CN-122009134-A - Hybrid power system and control method thereof

CN122009134ACN 122009134 ACN122009134 ACN 122009134ACN-122009134-A

Abstract

The application provides a hybrid power system and a control method thereof, wherein an engine is connected to an executing mechanism through a clutch, a generator motor and a pump set, and the method comprises the steps of obtaining an adjusting control mode corresponding to the hybrid power system, executing the adjusting control mode corresponding to the hybrid power system if the adjusting control mode corresponding to the hybrid power system is an intelligent mode, determining the current operation working condition of the hybrid power system according to the load demand power corresponding to an excavator, determining the target driving mode of the hybrid power system according to the current operation working condition of the hybrid power system and the charge state of an energy storage element, and controlling the state of the clutch to enable the hybrid power system to output load demand power in the target driving mode. According to the application, the coupling/decoupling between the engine and the generator motor is realized through the clutch, so that the system working mode is enriched, the system is suitable for more complex working conditions, the dependence on pure oil output is reduced, and the power output and the energy conservation are both considered.

Inventors

ZHANG JIAN
QI XINGJUN
CHI FENG
YUAN ZHONGHAO

Assignees

山东临工工程机械有限公司

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. A control method of a hybrid power system is characterized in that the hybrid power system comprises an engine, a clutch, a generator motor, an energy storage element, a pump group and an actuating mechanism, the engine is connected to the actuating mechanism through the clutch, the generator motor and the pump group, the energy storage element is connected to the generator motor, Wherein the method comprises the following steps: acquiring a corresponding regulation control mode of the hybrid power system; If the adjusting control mode corresponding to the hybrid power system is an intelligent mode, executing, namely determining the current operation working condition of the hybrid power system according to the load demand power corresponding to the excavator; determining a target driving mode of the hybrid power system according to the current operation condition of the hybrid power system and the charge state of the energy storage element; and controlling the state of the clutch to enable the hybrid power system to output the load demand power in the target driving mode.
2. The method of claim 1, wherein determining the current operating condition of the hybrid powertrain based on the corresponding load demand power of the excavator comprises: if the load demand power is smaller than the lower limit of the high-efficiency working range of the engine, determining that the current operation working condition of the hybrid power system is a light load working condition; if the load demand power is in the high-efficiency working range of the engine, determining that the current operation working condition of the hybrid power system is a medium load working condition; And if the load demand power is greater than the upper limit of the high-efficiency working range of the engine and/or the load demand power is greater than or equal to the rated power of the engine, determining that the current operation working condition of the hybrid power system is a heavy load working condition.
3. The method of claim 1, wherein determining the target drive mode of the hybrid system based on the current operating conditions of the hybrid system and the state of charge of the energy storage element comprises: in the case where the operation condition of the hybrid system is a light load condition, performing: If the state of charge of the energy storage element is in a high state of charge interval, determining that a target working mode of the hybrid power system is a pure electric mode; If the charge state of the energy storage element is in the medium charge state interval, determining that the target working mode of the hybrid power system is an electric main oil auxiliary driving mode; and if the charge state of the energy storage element is in a low charge state interval, determining a target working mode of the hybrid power system according to the working state of the whole vehicle.
4. A method according to claim 3, wherein the step of determining the target operating mode of the hybrid system based on the vehicle operating condition comprises: If the whole vehicle is in a working state, determining that a target working mode of the hybrid power system is a pure oil driving mode; and if the whole vehicle is in a non-working state, determining that the target working mode of the hybrid power system is an energy storage charging mode.
5. The method of claim 1, wherein determining the target drive mode of the hybrid system based on the current operating conditions of the hybrid system and the state of charge of the energy storage element comprises: in the case where the current operation condition of the hybrid system is a medium load condition, performing: if the charge state of the energy storage element is in a high charge state interval, determining that a target working mode of the hybrid power system is an electric main oil auxiliary driving mode; if the charge state of the energy storage element is in the medium charge state interval, determining that the target working mode of the hybrid power system is an oil main electric auxiliary driving mode; And if the charge state of the energy storage element is in the low charge state interval, determining the working state of the whole vehicle, and determining that the target working mode of the hybrid power system is an energy storage charging mode according to the state of the whole vehicle.
6. The method of claim 1, wherein determining the target drive mode of the hybrid system based on the current operating conditions of the hybrid system and the state of charge of the energy storage element comprises: And under the condition that the current operation condition of the hybrid power system is a heavy load condition, executing: If the state of charge of the energy storage element is in a high state of charge interval or a medium state of charge interval, determining that a target working mode of the hybrid power system is a combined full-output driving mode; and if the charge state of the energy storage element is in a low charge state interval, determining that the target working mode of the hybrid power system is a pure oil driving mode.
7. The method of claim 1, wherein controlling the state of the clutch to cause the hybrid system to output the load demand power in the target drive mode comprises: If the target driving mode is a pure electric driving mode, the clutch is controlled to be disconnected so as to cut off the engine and the generator motor, the engine is stopped or idled, and the generator motor is controlled to independently output load demand power to drive the pump set; and if the target driving mode is a pure oil driving mode, the clutch is controlled to be disconnected so as to cut off the engine and the generator motor, and the engine is controlled to independently output load demand power to drive the pump set.
8. The method of claim 1, wherein controlling the state of the clutch to cause the hybrid system to output the load demand power in the target drive mode further comprises: If the target driving mode is an electric main oil auxiliary driving mode, controlling the clutch to be connected, controlling the generator motor to output main power, and controlling the engine to compensate the residual power output of load required power except the main power; if the target driving mode is an energy storage charging mode, the clutch is controlled to be engaged, the engine is controlled to operate at the optimal oil consumption rotating speed, and the generator motor is driven to generate power at full power so as to charge the energy storage element; If the target driving mode is an oil main electric auxiliary driving mode, the clutch is controlled to be engaged, the engine is controlled to operate in a working efficient drive mode to output main torque, and the generator motor outputs auxiliary torque in an electric mode so that the engine and the generator motor cooperate to meet the output of load demand power; And if the target driving mode is a combined full-output driving mode, controlling the clutch to be engaged, controlling the engine to operate at rated power so as to output maximum continuous torque, and simultaneously controlling the generator motor to perform auxiliary output at peak power.
9. The method according to claim 1, wherein the method further comprises: If the adjusting control mode corresponding to the hybrid power system is a human-computer interaction mode, executing: determining a target driving mode of the hybrid power system according to a pre-recorded state of charge corresponding to the energy storage element and an operation condition corresponding to the hybrid power system; and controlling the state of the clutch to enable the hybrid power system to output the load demand power in the target driving mode.
10. A hybrid power system, characterized in that the hybrid power system comprises an engine, a clutch, a generator motor, an energy storage element, a pump group and an actuating mechanism, wherein the engine is connected to the actuating mechanism through the clutch, the generator motor and the pump group, the energy storage element is connected to the generator motor, The engine, clutch, generator motor, energy storage element, pump group are all connected to a vehicle control unit which operates the control method of the hybrid power system according to any one of claims 1-9.

