Patent ID: 9631595
Date: 2017-04-25
CPC Classifications: F02N

Claim:
1. A method for starting an engine, comprising: determining a state of charge of a battery cell with a state of charge less than other battery cells in a battery; determining a battery power capability based on the state of charge of the battery cell with the state of charge less than other battery cells in the battery, a battery cell lower voltage limit, two internal battery resistance values, and a constant e with an exponent, the exponent based on an internal capacitance of the battery cell; determining an efficiency of a motor; looking up an engine cranking torque via indexing a function via an engine temperature; determining an engine cranking power via multiplying the engine cranking torque with engine cranking speed; multiplying the battery power capability with the efficiency of the motor and comparing a result of the multiplication to a power to crank the engine at a desired engine speed; adjusting the engine cranking speed in response to the comparison; and cranking the engine at the adjusted cranking speed.