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sensor system

A sensor and time slot technology, applied in the field of sensor systems, can solve problems such as cost increase and complex system structure

Active Publication Date: 2021-11-16
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the method of changing the length of the time slot as described in Patent Document 1, since the master needs to have the function of grasping the length of each time slot, the configuration of the system becomes complicated, resulting in an increase in cost.

Method used

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no. 1 approach

[0022] The first embodiment will be described. Here, an example in which the sensor system is applied to an object detection device mounted on a vehicle will be described. like figure 1 As shown, the sensor system of the present embodiment has an ECU 1 and a sensor 2 as a control unit.

[0023] The sensor 2 is an ultrasonic sensor that measures the distance to an object outside the vehicle using ultrasonic waves. The sensor 2 is wired to the ECU 1 through the wiring 3, transmits ultrasonic waves outside the vehicle according to the wave transmission instruction from the ECU 1, and receives reflected waves to measure the distance to the object. Then, the sensor 2 transmits the data of the measured distance to the ECU 1 in accordance with the data transmission instruction from the ECU 1 .

[0024] The ECU 1 is configured such that a plurality of sensors 2 can be connected. The ECU 1 and the sensor 2 are configured to communicate in a time-division multiplexed manner, and the...

no. 2 approach

[0041] A second embodiment will be described. In this embodiment, the number of sensors 2 is changed compared to the first embodiment, and the others are the same as the first embodiment, so only the parts different from the first embodiment will be described.

[0042] like Figure 4As shown, in this embodiment, as the sensor 2 , in addition to the sensor 21 and the sensor 22 , the sensor 23 , the sensor 24 , the sensor 25 , and the sensor 26 are also connected to the ECU 1 . In addition, in this embodiment, only some of the sensors 2 among the plurality of sensors 2 connected to the ECU 1 are targeted for data collection, and N2 is smaller than the number of sensors 2 connected to the ECU 1 .

[0043] Figure 4 The shaded rectangles of , indicate sensors 2 that are not set as data collection targets. That is, only the sensors 21 and 22 are targeted for data collection, and the sensors 23 to 26 are not targeted for data collection.

[0044] The reception ID and the transmi...

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Abstract

The present invention relates to a sensor system in which a sensor (2) and a control unit (1) communicate in a time-division multiplexing manner. 2) Issue a data sending instruction. When the number of sensors (2) targeted for data collection by the control unit (1) is less than the number of time slots allocated for a constant time, the sensors (2) transmit data to the control unit (1) using a plurality of time slots .

Description

technical field [0001] The present disclosure relates to sensor systems that communicate in a time-division multiplexed manner. Background technique [0002] In object detection devices mounted on vehicles, etc., data communication between the ECU and multiple sensors connected to the ECU uses PDCM (Periodic Data Collection Mode), which is one of the data collection methods in DSI3 communication. . [0003] In PDCM, the ECU acting as the master sends synchronization signals at constant intervals. Then, each sensor as a slave sends data to the ECU upon receiving a synchronization signal from the ECU. The timing of sending data after receiving the synchronization signal is different for each sensor, and data is sent sequentially from each sensor to the ECU. [0004] The interval at which the ECU transmits the synchronization signal and the number of time slots allocated to this interval are decided in consideration of the maximum number of sensors connected to the ECU. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/00G08C15/00G08C15/06G08C19/00H04J3/17
CPCG08C15/00G08C15/06G08C19/00H04Q2209/30H04Q9/00H04Q2209/75H04Q2209/753H04L12/40H04L67/12H04J3/00H04Q9/02H04Q2209/10H04Q2209/826
Inventor ι‡Žζ‘ε“δΉŸ
Owner DENSO CORP