JP4737006B2 - Vehicle running state monitoring device - Google Patents

Description

  The present invention relates to a vehicle running state monitoring device that can warn of tire abnormality or road surface condition deterioration.

Conventionally, Patent Document 1 discloses a technique for warning a tire abnormality. In this device, the distance traveled by the GPS receiver is measured, the travel distance of the vehicle is calculated from the output of the vehicle speed sensor, and it is determined whether or not the deviation of both travel distances exceeds the reference value. Is counted a predetermined number of times, the alarm is used to warn the tire of abnormality such as tire wear or tire slip.
Japanese Patent Laid-Open No. 2002-2240

  Incidentally, the cause of tire slip may be due to tire wear, or may be caused by road surface conditions such as freezing and snow accumulation. However, in the above-mentioned conventional ones, tires are uniquely determined only for tire abnormalities such as wear and slip, and road surface conditions such as freezing and snow cannot be determined. In spite of the occurrence of slip, there was a risk of misjudging tire wear.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle running state monitoring device that can distinguish between tire abnormality and road surface condition deterioration.

  In order to achieve the above object, the invention according to claim 1 calculates the absolute travel displacement of the host vehicle from the absolute displacement indexing means for determining the absolute travel displacement of the host vehicle and the vehicle state sensor of the host vehicle. Detects the difference between the theoretical running displacement calculated by the theoretical displacement indexing means, the reporting means, the absolute running displacement indexed by the absolute displacement indexing means, and the theoretical displacement indexing means A displacement difference detecting means that detects the traveling environment information around the position of the host vehicle, a travel environment information obtaining means that obtains traveling environment information around the vehicle position, and a travel abnormality detected when the travel displacement difference detected by the displacement difference detecting means is greater than or equal to a reference value When the travel abnormality is detected by the travel abnormality detection means and the travel abnormality detection means, the travel environment information around the position of the host vehicle is acquired, and the road surface condition is determined on the condition that the travel environment information is specific information. Worsening Determining, consisting comprises determining means for determining deterioration occurrence of the vehicle state on the condition that not the specific information, and a warning means for outputting a result of determination by the determination means to the notification means.

  According to the first aspect of the present invention, whether or not the host vehicle has slipped or idled, that is, whether or not a running abnormality has occurred, can be detected by the running abnormality detecting means when the running displacement difference is greater than or equal to a reference value. . If the travel displacement abnormality is detected, the determination means acquires travel environment information around the vehicle position by the travel environment information acquisition means, and on the condition whether or not the travel environment information is specific information. Since it is determined whether the situation has deteriorated or the host vehicle condition has deteriorated, it is necessary to grasp the driving environment information around the actual vehicle position (information on road surface conditions, outside air temperature, etc.) It is possible to accurately determine whether the host vehicle condition such as occurrence has deteriorated. Then, the warning means causes the notification means to output the determination result, so that the user can know the deterioration of the host vehicle condition such as the occurrence of tire wear, and when the deterioration of the road condition occurs, Therefore, it is possible to distinguish between tire abnormality and road surface condition deterioration.

  In this case, a host vehicle position detection unit that detects the host vehicle position and a communication unit capable of communicating with an external information center are provided, and the traveling environment information acquisition unit is detected by the host vehicle position detection unit. Information relating to road surface conditions is acquired from the information center via the communication means as travel environment information in the vicinity of the vehicle position, and the determination means is configured to use road freezing information or snow cover information as information relating to the road surface conditions. It is good also as a structure which judges the deterioration generation | occurrence | production of a road surface condition on condition that it is, and determines the deterioration generation | occurrence | production of the own vehicle condition on condition that it is not the said specific information.

  In this way, it is possible to recognize the actual road surface condition around the vehicle position from an external information center, and when a driving abnormality such as slip or idling is detected, the driving abnormality is detected as a road surface condition such as road surface freezing or snow cover. It can be accurately determined whether it is caused by the occurrence of deterioration of the host vehicle state such as tire wear.

