CN-122014445-A - Power generation control method for range extender of hybrid mode diesel engine

CN122014445ACN 122014445 ACN122014445 ACN 122014445ACN-122014445-A

Abstract

The invention discloses a power generation control method of a range extender of a hybrid mode diesel engine, relates to the field of new energy power systems, and solves the technical problems that the range extender system of the existing configuration permanent magnet synchronous motor is limited by space, weight and cost and economical efficiency is insufficient due to the fact that different battery voltage platforms are selected. The control method comprises the steps of starting an engine according to the obtained discharging power and fault state of the high-voltage battery, setting constant-voltage mode activation conditions according to constant-voltage mode instructions, the running state of the engine and the grade fault of the RCU, activating the constant-voltage mode when the constant-voltage mode activation conditions meet the constant-voltage mode activation requirements, obtaining the actual voltage of the range extender after the constant-voltage mode is activated, controlling the bidirectional DCDC module to enter a discharging mode when the actual voltage of the range extender is lower than a first voltage threshold, obtaining the SOC value of the high-voltage battery, and controlling the bidirectional DCDC module to enter a charging mode when the SOC value is lower than the SOC threshold. The invention improves the economical efficiency of the range extender of the diesel engine.

Inventors

LI JUN
LI SHENGWEN
ZHANG XUEKAI
QIAN JIFU
WU TIANHUA
LIANG XINTIAN

Assignees

玉柴芯蓝新能源动力科技有限公司
中车资阳机车有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (8)

1. The power generation control method of the range extender of the diesel engine in the mixed mode is characterized in that the control method is that the discharge power and the fault state of a high-voltage battery (8) are obtained, and an engine (6) is started according to the discharge power and the fault state of the high-voltage battery (8); Acquiring a constant-voltage mode instruction, an operating state of an engine (6) and a grade fault of an RCU (3), setting a constant-voltage mode activation condition according to the constant-voltage mode instruction, the operating state of the engine (6) and the grade fault of the RCU (3), setting a constant-voltage mode activation requirement, and activating a constant-voltage mode when the constant-voltage mode activation condition meets the constant-voltage mode activation requirement; When the constant voltage mode is activated, the actual voltage of the range extender is obtained, when the actual voltage of the range extender is lower than a preset first voltage threshold value, the bidirectional DCDC module (1) is controlled to enter a discharging mode, the SOC value of the high-voltage battery (8) is obtained, and when the SOC value is lower than the preset SOC threshold value, the bidirectional DCDC module (1) is controlled to enter a charging mode.
2. The power generation control method of a hybrid mode diesel engine range extender according to claim 1, wherein the method of starting the engine (6) according to the discharge power and the failure state of the high-voltage battery (8) is, Setting a discharge power threshold, when the fault state of the high-voltage battery (8) is a fault and the discharge power is smaller than the discharge power threshold, starting the engine (6) by the RCU (3) through a low-voltage motor according to a preset starting instruction, otherwise, controlling the bidirectional DCDC module (1) to enter a discharge mode by the VCU (2), and dragging the engine (6) to start by the RCU (3) through controlling the motor (7).
3. The hybrid mode diesel range extender power generation control method according to claim 1, wherein the constant voltage mode activation conditions include whether the RCU (3) receives a constant voltage mode instruction of the VCU (2), whether the RCU (3) has a stop-rate and forced idle-rate failure, and whether the running state of the engine (6) is an idle state.
4. The power generation control method of the hybrid mode diesel range extender according to claim 2, wherein the constant voltage mode activation requirement is that the RCU (3) receives a constant voltage mode command of the VCU (2) and the RCU (3) has no stop level and forced idle level failure and the operation state of the engine (6) is an idle state.
5. The power generation control method of a hybrid mode diesel engine range extender according to claim 1, wherein after the constant voltage mode is activated, an engine warmup state, engine external characteristic data, motor external characteristic data and a fault state are obtained, a maximum allowable power generation is calibrated according to the engine warmup state, the engine external characteristic data, the motor external characteristic data and the fault state, a target rotational speed is calibrated according to the maximum allowable power generation, and an actual rotational speed of the engine is controlled according to the target rotational speed.
6. The method for controlling power generation of a range extender of a diesel engine in a hybrid mode according to claim 5, wherein the method for calibrating the target rotation speed according to the maximum allowable power generation is to obtain motor efficiency, and calibrating the target rotation speed according to the maximum allowable power generation, the engine external characteristic data and the motor efficiency.
7. The power generation control method of a hybrid mode diesel engine range extender according to claim 5, wherein a target rotation speed fluctuation interval is set, when the actual rotation speed of the engine is located in the target rotation speed fluctuation interval, the RCU (3) controls the GCU (4) to enter a constant voltage mode, and meanwhile the RCU (3) outputs a target voltage signal to the GCU (4), and the RCU (3) sends a maximum allowable power generation signal to the GCU (4).
8. The method for controlling power generation of a hybrid mode diesel engine range extender according to claim 5, wherein a loading rate of the maximum allowable power generation and an unloading rate of the maximum allowable power generation are obtained, a loading rate threshold and an unloading rate threshold are set, the loading rate is equal to the loading rate threshold when the loading rate is greater than the loading rate threshold, and the unloading rate is equal to the unloading rate threshold when the unloading rate is greater than the unloading rate threshold.

