Vehicle auxiliary power control system and method

Abstract

This invention proposes an auxiliary power control system and method for vehicles with auxiliary power. The auxiliary power control system includes an engine, a starter generator (ISG) connected to the engine, a battery, and a controller. The controller calculates a DC internal resistance (DCIR) of the battery based on the current voltage and current of the battery. When the DC internal resistance value is determined to be greater than a preset first threshold, the controller prohibits the starter generator from providing auxiliary power to the engine. This invention determines the battery's health based on the battery's DC internal resistance value, avoiding excessive auxiliary power from the battery that could affect the normal operation of the vehicle, and ensuring that the vehicle will not fail to start smoothly due to low battery power.

Claims

1. A vehicle auxiliary power control system, applied to a vehicle with a booster function, the vehicle auxiliary power control system comprising: an engine; a starter generator (ISG) connected to the engine; a battery electrically connected to the starter generator; a controller connected to the starter generator and the battery, continuously detecting a voltage value and a current value output by the battery, calculating a DC internal resistance value based on each measured voltage value and current value, and when the DC internal resistance value is determined to be greater than a preset internal resistance threshold, the controller prohibits the starter generator from providing auxiliary power to the engine; wherein, When the controller determines that the DC internal resistance value is greater than the preset internal resistance threshold, the controller increments a count value by 1 and determines whether the count value is greater than a counting threshold. When the count value is greater than the counting threshold, the controller prevents the vehicle's starter generator from providing auxiliary power to the engine.

2. The auxiliary power control system of the vehicle as described in claim 1, wherein, When the count value is not greater than the count threshold, the controller decrements the count value by 1, wherein the count value is not lower than a preset lower limit.

3. The auxiliary power control system for the vehicle as described in claim 1, wherein, When the vehicle is in a boost mode, the controller determines whether the current output by the battery is less than a first current threshold. If it is less than the first current threshold and has been maintained for a first time duration, the controller prohibits the starter generator from providing auxiliary power to the engine.

4. The auxiliary power control system for the vehicle as described in claim 1, wherein, When the battery is in a power recharge mode, the controller determines whether the current value output by the battery is less than a second current threshold. If it is less than the second current threshold, the controller prohibits the starter generator from providing auxiliary power to the engine.

5. The auxiliary power control system of the vehicle as described in any one of claims 1 to 4, wherein, The controller is connected to a vehicle control unit, which is connected to an instrument cluster. When the controller prevents the starter generator from providing auxiliary power to the engine, it outputs a control signal to the vehicle control unit, causing the vehicle control unit to control the instrument cluster to output a power-off message.

6. A method for auxiliary power control of a vehicle, applied to a vehicle with a boost function, the method comprising: continuously detecting a voltage value and a current value output by a battery of the vehicle; calculating a DC internal resistance value of the battery based on the measured voltage value and current value output by the battery; and determining whether the DC internal resistance value is greater than a preset internal resistance threshold, wherein, When the DC internal resistance value is greater than the preset internal resistance threshold, the starter / generator motor of the vehicle is controlled to prevent it from providing auxiliary power to the engine; wherein, the step of determining whether the DC internal resistance value is greater than the preset internal resistance threshold further includes: when it is determined that the DC internal resistance value is greater than the preset internal resistance threshold, controlling a counter value to be incremented by 1; determining whether the counter value is greater than a counting threshold; when the counter value is greater than the counting threshold, controlling the starter / generator motor of the vehicle to prevent it from providing auxiliary power to the engine.

7. The auxiliary power control method for a vehicle as described in claim 6, wherein, When the count value is not greater than the count threshold, the method further includes: controlling the count value to decrease by 1, wherein the count value is not lower than a preset lower limit value.

8. The auxiliary power control method for a vehicle as described in claim 6, wherein, When the vehicle is in a boost mode, it is determined whether the current output by the battery is less than a first current threshold. If it is less than the first current threshold and has been maintained for a first time length, the starter generator is prohibited from providing auxiliary power to the engine.

9. The auxiliary power control method for a vehicle as described in claim 6, wherein, When the battery is in a power recharge mode, it is determined whether the current value output by the battery is less than a second current threshold. If it is less than the second current threshold, the starter generator is prohibited from providing auxiliary power to the engine.

10. The auxiliary power control method for a vehicle as described in any one of claims 6 to 9, wherein, When the starter-generator motor is prohibited from providing auxiliary power to the engine, it further includes: controlling an instrument output of the vehicle to display a message prohibiting boost.

Images