JP2006123581A - Tire air pressure monitoring device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire air pressure monitoring device for a vehicle capable of suitably determining air pressure abnormality of a tire even in the case of recommended tire air pressure different from that at usual time such as at loading of a baggage and towing and expecting avoiding danger and enhancement of fuel consumption. <P>SOLUTION: The tire air pressure monitoring device for the vehicle has a tire low pressure threshold value correction means for detecting variation of load to the tire 2 attached to the vehicle 1 by loading of the baggage and towing and correcting the tire low pressure threshold value. Thereby, the air pressure abnormality of the tire can be suitably determined even in the recommended tire air pressure different from that at the usual time such as at loading of the baggage and towing and avoiding of danger and enhancement of fuel consumption can be expected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tire pressure monitoring device for a vehicle that monitors the air pressure of a tire mounted on the vehicle and displays or notifies when there is an abnormality.

  As a conventional tire pressure monitoring device, one as shown in FIG. 5 is known (see, for example, Patent Document 1).

  First, in terms of configuration, each tire 2 mounted on the vehicle 1 is provided with an air pressure detection device 3 having an air pressure sensor, a microcomputer, and a transmitter (all not shown). A vehicle-mounted control unit 4 having a machine 10 and a microcomputer 11 is installed.

  The operation of such a tire air pressure monitoring device will be described. The tire air pressure detected by the air pressure sensor in the air pressure detecting device 3 attached to each tire 2 is the identification code set for each tire 2 in the microcomputer. It is attached and transmitted from the transmitter.

This transmission signal is received by the receiver 10 of the in-vehicle control unit 4 and compared with a tire low pressure threshold value and an identification code registered in advance in the microcomputer 11, and when the tire pressure is lower than the tire low pressure threshold value. It is determined that there is an abnormality, and the fact that the abnormality is present is displayed on the display device 12 mounted inside the vehicle 1 together with the corresponding tire.
JP 2001-248339 A (paragraphs of FIGS. 4, 5, and 0003)

  However, in the conventional tire pressure monitoring device, since only one tire low pressure threshold is set for the recommended tire pressure at the normal time, a larger load than the normal time is applied to the tire, such as when loading or towing. In the case where the recommended air pressure is changing as in the case, it is not possible to appropriately determine the tire air pressure abnormality.

  Therefore, the present invention can appropriately determine a tire pressure abnormality even when the recommended tire pressure is different from the normal time, such as when loading or towing, and can be expected to avoid danger and improve fuel efficiency. An object of the present invention is to provide a vehicle tire pressure monitoring device.

In order to achieve the above object, the invention of claim 1 comprises tire pressure detecting means for detecting the pressure of a tire mounted on a vehicle for each tire,
Tire pressure determining means for comparing the pressure of each tire with a preset tire low pressure threshold;
Tire low pressure notification means for informing that the tire pressure is lower than the tire low pressure threshold;
A tire pressure monitoring device for a vehicle having tire low pressure threshold correction means for detecting a change in load on a tire mounted on the vehicle and correcting the tire low pressure threshold.

  Here, the fluctuation of the load on the tire mounted on the vehicle in the present invention is a fluctuation caused by applying a load larger than usual to the tire when the vehicle is stopped or when the vehicle is running, and when the vehicle is stopped and when the vehicle is running. This is due to the loading of a load whose fluctuation is detected in both cases, towing where the fluctuation is detected when the vehicle is traveling, and the like.

  According to the first aspect of the present invention configured as described above, the tire low pressure threshold correcting means for correcting the tire low pressure threshold by detecting a change in load on the tire mounted on the vehicle is provided.

  As a result, even when the recommended tire pressure is different from the normal time, such as when loading or towing, the tire pressure abnormality can be properly judged, and it can be expected to avoid danger and improve fuel efficiency. become.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  The same or equivalent parts as those in the conventional example will be described with the same reference numerals.

First, from the configuration, as shown in FIG. 1, the tire pressure monitoring device of the present embodiment is as follows.
A tire air pressure detection device 3 is attached to each tire 2 mounted on the vehicle 1, and an in-vehicle control unit 4 is installed in the vehicle 1.

  Further, a luggage sensor 5 for detecting the presence / absence of luggage loading is installed in the trunk room or luggage room (not shown) of the vehicle 1, and the presence of a towing vehicle (not shown) is installed at the rear of the vehicle 1. A tow vehicle sensor 6 to be detected is attached, and both the luggage sensor 5 and the tow vehicle sensor 6 are electrically connected to the in-vehicle control unit 4.

