??? ilmselt tagab see parema õhuvoolu aga muus osas on see ebatöökindel ja võtab veel mootorilt jõudu ära kuna jookseb ta ju otse võlli pealt.
The electric fan has now also permanently replaced the mechanical fan as the sole main engine cooling fan on all modern era BMW cars from 2005/2006 to present.
ei tea kas ikka on nii kindel. kui paljudel e39 on kliima vent mitte töötav katkise takisti või lahti tulnud magentite tõttu?Tauri_J kirjutas: Lollikindlam ja lihtsama ehitusega.
Kuidas siis nii? Ikka lineaarselt peaks osuti liikuma vee temperatuuri suhtes.arnis kirjutas:Aga iseenesest, seier on keskel ka siis, kui vesi on 105 kraadi.
g]kusagil 120- 125 kraadi olenevalt mootoristRakz kirjutas:Mis temperatuuri siis see seier punase skaala juures olles näitab ?
Function of the characteristic map thermostat
The characteristic map thermostat is designed such that it opens (engine inlet) at a coolant temperature at the thermostat of 103C without intervention of the integrated heating system. Due to the coolant heating up in the engine, a temperature of approx. 110 C is measured at the point the coolant flows out of the engine (installation location of coolant temperature sensor for DME and instrument cluster gauge). This is the operating temperature of the engine, at which the characteristic map thermostat begins to open without control intervention.
In the event of control intervention by the DME control unit, power (12 V) is applied to the heating element integrated in the thermostat. Heating the expansion element means that the thermostat now opens at lower coolant temperatures than would be the case without the additional heating function (thermostat control range: approx. 80C - 103C).
Coolant temperature display
The instrument cluster receives the current coolant temperature from the engine control unit via the CAN bus. The "coolant temperature" information is then transferred to the body bus (K-bus ).
The "coolant temperature" information is evaluated by the instrument cluster and indicated by the coolant temperature gauge. The gauge is controlled in such a way as to provide approximately three indication ranges (cold, just right, too hot). If the pointer reaches the edge of the red warning segment, it is immediately moved to the centre of this red warning segment.
Since, after shut-down, the engine still heats the coolant for a certain period of time, an increase in the gauge temperature when the engine is stationary is prevented by a "post-heating filter" in the software of the instrument cluster. When the engine is restarted, this function detects a higher temperature than at "engine off" and indicates this "engine off" value. The current temperature is then indicated after 20 seconds with the engine running.
The warning lamp indicating excess coolant temperature is controlled by the engine control unit via the CAN bus dependent on the pointer position of the coolant temperature gauge. The "post-heating phase" for the coolant temperature warning lamp is also monitored by the engine control unit.
Ever wonder how is it that the coolant temperature on the E46 dashboard manages to stay at the same mark no matter how hot or cold the ambient temperature is, or how hard you may have been driving the car? This is because the temperature reference on the E46 models is "fake"... well, to some degree (no pun intended!). Because BMW utilizes the Characteristic Map Thermostat described above, the actual coolant temperature may vary by as much as 40 degrees under normal driving conditions. As a result, a true gauge would look somewhat erratic, which could cause an excessive number of calls to the service department. To eliminate this problem, the gauges on the E46 dashboard have been given some "intelligence". For temperatures up to 75 degrees C, the gauge displays the "real" temperature. When it displays the actual read out, the 1st notch after the blue bar indicates roughly 65 degrees C. When the coolant temperature reaches 75 degrees C, the needle is moves to the upright 12 o'clock position. The needle will remain at this position until the coolant reaches a temrperature of 113 degrees C . At this point the needle will start to move upwards, reaching the 3/4 notch at ~120 degrees C
