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Changes for page Sensor Module

Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 44.1
edited by Heimir Thordarson
on 2026/01/27 14:54
Change comment: Uploaded new attachment "Actual Representation of Linear Potmeter.png", version {1}
To version 51.1
edited by Heimir Thordarson
on 2026/01/27 17:58
Change comment: There is no comment for this version

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1 -{{wikibox title="Sensor Module" image="https://wiki.alignracing.no/bin/download/Electrical/Sensor%20Module/WebHome/ASM_AR26.png?rev=1.1" caption="3D model of the Sensor Module from Altium Designer" width="25" labelWidth="50"}}
1 +{{wikibox title="Sensor Module" image="https://wiki.alignracing.no/bin/download/Electrical/Sensor%20Module/WebHome/ASM_AR26.png?rev=1.1" caption="3D model of the Sensor Module from Altium Designer" width="30" labelWidth="50"}}
2 2  Voltage = 4.5V - 40V
3 3  Fuse Current = 125mA
4 4  Sensor Inputs = 13
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7 7  5V Pressure Inputs = 4
8 8  {{/wikibox}}
9 9  
10 +{{content}}
11 +{{content}}
12 +{{content}}
13 +{{toc reference="Electrical.Sensor Module.WebHome"/}}
14 +{{/content}}
15 +{{/content}}
16 +{{/content}}
17 +
18 += =
19 +
10 10  = Description =
11 11  
12 12  The Sensor module is designed to measure any extra analog signals rear of the firewall. For AR26, the module is designed to measure two suspension displacement sensors, two oil temperature, four water pressure, four water temperature, and one air temperature sensor. All of the measurements are then transmitted to a CAN network, which there are two of.
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115 115  * {{mathjax}}\(R\){{/mathjax}} = Resistance of the resistor in low-pass filter.
116 116  * {{mathjax}}\(C\){{/mathjax}} = Capacitance of the capacitor in the low-pass filter.
117 117  
118 -Using a resistor with 10k {{mathjax}}\(\Omega\){{/mathjax}} and a capacitor with 100 **nF **in capacitance, the cut-off frequency will be 159 **Hz.**
128 +Using a resistor with 1k {{mathjax}}\(\Omega\){{/mathjax}} and a capacitor with 100 **nF **in capacitance, the cut-off frequency will be 1592 **Hz.**
119 119  
120 120  == Suspension Displacement Sensor ==
121 121  
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125 125  
126 126  The sensor has a measurable range of 50mm with electrical range of 51mm, meaning that the electrical range will in practice be 1960 {{mathjax}}\(\Omega\){{/mathjax}} with 40 {{mathjax}}\(\Omega\){{/mathjax}} in total on each end.
127 127  
138 +[[image:Actual Representation of Linear Potmeter.png||height="195" width="309"]]
128 128  
140 +This can then be used to create the length of the sensor based on the input voltage.
129 129  
130 -
142 +(% style="font-size: 1.5em;" %)
143 +(((
144 +{{mathjax}}
145 +$$
146 +x = \frac{50}{1960} \left( \frac{2000\,V_{\text{out}}}{V_s} - 20 \right)
147 +$$
148 +{{/mathjax}}
149 +)))
150 +
151 +where:
152 +
153 +* {{mathjax}}\(x\){{/mathjax}} = The mechanical placement excluding the dead length (178mm).
154 +* {{mathjax}}\(V_s\){{/mathjax}} = The supply voltage of the linear potentiometer, in this case it is 3.3 {{mathjax}}\(V\){{/mathjax}}.
155 +* {{mathjax}}\(V_{out}\){{/mathjax}} = The output voltage of the linear potentiometer. ranging from 0.033{{mathjax}}\(V\){{/mathjax}} to 3.267{{mathjax}}\(V\){{/mathjax}}.
156 +
157 +=== Filtering ===
158 +
159 +The sensors output latency can be expected to be a lot shorter than the air temperature sensor as the sensor is just a variable sensor based on placement. The limiting factor for the system which uses this information is the CAN-BUS messages from the inverters which send the information each 6.25 milliseconds. This means that the cut-off frequency cannot be any lower than 160 Hz, which will make the same type of low pass filter from the air temperature sensor acceptable with a cut-off frequency of 1591 Hz.
160 +
161 +== Cooling Sensors ==
162 +
163 +The cooling sensors for the AR26 can is the