Research Method of Online Calibration System Based on CCP Lithium Battery Controller

　　Author ：Iflowpower – Portable Power Station Supplier

Abstract: This article introduces a widely used * CANCALIBROTOCOL, which is based on this protocol, which is designed to be used in the online calibration system of the BatteryControlunit, BCU. The system is used to set the corresponding BCU. Parameters to achieve real-time monitoring battery status, adjust BCU and the purpose of vehicle performance.

1 Introduction In the hybrid vehicle, the battery management system is responsible for monitoring the battery status, ensuring battery safety, more importantly, real-time estimation of charge and discharge power supply, supply importance for vehicle energy distribution control strategy. Therefore, the battery management system is measured, including battery voltage, temperature, current, and estimated parameters, such as SOC, SOH, can supply and discharge power to monitor real-time, the parameters of its estimation algorithm should be based on real train test results Modify, therefore to make a real-time monitoring and online calibration in a convenient way. Traditional SCI serial communication monitoring and calibration mode is slow, the agreement is not uniform, and the expansibility is defective.

Related to the serial port-based calibration system, based on *-based calibration system has the following obvious advantages: (1) Based on the CAN bus communication, the calibration speed is fast; (2) readable and writable ECU memory is large; (3) can carry Flash Write and programming; (4) Multiple ECU calibration, testing, and diagnostics simultaneously. The author designed a *-protocol-based calibration system for the HEV power system BCU to realize online calibration and real-time monitoring. 2 * Introduction 2.

1 Establishing the * Protocol-based ECU calibration adopts the master, from communication, the main device is connected to multiple slave devices through the CAN bus, as shown in Figure 1. Where the main device measurement calibration is MCS (MeasurementCalibrationsystem), the slave device is the ECU to calibrate, here is BCU. According to the * protocol, the master device first establishes a logical connection with one of the slaves.

After establishing a logical connection, all data transfer between the main and slave is controlled by the host, and the slave is returned after the host command contains information containing information such as command response value or error code. Any slave can pass the internal data according to the list set by the host by the host through the control command. Therefore, the transmission of data is initialized by the host, executed by the slave, and is triggered by a fixed cyclic sampling frequency or event.