  In addition, an outside air temperature sensor that detects an outside air temperature is provided, and the traveling environment information acquisition unit is configured to acquire temperature information detected by the outside air temperature sensor as traveling environment information around the vehicle position, and the determination unit includes The temperature information is determined to be a road surface freezing temperature information as the specific information, and the occurrence of the deterioration of the road surface condition is determined on the condition that the temperature information is not the specific information. Good (invention of claim 3).

  In this way, the actual outside air temperature around the position of the host vehicle can be recognized, and when a running abnormality such as slip or idling is detected, if the outside air temperature is a road freezing temperature, the running abnormality is If the outside air temperature is not the road surface freezing temperature, it can be accurately determined that it is caused by the deterioration of the host vehicle condition such as tire wear. .

  The absolute displacement indexing means includes a vehicle position detecting means, which calculates an absolute travel distance as an absolute travel displacement, and the theoretical displacement indexing means includes a vehicle speed sensor as the vehicle state sensor. Then, based on the information from the vehicle speed sensor, the theoretical travel distance may be calculated as the theoretical travel displacement, and the displacement difference detection means may detect the travel distance difference as the travel displacement difference. invention).

In this way, the travel displacement difference can be detected with the configuration including the vehicle position detection means and the vehicle speed sensor, and the configuration can be simplified.
Further, in this case, the absolute displacement indexing means includes a gyroscope in addition to the vehicle position detecting means, and based on the gyroscope, an absolute steering angle is determined as an absolute travel displacement, and the theoretical displacement index is calculated. The output means includes a steering angle sensor that detects a steering angle in addition to a vehicle speed sensor as the vehicle state sensor, and calculates a theoretical steering angle as a theoretical travel displacement based on information from the steering angle sensor, In addition to detecting the travel distance difference as a travel displacement difference, a displacement difference detection means detects a steering angle difference from the absolute steering angle and the theoretical steering angle, and the travel abnormality detection means A travel abnormality may be detected when the travel distance difference and the steering angle difference are greater than or equal to a reference value (invention of claim 5).

  In this way, as the travel displacement difference, the steering angle difference is detected in addition to the travel distance difference, and the travel abnormality detection means detects the travel abnormality when both the travel distance difference and the steering angle difference are equal to or greater than the reference value. Therefore, it is possible to more reliably detect a running abnormality such as slip or idling. As a result, it is possible to more reliably determine whether the road surface condition has deteriorated or the host vehicle condition has deteriorated.

  Further, when the running abnormality is detected by the running abnormality detecting means and the running environment information is not specific information continues for a predetermined number of times, it is determined that the host vehicle state has deteriorated. It may be determined that the road surface condition is deteriorated due to factors other than the environment (invention of claim 6).

  When a running abnormality is detected, the cause of the running abnormality can be determined whether the host vehicle condition such as tire wear has deteriorated or the road surface condition has deteriorated. In addition to the worsening of the road surface conditions, there may be factors other than the driving environment (such as sand or gravel roads during construction). The running abnormality due to the deterioration of the host vehicle condition such as tire wear continuously occurs, and the running abnormality caused by running on sandy or gravel roads occurs only once.

  However, according to the sixth aspect of the present invention, when a running abnormality is detected and the running environment information is not specific information continues for a predetermined number of times, it is determined that the host vehicle state has deteriorated, and unless the predetermined number of times continues. Therefore, in addition to the road environment conditions such as road surface freezing, road area snow and road surface freezing temperature, road surface deterioration such as sand and gravel roads during construction etc. Can also be detected.

