JPH06312612A - Overturn alarm device for vehicle - Google Patents

Abstract

PURPOSE:To actuate an alarm when the driving state with the risk of a vehicle rolling continues for the specified time so as to urge a driver to safe driving. CONSTITUTION:An overturn alarm device for a vehicle is provided with a lateral acceleration sensor 9 disposed in the center-of-gravity position of the vehicle, load sensors 1a-4a disposed at spring seats in the suspension mechanism of the respective wheels, an overturn risk computing means for obtaining the state of lateral acceleration gY detected by the lateral acceleration sensor 9 being the specified value or more and the load Fi of at least one of the wheels detected by the load sensors 1a-4a being the specified value or less, and an alarm driving means for driving an alarm 6 when the driving state with the risk of roll continues for the specified time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle rollover warning device for preventing reckless driving such as a sharp turn.

[0002]

2. Description of the Related Art A device for preventing rollover during a sharp turn of a vehicle includes a vehicle height sensor, a vehicle speed sensor, a steering angle sensor and other signals for detecting vertical displacement of the wheel when the vehicle turns, and Lifting is discriminated, brake slip control is stopped, engine output is reduced, and rollover is avoided.
168555), and when the center-of-gravity slip angle during turning of the vehicle is not within the proper range, there is known one in which the vehicle height is lowered by a hydraulic suspension mechanism to prevent rollover (JP-A-3-125617). However, the former is equipped with a traction control device and an anti-skidding control device, and the latter is equipped with a hydraulic suspension mechanism with a vehicle height adjustment function, both of which are very expensive. become. Further, both of them work to automatically prevent the vehicle from rolling over regardless of the driver's intention if the vehicle satisfies a dangerous condition, and there is no room for the driver's intention to intervene.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to activate a warning device to prompt a driver to drive safely when a dangerous vehicle overturning condition continues for a predetermined time.
An object is to provide an inexpensive and practical vehicle rollover warning device.

[0004]

In order to achieve the above object, the structure of the present invention comprises a lateral acceleration sensor arranged at the center of gravity of a vehicle and a load sensor arranged on a spring pedestal in a suspension mechanism for each wheel. A rollover risk calculating means for obtaining a state in which the lateral acceleration detected by the lateral acceleration sensor is a predetermined value or more and the load of at least one wheel detected by the load sensor is a predetermined value or less; and a dangerous driving state lasts for a predetermined time. And an alarm device driving means for driving the alarm device at the time.

[0005]

When the absolute value of the lateral acceleration detected by the lateral acceleration sensor while the vehicle is traveling is equal to or greater than a predetermined value, and the load detected by the load sensor provided on the spring pedestal of the suspension mechanism of each wheel is equal to or less than the predetermined value. When it is determined that there is a high risk of rollover of the vehicle and the dangerous driving state lasts for a predetermined time, the alarm device provided on the instrument panel is sounded or blinked.

[0006]

1 is a plan view showing a schematic configuration of a vehicle rollover warning device according to the present invention. The vehicle is provided with a lateral acceleration sensor 9 at the center of gravity, and a load sensor 1a for detecting the load of each wheel 1 to 4 in each suspension mechanism that suspends the left and right front wheels 1 and 2 and the left and right rear wheels 3 and 4. , 2a, 3a, 4a are provided, and an alarm device 6 is provided near the instrument panel 7 on the opposite wall of the handle 8. Preferably, the vehicle speed sensor 5 is connected to the speedometer. For each of the load sensors 1a to 4a, for example, a known one that detects a load as a resistance change is used.

As shown in FIG. 2 as a representative of the load sensor 3a for the left rear wheel, a spring 19 for suspending the axle 20 is mounted on a spring seat or pedestal 17 of the vehicle frame 16 and a spring seat 1 of the axle 20.
8 and supports the load sensor 3a on the vehicle frame 16 and the pedestal 17
It is installed between and.

As shown in FIG. 3, in the present invention, the electronic control unit 10 includes a rollover risk degree calculating means 13 and an alarm device driving means 14.
Based on the signal from the start key switch 12 and the detection signals from the sensors 9 and 1a to 4a, the lateral acceleration gY of the vehicle is equal to or greater than a predetermined value go and the load Fi of each wheel is equal to or less than a predetermined value Fn. The degree of danger of rollover of the vehicle is obtained, and when the dangerous driving state lasts for a predetermined time, an output signal is applied to the alarm device drive circuit to drive the alarm device 6.

