15 Years Factory wholesale TU-1A90 thermal wax actuator for automobile thermostat for Sao Paulo Factory
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15 Years Factory wholesale TU-1A90 thermal wax actuator for automobile thermostat for Sao Paulo Factory Detail:
1. Operation Principle
The Thermostatic Wax that has been sealed in shell body induces expansion by a given temperature, and inner rubber seal part drives its handspike to move under expansion pressure to realize a transition from thermal energy into mechanical energy. The Thermostatic Wax brings an upward movement to its handspike, and automatic control of various function are realized by use of upward movement of handspike. The return of handspike is accomplished by negative load in a given returned temperature.
2. Characteristic
(1)Small body size, occupied limited space, and its size and structure may be designed in according to the location where needs to work.
(2)Temperature control is reliable and nicety
(3)No shaking and tranquilization in working condition.
(4)The element doesn’t need special maintenance.
(5)Working life is long.
3.Main Technical Parameters
(1)Handspike’s height may be confirmed by drawing and technical parameters
(2)Handspike movement is relatives to the temperature range of the element, and the effective distance range is from 1.5mm to 20 mm.
(3)Temperature control range of thermal wax actuator is between –20 ~ 230℃.
(4)Lag phenomenon is generally 1 ~ 2℃. Friction of each component part and lag of the component part temperature cause a lag phenomenon. Because there is a difference between up and down curve of traveling distance.
(5)Loading force of thermal wax actuator is difference, it depends on its’ shell size.
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Simple demonstration of a temperature sensor. I have used an Atmel MCU to measure the temperature coming from the LM35 sensor. It outputs a voltage with a slope of 10 mV/°C.
The MCU provides an internal SAR ADC with 10-bit resolution. The Analog Reference was set by software to 2.56 V. This voltage is auto-generated by MCU so it won’t need any external reference. By this settings the ADC result will correspond to 0×004 (10-bit) for each celsius grade. The MCU allows to Left Adjust the ADC result, so you can get the 8 MSB of the 10 bit conversion. Notice that with 10-bit resolution and 2.56 V as Analog Reference you can use the 8 MSB of the result without making strange calculations, in fact each ADC unit (of the 8 MSB) corresponds to 1°C. Very good! (just make some calculations to demonstrate it).
However by taking the 8 MSB you have a resolution of 1°C. So, if you need more resolution, just consider also the 2 LSB. 2 bits correspond to 4 cases, so by considering the 2 LSB you can have a resolution of 1/4 °C. Not bad!
Finally, after a conversion of the ADC result to ASCII character, the temperature is displayed into the LCD with a refreshing rate of 1 Hz.
In future I’ll implement a clock by getting the time from the DS1307 RTC. It needs of TWI (or I2C) communication to be read/written.
-The MCU used is ATmega8535 (datasheet link: https://www.atmel.com/images/doc2502.pdf)
- The LCD Display controller is KS0070B (the logic is compatibile with Hitachi HD44780 controller)
-The Temperature Sensor used is LM35DZ (datasheet link: https://www.ti.com/lit/ds/symlink/lm35.pdf)
=== UPDATE #1 12-08-2013: ===
Get the source code!
- Source code: https://github.com/alfeale/temperature-sensor-w-lcd
My video shows how to remove the IHKA heater and AC control panel on a BMW using a 3 Series E46. This same procedure can be used for E39 5 Series and E38 7 Series with the same style heater control panel. I also go over some troubleshooting on the heater control panel. This video was made by request for a problem with only air from the center vents. I was able to re-create this symptom on my heater control panel.