  A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a functional block diagram showing an electrical configuration of a vehicle running state monitoring device. The traveling state monitoring device 1 includes a control circuit mainly composed of a microcomputer (absolute displacement indexing means, theoretical displacement indexing means, displacement difference detecting means, traveling environment information acquiring means, traveling abnormality detecting means, judging means, Warning means) 2, a position detector (own vehicle position detection means) 3 for detecting the current position of the host vehicle, a map data input unit 4, an operation switch group 5, an external memory 6, a color liquid crystal display, and the like (Notification means) 7, speakers (notification means) 8, and external information input that transmits and receives data by wireless communication with an external information center 17 such as a VICS (registered trademark) center or various information providing servers. Output device (communication means) 9, vehicle speed pulse input device (vehicle state sensor, vehicle speed sensor) 10, steering angle input device (vehicle state sensor, steering angle sensor) 11, outside air temperature sensor And a support 12.

  The position detector 3 includes a gyroscope 13 that detects the rotational angular velocity of the vehicle, a GPS receiver 15 for a GPS (Global Positioning System) that detects (positions) the current position of the vehicle based on radio waves transmitted from an artificial satellite, A distance sensor 16 for detecting the travel distance is provided. Each sensor 13, 15, 16 has an error of a different property. For this reason, the control circuit 2 detects the current position, traveling direction, speed, travel distance, current time, etc. of the vehicle with high accuracy by using the detected values of the sensors 13, 15, 16 while interpolating. It has become.

  The map data input device 4 is a map data recording medium that records various data such as road map data, landmark data, map matching data, destination data (facility database), and table data for converting traffic information into road data. It is comprised by the drive device for reading data from.

The operation switch group 5 as input means includes a mechanical switch provided near the screen of the display device 7, a touch panel provided on the screen of the display device 7, a remote control, and the like.
The vehicle speed pulse input device 10 generates a pulse corresponding to the rotational speed of the wheel and inputs it to the control circuit 2. The steering angle input device 11 detects a steering angle. The outside air temperature sensor 12 detects the outside air temperature around the vehicle.

  The microcomputer constituting the control circuit 2 includes a CPU, memory (RAM, ROM, EEPROM, flash memory, etc.), I / O, and the like. When the CPU executes the program stored in the ROM (or flash memory), the control circuit 2 can perform absolute displacement indexing means, theoretical displacement indexing means, displacement difference detecting means, traveling environment information acquiring means, traveling It functions as an abnormality detection unit, a determination unit, and a warning unit.

  Now, the functions of the control circuit 2 will be described with reference to the flowchart of FIG. The control circuit 2 executes the control shown in the flowchart of FIG. 2 when the host vehicle is traveling. In step S1, the vehicle position detection data by the position detector 3 is acquired, and the absolute travel distance (absolute travel displacement) of the host vehicle is calculated from the data history (absolute displacement indexing means).

  In step S2, the rotational speed is acquired from the vehicle speed pulse input device 10, and the theoretical travel distance (theoretical travel displacement) of the host vehicle is calculated from the rotational speed and the time corresponding to the absolute travel distance ( Theoretical displacement indexing means). If the tire slips or runs idle, the theoretical mileage becomes longer than the absolute mileage.

In step S3, a travel distance difference between the absolute travel distance and the theoretical travel distance is detected (displacement difference detection means).
In step S4, the vehicle steering angle is taken from the gyroscope 13 and the absolute steering angle is calculated (absolute displacement indexing means). In step S5, a steering angle detection signal from the steering angle input device 11 is acquired, and the theoretical steering angle when the absolute steering angle becomes the reference angle is calculated (theoretical running displacement indexing means). In step S6, a steering angle difference between the absolute steering angle and the theoretical steering angle is detected (displacement difference detecting means).

  In step S7, it is determined whether or not the travel distance difference detected in step S3 and the steering angle difference detected in step S6 are each equal to or greater than a preset reference value. If so, travel is performed in step S8. An abnormality is detected (running abnormality detection means).

