Compound power supply management system and method

Abstract

The invention provides a compound power supply management system and method. The compound power supply management system comprises a starter, a storage battery, a super capacitor, an engine, an electric generator and a power management unit. If the current state of a vehicle is the start state and the state-of-charge value of the storage battery is smaller than or equal to a preset state-of-chargevalue, under the condition that the voltage value of the storage battery is smaller than or equal to a first preset voltage value, the power management unit controls the storage battery and the supercapacitor to be connected in series to form a compound power supply. The compound power supply is used for starting the starter. In the compound power supply management system and method, the power management unit controls the storage battery and the super capacitor to be connected in series to form the compound power supply; due to the fact that the storage battery and the super capacitor are connected in series, when the vehicle is started, deep discharging of the storage battery can be avoided, voltage of the storage battery cannot be substantially reduced, the service life of the storagebattery is prolonged, and it is ensured that electricity utilization devices on the vehicle can normally work; and meanwhile, compared with the scheme of starting the starter by independently utilizing the super capacity, cost is low.

Description

technical field [0001] The invention relates to the field of automotive electronics, in particular to a compound power management system and method. Background technique [0002] The existing fuel vehicle technology has a 12-volt power supply system, which includes a 12-volt battery. When the car is started, the electric power stored in the battery is used to keep the starter in a working state, and the starter restarts the car engine to make the engine run at the desired temperature. It can run under the required working state to complete the starting process of the car. At the same time, the power supply system also provides electric energy for the electrical appliances on the car to ensure that the electrical appliances on the car can work normally. In addition, the power supply system may also include a 12-volt battery and a 12-volt supercapacitor connected in parallel. When starting the car, the battery or the supercapacitor alone is used to start the engine, thereby co...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a composite power management system and method to solve the problem that in the prior art, when the battery is used alone to start the engine, due to the large amount of electricity required to start the vehicle, the battery is deeply discharged, and the battery voltage is greatly reduced. Decrease, resulting in damage to the life of the battery, and the problem of dormancy or restart of the electrical appliances on the vehicle due to insufficient power supply, or the problem of high cost of the power supply system when the super capacitor is used alone to start the engine

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