Bonjour, En règle générale, la temperature indiquee par la fonction cachée 7 de l'ODB oscillent entre 98 et 101'C. Je sais que le thermostat est cartographique sur le M54, mais j'aurais aime avoir vos valeurs? Sur 530i, parce que sur les mazouts il me semble que la temperature est plus basse... Un lien intéressant sur le sujet : http://www.lautomobile.ca/news/le-therm ... 28/?&er=NA Merci
Koolant avec un ''C'', en langue de Shakespeare, non ?
Tiens, j'ai trouvé ça sur la toile. Bonne lecture
E60 530i LCI Coolant temp:
Details from when the thermostat was first introduced-
"Characteristic map thermostat The thermostat is integrated in the housing of the water pump. As on the M60, a conventional thermostat with integrated vent valve is installed on the E31 with M62 engine. This thermostat opens at 85 o C. A new characteristic map-controlled thermostat is used on the vehicle series E38 and E39 with M62 engine. Function of a conventional thermostat The control of the engine cooling system with a conventional thermostat is determined by the coolant temperature only. This control system can be subdivided into three operating ranges: l Thermostat closed: The coolant only flows in the engine. The radiator circuit is closed. l Thermostat open: The entire volume of coolant flows via the radiator. This ensures the maximum cooling capacity available is utilized. l Thermostat control range: A part of the coolant volume flows via the radiator. The thermostat sets a constant engine inlet temperature within the control range. With the aid of the characteristic map thermostat, the coolant temperature can now be influenced specifically within this operating range (thermostat control range). In this way it is possible to set a higher coolant temperature in the partial load range of the engine. Higher operating temperatures in the partial load range achieve improved combustion, reflected in lower fuel consumption and pollutant emission. However, higher operating temperatures in the full load range would involve specific disadvantages (ignition timing (angle) reduction due to knocking). For this reason, lower coolant temperatures are set specifically in the full load range with the aid of the characteristic map thermostat.
BMW is thus the first automobile manufacturer worldwide to use a characteristic map-controlled thermostat for specific control of the coolant temperature in a large volume production engine. With the aid of this thermostat it is possible to specifically increase the coolant temperature in the partial load range. By increasing the coolant temperature under these engine operating conditions, it is possible to reduce fuel consumption. The characteristic map thermostat is controlled by the DME M5.2 in conjunction with a characteristic map. This characteristic map is determined by the following factors: l Engine load l Engine speed l Vehicle speed l Intake temperature l Coolant temperature Design of a characteristic map thermostat The characteristic map thermostat is an integral thermostat, i.e. the thermostat and thermostat cover make up one unit. The principle mechanical design of the characteristic map thermostat corresponds to that of a conventional thermostat. However, a heating element is additionally integrated in the expansion element (wax element).
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 103 o C without intervention of the integrated heating system. Due to the coolant heating up in the engine, a temperature of approx. 110 o 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. 80 o C - 103 o C).
Coolant temperature gauge The indicator characteristics of the coolant temperature gauge in the instrument cluster have been adapted to the higher temperature level of the engine due to the use of the characteristic map thermostat. The pointer of the coolant temperature gauge in the instrument cluster is located in the mid-position at coolant temperatures of 75 o C - 113 o C
Calimero45 a écrit:Dans la langue de Goeth, on met un "K" ;-)
Mais encore sur ce que je t'ai envoyé
Oui ça explique le fonctionnent du themostat carto. Le lien que j'ai mis est la version française. Ca confirme donc mes relevés de temperature, j'étais surpris au départ de constater des valeurs aussi élevées.