  In step S9, the travel environment information around the vehicle position is acquired from the information center 17 via the external information input / output device 9 (travel environment information acquisition means). In this case, the own vehicle position information acquired from the position detector 3 is transmitted to the information center 17, and the information center 17 transmits information related to the road surface condition around the own vehicle position to the control circuit 2 as traveling environment information. The information on the road surface condition (traveling road surface information) includes information such as road surface drying, road surface wetting, road surface freezing, road area snow, and the like. Of these, road surface freezing and road area snow correspond to specific information. Also, in this case, as the traveling road surface information, weather information is also acquired, and there are information such as fine weather, low rainfall, heavy rainfall, snowfall, snowstorm, etc., of which snowfall, snowstorm Corresponds to specific information.

  In step S10, it is determined whether the traveling road surface information corresponds to any one of the specific information, such as road surface freezing (road surface freezing information), road area snow (snow cover information), snowfall (snow cover information), and snowstorm (snow cover information). However, if applicable, in step S11, the occurrence of road surface condition deterioration due to any one of road surface freezing, road area snow, snowfall, and snowstorm is determined. In step S12, the display device 7 is displayed (notified) to that effect, and the speaker 8 is output (notified) with sound (warning means).

  In step S10, if the traveling road surface information does not correspond to any of the specific information of road surface freezing, snow on the road area, snowfall, or snowstorm ("NO"), the temperature detected by the outside air temperature sensor 12 in step S13 Get information. In step S14, it is determined whether or not the temperature information is road surface freezing temperature information (for example, temperature information of 2 ° C. or lower) as specific information (determination means), and if it is road surface freezing temperature information (“ YES "), the warning is executed in step S12 described above.

  In step S14, if the temperature information is not road surface freezing temperature information (“NO”), the routine proceeds to step S15 and passes through steps S1 to S10 “NO” to steps S13 to S14 “NO”. That is, it is determined whether or not the running abnormality is detected and the running environment information is not the specific information for a predetermined number of times, and if it is determined that the predetermined number of times has been continued ("YES"), in step S16, It is determined that the host vehicle condition is deteriorated, that is, tire abnormality such as large tire wear or air pressure abnormality occurs. In step S17, this is displayed (notified) on the display device 7 and voice output (notified) is performed on the speaker 8. (Warning means).

  If it is determined in step S15 that the predetermined number of times has not been continued, it is determined in step S18 that the road surface condition has deteriorated due to factors other than the traveling environment (such as sand or gravel roads in construction). Then, that effect is displayed (notified) on the display device 7, and the speaker 8 is output (notified) with sound (warning means).

  According to the present embodiment, whether or not the host vehicle slips or idles, that is, whether or not a running abnormality occurs, the travel displacement difference (travel distance difference, steering angle difference) is equal to or greater than a reference value. Can be detected. If a travel displacement abnormality is detected, travel environment information around the vehicle position (road surface information, weather information, and outside air temperature information) is acquired, and whether or not this travel environment information is specific information, Since it is judged whether the road surface condition has deteriorated or the own vehicle condition has deteriorated, grasp the actual driving environment information around the own vehicle position, such as road surface condition deterioration, tire wear, and tire abnormalities such as abnormal air pressure, etc. It is possible to accurately determine whether or not the host vehicle condition has deteriorated, and therefore, it is possible to distinguish between tire abnormality and road surface condition deterioration.

  In addition, since the determination result is output to the notification means for warning, the user can know the deterioration of the host vehicle condition such as the occurrence of tire wear, and if the deterioration of the road condition occurs, the user knows the deterioration of the road condition. be able to.

  Further, according to the present embodiment, the position detector 3 for detecting the position of the host vehicle and the external information input / output device 9 capable of communicating with the external information center 17 are provided and detected by the position detector 3. Information about road surface conditions is acquired from the information center 17 through the external information input / output device 9 as travel environment information around the vehicle position, and the information about the road surface conditions is road surface freezing information or snow cover information as specific information. The occurrence of a deterioration in the road surface condition is judged on the condition, and the occurrence of the deterioration of the own vehicle condition is judged on the condition that it is not the specific information.

