using the collected inclination values for the axle leaf spring inclination sensors, and the equation is expressed by Equation 1 below.

Where Y is the axial weight, X is the slope value, and C is the axial weight at tolerance. And S is the leaf spring area, L is the leaf spring length, and α is the leaf spring material factor. The vehicle state determination unit 510 corrects the axle weight value calculated using Equation 1 for each axis (1 to 4 axes), and the equation for correction is shown in Equation 2.

Where Y is the weight for each axis corrected, X is the body tilt value, C is the initial value for each axle, and α is the correction factor for each axle. The vehicle state determination unit 510 uses the axle weight and the vehicle speed information calculated using Equation 2 to determine whether the tire safety index is within the normal range or outside the normal region, as shown in FIG. 8. Determine. When the vehicle belongs to the dangerous area, the vehicle control signal generator 520 transmits the vehicle control signal through the vehicle OBD terminal 400 according to the vehicle speed and / or the engine start-off control command of the vehicle state determination unit 510. And / or send it to the engine controller. In addition, the vehicle control signal generator 520 transmits a vehicle control signal for alarming the warning light to the cluster controller 130 through the vehicle OBD terminal 400. The vehicle information display unit 600 receives the tire load and the safety index from the vehicle state determination unit 510 and displays it on the vehicle information display screen.

6 is a flowchart illustrating a tire safety index monitoring method using a vehicle network according to an embodiment of the present invention.

The hub 500 collects multiple (7) vehicle speed information from in-vehicle controllers (engine controller, transmission controller, TPMS, cluster controller), and also collects two axle leaf springs and inclination values of the vehicle body from the inclination sensor. (S100). Hub 500 calculates the weight value for each axle (1 to 4 axes) using the collected axle leaf spring inclination value (S200). The specific calculation is as in Equation 1. Next, the hub 500 corrects the calculated axle leaf spring based axle weight value for each axis (1 to 4 axes) using the vehicle body tilt value (S300). The hub 500 determines the tire safety index state using the corrected calculated axle weight value and the vehicle speed value (S400). When the tire safety index value (vehicle speed / axle weight) is 20% or more than the previously stored safety index reference value, the hub 500 determines that the vehicle is in a dangerous state requiring control, and otherwise, determines that the vehicle is in a normal state. If it is determined that the steady state, the hub 500 processes the steady state logic such as outputting the load and safety index information of the vehicle tire to the vehicle information display unit 600 (S500). If determined to be in danger, the hub 500 can issue a vehicle slowdown and / or vehicle immobilization command to the engine controller and / or the transmission controller via the CAN network at the OBD terminal 400. Send it as a message. In addition, the hub 500 transmits a vehicle control signal to the cluster controller 130 to control the warning light provided in the cluster instrument panel. Thereafter, the hub 500 determines whether the vehicle is started on / off and terminates the safe driving monitoring logic when the vehicle is in the off state. When the hub 500 starts, the hub 500 moves to the vehicle speed information and the inclination value collection step (S700).

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: vehicle controller 110: engine controller
120: transmission controller 130: cluster controller
140: TPMS 200: axle leaf spring tilt sensor
300: vehicle body tilt sensor 400: OBD terminal
500: hub 510: vehicle status determination unit
520: vehicle control signal generator 600: vehicle information display unit

Claims (7)

Terminal for vehicle network communication; And
A hub which collects vehicle speed information, axle leaf spring and body tilt information from vehicle controllers and tilt sensors through the terminal and determines whether the tire safety index is in a normal range based on the collected information;
Vehicle safety index monitoring device using a vehicle network comprising a. The method of claim 1,
The terminal is a vehicle safety index monitoring device using a vehicle network, characterized in that the OBD (On Board Diagnostics) terminal. 3. The method according to claim 1 or 2,
The hub collects vehicle speed information from an engine controller, a transmission controller, a cluster controller, and a tire pressure monitoring system, collects the leaf spring inclination information from the inclination sensor of each of the axle leaf springs, and collects the inclination information from the body inclination sensor. Vehicle safety index monitoring device using a vehicle network, characterized in that collecting the. The method of claim 3,
The hub calculates the weight value of the axle based on the collected leaf spring slope information, corrects the calculated axle weight value based on the bodywork slope information, and corrects the corrected axle weight value and the collected vehicle. Vehicle safety index monitoring device using a vehicle network, characterized in that for determining whether the tire safety index is in the normal range according to the speed information. 5. The method of claim 4,
And the hub transmits a signal for controlling at least one of vehicle speed limit and engine start-off to the corresponding controller when the tire safety index is out of the normal range. Collecting vehicle speed information from a plurality of controllers in the vehicle through a vehicle network, and collecting axle leaf spring tilt information and body tilt information;
Calculating weight values of the axles based on the collected axle leaf spring inclination information for each leaf spring inclination sensor;
Correcting the weight values of the calculated axles based on the collected vehicle body tilt information; And
Determining whether the tire safety index is in a normal range according to the corrected axle weight value and the collected vehicle speed information;
Tire safety index monitoring method using a vehicle network comprising a. The method according to claim 6,
Transmitting a signal for controlling at least one of vehicle speed limit and engine start-off to a corresponding one of the controllers when the tire safety index is out of the normal range;
Tire safety index monitoring method using a vehicle network, characterized in that it further comprises.

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