  The luggage sensor 5 and the tow vehicle sensor 6 differ depending on the type of vehicle, but either one or both may be attached.

  As shown in FIG. 2, the tire air pressure detecting device 3 includes a pneumatic sensor 7 that detects the tire air pressure, a microcomputer 8 that adds an identification code assigned to each tire 2 to the air pressure data, and a microcomputer 8. The transmitter 9 wirelessly transmits the data signal to the in-vehicle control unit 4.

  As shown in FIG. 3, the in-vehicle control unit 4 compares the received air pressure data with a preset tire low pressure threshold value and the receiver 10 that receives the data signal from the tire air pressure detecting device 2. And a microcomputer 11 for determining which tire 2 the transmitted air pressure data belongs to.

  In the microcomputer 11, when there is an output from the luggage sensor 5 and the tow vehicle sensor 6, the tire low pressure threshold S1 stored in the built-in storage device is set to the threshold S2 (= S1 + ΔS). A change is made to determine whether there is an abnormality (ΔS is an increase in the threshold value).

  A display device 12 and a notification device 13 are mounted inside the vehicle 1 and are electrically connected to the vehicle-mounted control unit 4 and operate when the tire air pressure is lower than the tire low pressure threshold. It is like that.

  Next, the operation of this embodiment will be described.

  In the tire pressure monitoring device 3 configured as described above, the tire pressure of each tire 2 is detected by the air pressure sensor 7, and an identification code set for each tire 2 is attached to the air pressure data by the microcomputer 8. The air pressure data for each tire 2 to which the identification code is assigned from 9 is transmitted at predetermined time intervals.

  This transmission signal is received by the receiver 10 of the in-vehicle control unit 4 and compared with a tire low pressure threshold value registered in advance in the microcomputer 11 and an identification code is determined.

  Here, when there is no load loading or towing, the tire low pressure threshold S1 stored in advance in the storage device of the microcomputer 11 as the normal value is applied.

  On the other hand, when a signal is output from either the luggage sensor 5 or the tow vehicle sensor 6, it is determined that there is a change in the tire load, and the tire low pressure threshold S2 ( = S1 + ΔS) and stored.

  As described above, when there is no load loading or traction, it is determined that the tire pressure is abnormal when the tire pressure is lower than the tire low pressure threshold S1, and when there is load loading or traction, the tire When the air pressure is lower than the tire low pressure threshold S2, it is determined that there is an abnormality. In any case, an abnormality is displayed on the display device 12, and a notification is given from the notification device 13 by a buzzer sound or the like. The

  FIG. 4 shows a display of a tire pressure monitoring device installed around the driver's seat of the vehicle.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment, the example in which the memory content in the microcomputer 11 is changed from the tire low pressure threshold value S1 to S2 has been described. However, both the S1 and S2 are stored in advance, and the load sensor 5 S may be applied when there is no output from the sensor 6, and S2 may be applied when there is an output.

  Moreover, although the said embodiment demonstrated the case where both the display apparatus 12 and the alerting | reporting apparatus 13 were provided, these should just be provided with either one.

It is a block diagram explaining the whole structure of the tire pressure monitoring apparatus of the best embodiment of this invention. It is a block diagram explaining the tire pressure detection apparatus in the tire pressure monitoring apparatus of the best embodiment of the present invention. It is a block diagram explaining the vehicle-mounted control unit in the tire pressure monitoring apparatus of the best embodiment of this invention. It is a front view of the display in the tire pressure monitoring device of the best embodiment of the present invention. It is a block diagram explaining the whole structure of the tire pressure monitoring apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Tire 3 Tire air pressure detection apparatus 4 Car-mounted control unit 5 Cargo sensor 6 Vehicle traction sensor 7 Air pressure sensor 8 Microcomputer 9 Transmitter 10 Receiver 11 Microcomputer 12 Display device 13 Notification device

Claims (1)

Tire pressure detecting means for detecting the air pressure of the tire mounted on the vehicle for each tire;
Tire pressure determining means for comparing the pressure of each tire with a preset tire low pressure threshold;
Tire low pressure notification means for informing that the tire pressure is lower than the tire low pressure threshold;
A tire pressure monitoring apparatus for a vehicle, comprising tire low pressure threshold correction means for detecting a change in load on a tire mounted on the vehicle and correcting the tire low pressure threshold.

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