  As a result, the actual road surface condition around the position of the vehicle can be recognized from the external information center 17, and when a travel abnormality such as slip or idling is detected, the travel abnormality is converted into a road surface condition such as road surface freezing or snow accumulation. It can be accurately determined whether it is caused by deterioration of the host vehicle condition such as tire wear.

  Further, according to the present embodiment, the outside temperature sensor 12 for detecting the outside temperature is provided, the temperature information detected by the outside temperature sensor 12 is acquired as the traveling environment information around the vehicle position, and the temperature information is The occurrence of deterioration of the road surface condition is determined on the condition that it is road surface freezing temperature information as the specific information, and the occurrence of deterioration of the host vehicle condition is determined on the condition that it is not the specific information. According to this, when the outside air temperature is a road surface freezing temperature when the actual outside air temperature around the vehicle position can be recognized and a running abnormality such as slip or idling is detected, the running abnormality is If the outside air temperature is not the road surface freezing temperature, it can be accurately determined that it is caused by the deterioration of the host vehicle condition such as tire wear. .

  Further, according to the present embodiment, the position detector 3 is provided, the absolute travel distance is calculated as an absolute travel displacement, and the vehicle speed pulse input device 10 which is a vehicle speed sensor is provided as the vehicle state sensor. The theoretical travel distance is calculated as the theoretical travel displacement based on the information from the vessel 10, and the travel distance difference is detected as the travel displacement difference. As a result, the travel displacement difference can be detected by the configuration including the position detector 3 and the vehicle speed pulse input device 10, and the configuration can be simplified.

  Furthermore, according to the present embodiment, in addition to the position detector 3, a gyroscope 13 is provided. Based on the gyroscope 13, an absolute steering angle is calculated as an absolute travel displacement, and a vehicle speed pulse input is used as the vehicle state sensor. In addition to the device 10, a steering angle input device 11 serving as a steering angle sensor for detecting a steering angle is provided. Based on information from the steering angle input device 11, a theoretical steering angle is calculated as a theoretical traveling displacement, and the traveling displacement is calculated. As a difference, in addition to detecting the travel distance difference, a steering angle difference is detected from the absolute steering angle and the theoretical steering angle, and the travel distance difference and the steering angle difference are not less than a reference value. It was made to detect running abnormalities.

  Thus, a steering angle difference is detected as a travel displacement difference in addition to a travel distance difference, and the travel abnormality detection means detects a travel abnormality when both the travel distance difference and the steering angle difference are equal to or greater than a reference value. Thus, it is possible to more reliably detect a running abnormality such as slip or idling, and as a result, it is possible to more reliably determine whether the road surface condition has deteriorated or the host vehicle condition has deteriorated.

  Further, according to the present embodiment, when the driving abnormality is detected and the driving environment information is not specific information continues for a predetermined number of times, it is determined that the host vehicle state has deteriorated, and unless the predetermined number of times continues, Judgment was made that the road surface condition deteriorated due to factors other than the driving environment. As a result, it is possible to detect the occurrence of road surface deterioration such as sand and gravel roads during construction in addition to road environment conditions such as road surface freezing, road area snow and road surface freezing temperature.

  The present invention is not limited to the embodiments described above or shown in the drawings, and can be implemented with various modifications. For example, the warning to the user (driver) may be performed by either display on the display device 7 or sound output by the speaker 8. Moreover, any one of the information center 17 and the outside temperature sensor 12 may be used as the information source of the traveling environment information.

1 is a functional block diagram of an electrical configuration of a vehicle running state monitoring device showing an embodiment of the present invention. Flow chart showing control contents

Explanation of symbols

In the drawings, 1 is a running state monitoring device, 2 is a control circuit (absolute displacement indexing means, theoretical displacement indexing means, displacement difference detecting means, traveling environment information acquiring means, traveling abnormality detecting means, judging means, warning means. ), 3 is a position detector (own vehicle position detection means), 7 is a display device (notification means), 8 is a speaker (notification means), 9 is an external information input / output device (communication means), and 10 is a vehicle speed pulse input device. (Vehicle speed sensor, vehicle state sensor), 11 is a steering angle input device (steering angle sensor, vehicle state sensor), 12 is an outside air temperature sensor, and 17 is an information center.

