Estimating device and method of lead-acid storage battery level

Abstract

The invention belongs to a control technology, and particularly relates to an estimating device and a method which are used for a battery level of a battery arranged on a special vehicle. A digital single chip central processing unit (CPU) which integrates an analog to digital (AD) interface, an integrated optics (IO) interface and a serial peripheral interface (SPI), a Twin controller area network (CAN) interface and a serial port serial control interface (SCI) as a whole is adopted, thereby facilitating the expansion of the external devices. Double CAN buses of a data communication unit are mutually used as back-ups, after errors of one of the buses occur, the other of the buses works, and therefore communication reliability of the device and an upper computer is improved. The estimating device fully considers specialties of the special vehicle, adopts a modularized design concept, and is easy to maintain, low in cost, high in reliability, and easy to operate. Power up time difference between this time and last time is calculated, an initial value of electrical quantity of a storage battery can be ensured and calculated through an interpolation checking table, and a state equation and an observation equation are rapidly built in an off-line mode. A coefficient n, determined through the interpolation checking table, of a Peukert equation and battery available capacity calculated through charge discharge efficiency eta are closer to actual using battery capacity, and estimated electric quantity of a storage battery is more precise.

Description

technical field [0001] The invention belongs to control technology, and in particular relates to a device and method for estimating battery power on special vehicles. Background technique [0002] With the improvement of informatization and intelligence, batteries have the advantages of low heat generation, no noise, no pollution, and easy camouflage, and are well used in various special vehicles as a substitute for DC regulated power supplies. In order to judge whether the battery is sufficient and in good condition during use; and to avoid overcharge or overdischarge of the battery during use, to further develop the performance of the battery, improve the service life of the battery, and complete various tasks reliably , it is necessary to estimate the available power of the battery. [0003] At present, the method and device for battery power estimation are either too complicated, which increases the difficulty of design, reduces product reliability, and increases mainte...

AI Technical Summary

Problems solved by technology

[0003] At present, the method and device for battery power estimation are either too complicated, which increases the difficulty of design, reduces product reliability, and increases maintenance costs in the later period. It is difficult to be applied to special vehicles with strong mobility, such as the patent "200820111393.3 "A battery performance detection device for hybrid electric vehicles, developed a battery performance detection device for hybrid electric vehicles, through the signal acquisition unit to collect the engine starting process and battery voltage and current changes after starting, battery temperature, battery remaining, Indirectly realize the prediction of battery performance; or too simple, the detection battery parameters are single, the estimation accuracy error is large, it is difficult to meet the performance requirements, and it cannot protect the battery and prolong the life of the battery, such as the measurement of the current integral of the patent "200810114924.9" Circuit, a current integration measurement circuit is designed, which is mainly composed of a current signal processing module, an energy calculation chip module and a reference voltage source module. The current signal processing module is sampled by the sampling resistor, and then sent to the energy calculation chip module , and finally realize the current integration function through the energy calculation chip module, and finally calculate the power of the battery

The design of this circuit is simple, and because the current acquisition itself is easy to introduce errors, using the integral method alone is easy to cause cumulative errors, and the final battery power error is large, so it is difficult to meet the demand

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