- Battery voltage monitoring and battery condition assessment.
- Implementation of corrective actions by increasing the idle speed, as well as adjusting the voltage in the on-board network.
- Diagnostics and notification of the driver.
The condition of the battery is evaluated when the ignition is turned off and when the ignition is turned on. When the ignition is turned off, the state of charge of the battery is determined by measuring the voltage in an open circuit. The charge of the battery depends on the electrolyte concentration and the internal resistance of the battery. These parameters are indirectly determined by measuring the voltage in the car's on-board network when the car's ignition is turned off for several hours.
During engine operation, the primary determination of the state of charge of the battery is made by a battery current sensor built into the circuit.
In addition, the energy management system provides off-line battery voltage regulation, extended battery life and fuel efficiency. This is achieved by using data on the state of charge of the battery and the temperature of the electrolyte to set the charging voltage in the optimal ranges.
The charging system provides power supply to all consumers of the car and constant recharging of the battery while the engine is running. The charging system has six modes of operation:
- Battery sulfation mode.
- Charging mode.
- Fuel economy mode.
- headlight mode.
- Start mode.
- Voltage reduction mode.
The engine control unit controls the generator via a signal circuit. The engine control module monitors the performance of the generator based on signals from the duty cycle of the generator circuit. The signals are pulses with a frequency of 128 Hz and a duty cycle of 0-100%. The normal duty cycle is 5-95%. Ranges 0-5% and 95-100% are used for diagnostic purposes. The following table lists the duty cycle signals and generator output voltage values:
The alternator provides output voltage feedback signals through the duty cycle signal chain to the engine control unit. This information is then transmitted to the body control unit. The signal is a 128Hz pulse with a 0-100% duty cycle. The normal duty cycle is 5-99%. Ranges 0-5% and 100% are used for diagnostic purposes.
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