Claims (6)

Absolute displacement indexing means for determining the absolute travel displacement of the host vehicle;
Theoretical displacement indexing means for calculating the theoretical running displacement of the host vehicle from the vehicle state sensor of the host vehicle;
Notification means;
A displacement difference detecting means for detecting a difference between the absolute running displacement indexed by the absolute displacement indexing means and the theoretical running displacement indexed by the theoretical displacement indexing means;
Driving environment information acquisition means for acquiring driving environment information around the vehicle position;
A travel abnormality detection means for detecting a travel abnormality when the travel displacement difference detected by the displacement difference detection means is greater than or equal to a reference value;
When the traveling abnormality is detected by the traveling abnormality detecting means, the traveling environment information around the own vehicle position is acquired, and it is determined that the road surface condition is deteriorated on the condition that the traveling environment information is specific information, A judging means for judging the occurrence of deterioration of the host vehicle condition on the condition that it is not the specific information;
A vehicle running state monitoring device comprising: warning means for causing the notification means to output a judgment result by the judgment means. The vehicle running state monitoring device according to claim 1,
Own vehicle position detecting means for detecting the own vehicle position;
A communication means capable of communicating with an external information center,
The travel environment information acquisition means acquires information on the road surface situation from the information center as the travel environment information around the host vehicle position detected by the host vehicle position detection means via the communication means,
The determination means determines that the road surface condition deteriorates on the condition that the information on the road surface condition is road surface freezing information or snow cover information as specific information, and the deterioration of the host vehicle condition on the condition that the information is not the specific information. A running state monitoring device for a vehicle characterized by determining occurrence. The vehicle running state monitoring device according to claim 1,
It has an outside temperature sensor that detects the outside temperature,
The travel environment information acquisition means acquires temperature information detected by the outside air temperature sensor as travel environment information around the host vehicle position,
The determination means determines the occurrence of deterioration of the road surface condition on the condition that the temperature information is road surface freezing temperature information as the specific information, and determines the occurrence of deterioration of the host vehicle condition on the condition that the temperature information is not the specific information. A traveling state monitoring device for a vehicle. The vehicle running state monitoring device according to any one of claims 1 to 3,
The absolute displacement indexing means includes a vehicle position detecting means, and calculates an absolute travel distance as an absolute travel displacement,
The theoretical displacement indexing means includes a vehicle speed sensor as the vehicle state sensor, and calculates a theoretical travel distance as a theoretical travel displacement based on information from the vehicle speed sensor,
The vehicle travel state monitoring device, wherein the displacement difference detection means detects a travel distance difference as a travel displacement difference. The vehicle running state monitoring device according to claim 4,
The absolute displacement indexing means includes a gyroscope in addition to the vehicle position detecting means, and calculates an absolute steering angle as an absolute travel displacement based on the gyroscope,
The theoretical displacement indexing means includes a steering angle sensor that detects a steering angle in addition to a vehicle speed sensor as the vehicle state sensor, and calculates a theoretical steering angle as a theoretical running displacement based on the steering angle sensor. ,
The displacement difference detection means detects a steering angle difference from the absolute steering angle and the theoretical steering angle in addition to detecting the traveling distance difference as a traveling displacement difference,
The vehicle running condition monitoring device, wherein the running abnormality detecting means detects a running abnormality when the running distance difference and the steering angle difference are greater than or equal to a reference value. The vehicle travel state monitoring device according to any one of claims 1 to 5,
When the running abnormality is detected by the running abnormality detecting means and the running environment information is not specific information for a predetermined number of times, it is determined that the host vehicle state has deteriorated. A vehicle running state monitoring device, characterized in that it is determined that the road surface condition is deteriorated due to an element of the vehicle.

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