Method for maximizing microhybrid auto start-stop availability

A method of maximizing usage of start-stop operation for a vehicle equipped with a start-stop system and having an engine, a battery, and electrical components, and further having a battery management module including a processor, the method comprising:

• measuring an electric current (IL) drawn by a set of electrical components of the vehicle, from the battery;
• determining an internal resistance of the battery of the vehicle (RB), employing the battery management module, utilizing inputs from one or more temperature sensors positioned to monitor the battery temperature;
• determining a resistance of a starter motor loop circuit (RS) coupled to the engine and the battery of the vehicle, employing the battery management module, utilizing inputs from one or more temperature sensors positioned to monitor the loop circuit temperature;
• and
• calculating a closed-circuit voltage of the battery of the vehicle (VB), using the current drawn by the set of electrical component (IL), the internal resistance of the battery (RB), and the resistance of the starter motor loop circuit (RS), employing the processor;
• and
• carrying out the start-stop operation for the engine of the vehicle if the closed-circuit voltage of the battery of the vehicle is predicted to be above a pre-determined value.