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Communication Systems

A communication system and signal technology, applied in the field of communication systems, can solve the problem of not being able to obtain any information control operation of the detection object

Active Publication Date: 2020-09-29
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this configuration, when there is an abnormality in the sending of the trigger signal and the sending of the trigger signal fails, the sensor signal will not be sent from the sensor to the microcomputer
Therefore, the microcomputer cannot obtain any information about the detected object and will not perform control operations
Failure to acquire sensor information causes more adverse effects than the cycle shift between the microcomputer's operating cycle and the sensor signal's sending cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0028] The following will refer to Figure 1 to Figure 4 A communication system according to a first embodiment of the present disclosure is described. The communication system according to the first embodiment is applied to an electric power steering apparatus equipped to a vehicle.

[0029] figure 2 The overall configuration of a steering system 100 including an electric power steering apparatus 90 is shown. figure 2 The electric power steering apparatus 90 shown in is a column assist type electric power steering apparatus. Alternatively, the electric power steering device 90 may be applied to a rack assist type electric power steering device.

[0030] The steering system 100 includes a steering wheel 91 , a steering shaft 92 , a pinion 96 , a rack shaft 97 , wheels 98 and an electric power steering device 90 .

[0031] The steering shaft 92 is connected to the steering wheel 91 . A pinion gear 96 provided at one end of the steering shaft 92 is engaged with a rack sha...

no. 2 approach

[0069] The communication system according to the second embodiment has the figure 1 Similar configuration to the first embodiment shown in . The following will refer to Figure 5 The sequence diagram shown in describes the operation of the communication system according to the second embodiment.

[0070] In a second embodiment, the start value SS and the end value SE defining the sending of the sensor signal are adjusted corresponding to the time interval between the two pulse signals (two synchronization signals). With this configuration, the transmission timing of the sensor signal can be changed.

[0071] exist Figure 5 In the example shown in , at time t2syA, the first synchronization signal SyncA is sent from the microcomputer 711, the timer 55 is reset and counts the count value from zero at time t2syA. Then, at time t2syB during count-up of the timer 55 , the second synchronization signal SyncB is transmitted from the microcomputer 711 . Based on these two synchro...

no. 3 approach

[0074] The communication system according to the third embodiment has the same figure 1 A similar configuration to the first embodiment shown in . The following will refer to Image 6 The sequence diagram shown in describes the operation of the communication system according to the third embodiment.

[0075] The microcomputer 711 is activated at time tmc after the transmission start time t1s of the first sensor signal. The transmission start time t1s is after the activation time t1o of the sensor device 501 . The microcomputer 711 continuously outputs the synchronization signal after being activated until a time point after the end time t1e of the first sensor signal. In this case, continuously outputting the synchronization signal means that the microcomputer 711 repeatedly outputs the pulse signal.

[0076] The count value of the timer 55 is reset based on the first synchronization signal Sync output after the end time t1e of the first sensor signal, and the transmission...

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PUM

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Abstract

The present invention provides a communication system comprising a sensor device (501, 504, 505) and a microcomputer (711, 714, 716), the sensor device (501, 504, 505) will include a sensor signal of detection information of a detection object Transmitted as digital signals, the microcomputers (711, 714, 716) receive the sensor signals through signal lines (Ls) and perform control operations in predetermined operation cycles based on the received sensor signals. The microcomputer sends a synchronization signal synchronized with a predetermined operation cycle of the microcomputer to the sensor device. The sensor device transmits a sensor signal at a predetermined constant cycle except when receiving a synchronization signal transmitted by the microcomputer. The sensor device changes the transmission timing of the sensor signal corresponding to the synchronization signal when receiving the synchronization signal transmitted by the microcomputer.

Description

technical field [0001] The present disclosure relates to a communication system in which a sensor sends a detection signal to a control device. Background technique [0002] In a conventional communication system in which a sensor sends a detection signal to a control device, the sensor and the control device are configured to operate according to common time information. For example, as disclosed in US2013 / 0343472 A1, the control device generates a trigger signal as a request signal and sends the trigger signal to the sensor. The sensor sends a sensor signal as a response signal to the control device in response to the request signal. [0003] A microcomputer included in the control device receives sensor signals transmitted from the sensors at predetermined transmission cycles. Here, the sensor signal is sent from the sensor as a digital signal. In the communication system, after the control device receives the sensor signal, the microcomputer performs a control operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/04H04L25/49
CPCH04L7/041H04L25/4902G05B21/02G05B2219/37532B62D5/0481B62D5/0484B62D5/0457
Inventor 铃木崇志株根秀树林胜彦小泽崇晴
Owner DENSO CORP