Description

Power generation control method for range extender of hybrid mode diesel engine Technical Field The invention relates to the field of new energy power systems, in particular to a power generation control method of a range extender of a hybrid mode diesel engine. Background Along with the continuous development of new energy, locomotive large-scale vehicle power systems in the field of ship electricity and the field of railways are also continuously optimized and upgraded. In the past, most of locomotives are extended to run by configuring a direct-current generator set to supplement electric energy, and compared with a permanent-magnet synchronous motor, the direct-current generator set has low power density, low efficiency and large noise, so that a range extender system configured with the permanent-magnet synchronous motor is increasingly widely applied to locomotive equipment. The matching of such equipment is limited by space, weight and cost, such as ship electricity, on one hand, the insulation requirement and the humid environment are considered, on the other hand, the battery only plays the roles of an energy buffer and a power auxiliary device, and the size and the configuration of the power battery can be switched according to the application requirements of different customers, so that the power batteries of different voltage platforms are selected. The non-uniformity of the selected battery voltage level and the master voltage level means that the range extender must output power in a constant voltage mode. In the process, when the main drive load is suddenly unloaded or disconnected, most of the energy is discharged through a discharge resistor in the market at present, but the pure consumption discharge mode is not beneficial to economy. Disclosure of Invention The invention aims to solve the technical problems of the prior art, provides a power generation control method of a range extender of a hybrid mode diesel engine, and solves the technical problems that the prior range extender discharges excessive energy in the process of outputting power in a constant voltage mode, which is not beneficial to economy. The invention relates to a power generation control method of a range extender of a hybrid mode diesel engine, which comprises the steps of obtaining the discharge power and the fault state of a high-voltage battery, and starting an engine according to the discharge power and the fault state of the high-voltage battery; Acquiring a constant voltage mode command, an operating state of an engine and a grade fault of an RCU, setting a constant voltage mode activation condition according to the constant voltage mode command, the operating state of the engine and the grade fault of the RCU, setting a constant voltage mode activation requirement, and activating a constant voltage mode when the constant voltage mode activation condition meets the constant voltage mode activation requirement; When the constant voltage mode is activated, acquiring the actual voltage of the range extender, and when the actual voltage of the range extender is lower than a preset first voltage threshold value, controlling the bidirectional DCDC module to enter a discharge mode; and acquiring an SOC value of the high-voltage battery, and controlling the bidirectional DCDC module to enter a charging mode when the SOC value is smaller than a preset SOC threshold value. Further improved, the method for starting the engine according to the discharge power and fault state of the high-voltage battery comprises the following steps of, Setting a discharging power threshold, when the fault state of the high-voltage battery is a fault and the discharging power is smaller than the discharging power threshold, starting an engine by the RCU through a low-voltage motor according to a preset starting instruction, otherwise, controlling the bidirectional DCDC module to enter a discharging mode by the VCU, and dragging the engine to start by the RCU through controlling the motor. Further, the constant voltage mode activation condition includes whether the RCU receives a constant voltage mode command of the VCU, whether the RCU has a stop-rate and forced idle-rate failure, and whether an operation state of the engine is an idle state. Further, the constant voltage mode activation requirement is that the RCU receives a constant voltage mode command of the VCU and the RCU has no stop level and forced idle level faults and the running state of the engine is an idle state. Further, the method for calibrating the target rotating speed according to the maximum allowable generated power comprises the steps of obtaining motor efficiency and calibrating the target rotating speed according to the maximum allowable generated power, the external characteristic data of the engine and the motor efficiency. Further, after the constant voltage mode is activated, an engine warmup state, engine external characteristic data, motor external characteristi