|
|
Post by ssnjimb on Jan 25, 2023 13:59:21 GMT
Since using start stop v2 the battery voltage is in the 14v+ range
Is v1 better ?
Is that a false reading ?
|
|
|
|
Post by vwjap on Jan 25, 2023 16:30:25 GMT
One changes the temperature to say it’s not at the right temp, the other changes the voltage to say the battery is not fully charged, so basically both the same just in a different way, plus the temp way I think was stopped by VAG early on and the voltage in 2019
|
|
|
|
Post by dv52 (Australia) on Jan 25, 2023 21:48:45 GMT
As vwjap says, both what you call "V1" and "V2" do the same thing (albeit in a "different way"). Start Stop (SS) is a very sophisticated feature in that it needs to interact with multiple parts of the car's equipment (i.e. engine, brakes, transmission, electrics, air-conditioner etc). Because of this, there is an algorithm in the car that continuously monitors the state of these pieces of equipment. For SS to turn-off the engine when the car has stopped, ALL of the myriad conditions for correct operation in this algorithm MUST be satisfied. Two of these conditions are the temperature of the engine and the condition of the car's battery. The car's voltage rail is one of the measures that SS uses for battery condition. Clearly it would NOT be good for the car if SS turned-off the engine when the capacity of the battery was insufficient to be able to re-start the engine!! Both the Temperature method and the Voltage method change the threshold values that the SS algorithm uses to make the decision whether SS will turn-off the engine (or not).
- The changed value for the Temperature method is minus 50°C (the factory value is 50°C) - the changed value tells the SS algoritm not to turn-off the engine unless the temperature is below -50°C
- The changed value for the Voltage method is 12.1V (the factory value is 7.6V) - the changed value tells the SS algorithm not to turn-off the engine unless the car's "nominal voltage" is above 12.1V. Note: this "nominal voltage" is NOT the voltage across the battery terminals - it's a calculated voltage
So, implementing the Voltage method simply changes the threshold level in the memory location that the SS algoritm uses to make the GO/NO-GO decision. It does NOT change any part of the car's voltage regulation function for charging the battery!!
Don
|
|
