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Communication Systems

A communication system and sensor signal technology, applied in the field of communication systems, can solve problems such as the inability to correctly calculate the difference between multiple sensors

Active Publication Date: 2020-05-19
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, when the output characteristics of each sensing element have an offset error or the slopes are different from each other, the difference of multiple sensor values ​​cannot be calculated correctly

Method used

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Experimental program
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no. 1 approach

[0032] The following will refer to Figure 1A to Figure 5 A communication system according to a first embodiment of the present disclosure will be described. The communication system according to the present embodiment is applied to, for example, an electric power steering apparatus mounted to a vehicle.

[0033] figure 2 The configuration of a steering system 100 including an electric power steering device 90 is shown. figure 2 The illustrated electric power steering device 90 is a column assist electric power steering device. Alternatively, the communication system may also be applied to a rack assist electric power steering apparatus.

[0034] 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 .

[0035] A steering shaft 92 is connected to a steering wheel 91 . A pinion gear 96 disposed at an end of the steering shaft 92 meshes with a rack shaft 97 . Paired...

no. 2 approach

[0088] The following will refer to Figure 6A and Figure 6B The calculation of the sensor value difference or differential value when the slopes of the output characteristics of the sensing elements are different from each other will be described. like Figure 6A As shown, it is assumed that the slope of the sensor detection value (SENS DETCVALUE) indicated by the sensor value S1 relative to the true value is different from the slope of the sensor detection value indicated by the sensor value S2 relative to the actual value. In this case, when the microcomputer alternately receives the sensor values ​​S1 and S2 and calculates the difference, the difference calculation result is displayed by Figure 6B Fluctuates at each computation time shown by the dotted circles. When this calculation method is applied to an electric power steering device, the assist torque has a pulsating action, and this adversely affects the driver's steering experience.

[0089] The following will r...

no. 3 approach

[0111] The following will refer to Figure 8 Calculation of the processed sensor value S and the sensor value difference dS according to the third embodiment of the present disclosure will now be described. In the third embodiment, the calculation of the processed sensor value S is similar to the first embodiment. Compared with the first embodiment, in the calculation of the sensor value difference dS according to the third embodiment, only the sensor reception value from the specified sensing element is used.

[0112] exist Figure 8 In the example shown, based on the processed sensor values ​​S(n)=S1(k), S(n+2)=S1(k+1), S(n+4)=S1(k+2), etc. Use the following formula (3.1) to calculate the sensor value difference dS. In this example, only the received value S1 from the first sensing element 51 is used in the difference calculation.

[0113] dS(m)=S(n)-S(n-2) (3.1)

[0114] The processed sensor values ​​S(n+1), S(n+3), S(n+5), . . . assigned the received value S2 from the...

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Abstract

The present disclosure provides a communication system, including: a sensor device (501, 502), the sensor device (501, 502) includes a sensing element (51, 52, 61, 62) and a sending circuit (54); and a microcomputer ( 711, 712), the microcomputer (711, 712) includes a receiving circuit (72), a difference calculator (73) and a difference calculator (75). The transmission circuit compares the transmission time point of one of the sensor signals including the sensor value detected by one of the sensing elements with respect to the sensor value including the sensor value detected by the other of the sensing elements The transmission time point of the other sensor signal among the sensor signals is shifted by a predetermined period of time. The predetermined period is set shorter than the transmission cycle of the transmission circuit. The difference calculator calculates difference values ​​such that offset errors between sensing elements are compensated or fluctuations caused by changes in slopes of output characteristics of the sensing elements are reduced.

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 under common time information. For example, as disclosed in US 2013 / 0343472A1, the control device generates a trigger signal as a request signal and sends the trigger signal to the sensor. In response to the request signal, the sensor sends a sensor signal as a response signal to the control device. [0003] In US 2013 / 0343472 A1 it is considered that a trigger signal transmitted via a single signal line is branched at the receiving end and that both sensors simultaneously transmit respective sensor signals in response to the received trigger signal. With this configuration, even if two sensor values ​​are respectively acquired from two senso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L29/08
CPCH04L7/00H04L67/12B62D5/0457B62D5/0481B62D5/0484Y04S40/18B62D6/002B62D15/025H04L7/0041
Inventor 泷雅也坂井利光中村功一仓光修司小泽崇晴林胜彦
Owner DENSO CORP
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