FIG. 4 is a flow chart of a control program for performing the above-mentioned control in the electronic control unit 10 composed of, for example, a microcomputer. p11 to p18 represent each step of the control program. This control program is repeatedly executed every predetermined time. This control program starts on p11,
At p12, the calculation unit is initialized, and at p13, it is determined whether or not the engine start key switch 12 is ON. Start key switch 12
If it is OFF, the process proceeds to p18, and if the start key switch 12 is ON, it is determined in p14 whether the lateral acceleration gY in the leftward or rightward direction is larger than a predetermined value go.

When the lateral acceleration gY is smaller than the predetermined value go, the routine proceeds to p18, and when the lateral acceleration gY is larger than the predetermined value go, at p15 the load Fi of at least one wheel is smaller than the predetermined value Fn. Determine whether or not.

When the load Fi of the wheel is larger than the predetermined value Fn, the process proceeds to p18, and when the load Fi of the wheel is smaller than the predetermined value Fn, it means that the wheel is in a floating state, and it is in a dangerous driving state. The duration ti is measured, and it is determined at p16 whether the duration ti of the dangerous driving state is larger than a predetermined value to. When the duration ti is smaller than the predetermined value to, the operation proceeds to p18, and when the duration ti is larger than the predetermined value to, the alarm device 6 is driven at p17 and the operation ends at p18.

The predetermined values go, Fn and to are preset to values before the vehicle rolls over. In the above example,
Instead of determining whether the engine is in operation based on whether the start key switch 12 is ON, the vehicle speed sensor 5 may determine whether the vehicle is traveling. In addition, the load sensors 1a-4
Instead of detecting the load Fi of each wheel by a, even if a vehicle height sensor is provided in each suspension mechanism and the vehicle height change (stroke) of the suspension mechanism becomes abnormally large, the wheels may float. Similar effects can be obtained.

In the present invention, since the start key switch 12 or the vehicle speed sensor 5 is used, the alarm device 6 does not malfunction even if the vehicle is parked on a sideways inclined road surface. Further, when the vehicle passes through a large depression on the road, even if the load on the wheels is temporarily reduced or the vehicle height changes greatly, the duration ti is short, so that the alarm device 6 does not malfunction. In short, the alarm device 6 is activated when the vehicle is traveling on a dangerous lateral slope such as rolling over, when turning sharply at high speed, or when reckless driving such as jumping over a depression on an uneven terrain.

[0014]

As described above, according to the present invention, the lateral acceleration sensor arranged at the center of gravity of the vehicle, the load sensor arranged on the spring pedestal in the suspension mechanism of each wheel, and the lateral acceleration detected by the lateral acceleration sensor. Is a predetermined value or more and the load of at least one wheel detected by the load sensor is a predetermined value or less, and an alarm device that drives an alarm device when a dangerous driving condition lasts for a predetermined time. The driving device is configured to drive the alarm device when the risk of rollover of the vehicle is high based on the signal of the load sensor or the vehicle height sensor arranged in the suspension mechanism of each wheel. It is simple and inexpensive, and economical because it can be used in ordinary vehicles that do not have a traction control device or hydraulic suspension mechanism, which is useful for safe driving.

[Brief description of drawings]

FIG. 1 is a front sectional view of a vehicle rollover warning device according to the present invention.

FIG. 2 is a side view showing an arrangement of load sensors in the rollover warning device.

FIG. 3 is a block diagram of the rollover warning device.

FIG. 4 is a flow chart of a control program of the rollover warning device.

[Explanation of symbols]

1-4: Wheels 1a-4a: Load sensor 5: Vehicle speed sensor 6: Alarm device 9: Lateral acceleration sensor 10: Electronic control device 12: Start key switch 13: Rollover danger degree calculation means 14: Alarm device driving means 17: Pedestal

Claims (2)

[Claims] 1. A lateral acceleration sensor arranged at a center of gravity of a vehicle, a load sensor arranged on a spring pedestal in a suspension mechanism of each wheel, and a lateral acceleration sensor having a lateral acceleration detected by a predetermined value or more, and the load sensor. Of at least one wheel detected by means of a rollover risk degree calculating means for obtaining a state in which the load is equal to or less than a predetermined value, and an alarm device driving means for driving an alarm device when a dangerous driving condition lasts for a predetermined time. Alarm device. 2. A lateral acceleration sensor arranged at the center of gravity of the vehicle, a vehicle height sensor arranged in a suspension mechanism of each wheel, and a lateral acceleration detected by the lateral acceleration sensor is a predetermined value or more. Rollover of a vehicle including rollover risk calculating means for obtaining a state in which the detected vehicle height of at least one wheel is equal to or more than a predetermined value, and alarm device driving means for driving an alarm device when a dangerous driving state lasts for a predetermined time. Alarm device.