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Changes for page Sensor Module

Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 63.1
edited by Heimir Thordarson
on 2026/02/23 18:01
Change comment: There is no comment for this version
To version 66.1
edited by Heimir Thordarson
on 2026/03/24 14:26
Change comment: There is no comment for this version

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... ... @@ -68,6 +68,8 @@
68 68  
69 69  == Microcontroller Pinout ==
70 70  
71 +The sensor module uses a microcontroller to measure and calculate the values for the analog signals. The microcontroller used in this system is the [[STM32G491RET6>>doc:.https\:www\.st\.comenmicrocontrollers-microprocessorsstm32g491re\.html.WebHome]]
72 +
71 71  (% style="width:793.6px" %)
72 72  |=(% style="width: 96px;" %)Physical Pin|=(% style="width: 102px;" %)Electrical Pin|=(% style="width: 593px;" %)Description
73 73  |(% style="width:96px" %)1|(% style="width:102px" %)VBAT|(% style="width:593px" %)Power source from a backup battery if a RTC would be used (Connected to +3V3 in this case)
... ... @@ -194,9 +194,9 @@
194 194  
195 195  where:
196 196  
197 -* {{mathjax}}\(x\){{/mathjax}} = The mechanical placement excluding the dead length (178mm).
199 +* {{mathjax}}\(x\){{/mathjax}}= The mechanical placement excluding the dead length (178mm).
198 198  * {{mathjax}}\(V_s\){{/mathjax}}= The supply voltage of the linear potentiometer, in this case it is 3.3 {{mathjax}}\(V\){{/mathjax}}.
199 -* {{mathjax}}\(V_{out}\){{/mathjax}} = The output voltage of the linear potentiometer. ranging from 0.033{{mathjax}}\(V\){{/mathjax}} to 3.267{{mathjax}}\(V\){{/mathjax}}.
201 +* {{mathjax}}\(V_{out}\){{/mathjax}}= The output voltage of the linear potentiometer. ranging from 0.033{{mathjax}}\(V\){{/mathjax}} to 3.267{{mathjax}}\(V\){{/mathjax}}.
200 200  
201 201  === Filtering ===
202 202  
... ... @@ -248,6 +248,32 @@
248 248  
249 249  The sensors output latency can be expected to be a lot shorter than the oil 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 oil temperature sensor acceptable with a cut-off frequency of 1591 Hz.
250 250  
253 +== Cooling System Sensor ==
254 +
255 +There will be four cooling system sensor on the AR26 vehicle, and all of the sensors include two measurements each. These two signals are water temperature and pressure. With this the temperature delta over the entire cooling system can be measured, but also the overall water flow. If the equivalent orifice of the motors, inverters and other components are known, the flow can be calculated using the orifice equation.
256 +
257 +
258 +(% style="font-size: 1.5em;" %)
259 +(((
260 +{{mathjax}}
261 +$$
262 +Q = C_D \cdot A_D \sqrt{\frac{2 \cdot \Delta P}{\rho}}
263 +$$
264 +{{/mathjax}}
265 +)))
266 +
267 +
268 +where:
269 +
270 +* {{mathjax}}\(Q\){{/mathjax}} = Waterflow through the equivalent orifice
271 +* {{mathjax}}\(C_D \cdot A_D\){{/mathjax}} = practical cross section of the orifice
272 +* {{mathjax}}\(\Delta P\){{/mathjax}} = Pressure difference between the two pressure sensors
273 +* {{mathjax}}\(\rho\){{/mathjax}} = Density of the cooling liquid
274 +
275 +
276 +
277 +
278 +
251 251  = Bill of Materials =
252 252  
253 253  == Circuit Board ==