Description

Hybrid power system and control method thereof Technical Field The application relates to the technical field of related control of hybrid power systems, in particular to a hybrid power system and a control method thereof. Background The existing clutch-free hybrid power system is usually coupled by adopting a mechanical structure of an engine, a transfer case, a generator motor, a pump set and an actuating mechanism, wherein the engine and the generator motor are always kept in a mechanical coupling state through the transfer case, the engine cannot independently drive the pump set, the transfer case does not have the capability of cutting off the mechanical coupling between the engine and the generator motor, and the generator motor has the dual functions of driving and generating. The existing clutch-free hybrid power system has the advantages that the structure is simple, the cost is reduced, the system response is quick, but the core disadvantages are that the degree of freedom of the working condition of an engine is limited, specifically, under the condition that the engine and a generator motor are coaxially connected through a transfer case, the engine and the generator motor are coaxial at the same speed, the rotating speed of the engine cannot be independently adjusted, when the load requirement is low, the engine cannot be separated from the generator motor to independently operate in an optimal rotating speed range, the energy-saving effect is weaker than that of a hybrid power system with a clutch, and the engine and the generator motor are always coupled, so that the working scene of the hybrid power system is limited. Disclosure of Invention In view of the above, the present application aims to provide at least a hybrid power system and a control method thereof, wherein coupling/decoupling between an engine and a generator motor is realized through a clutch, and system working modes are enriched, so that the hybrid power system can be suitable for more complex working conditions, reduce the dependence on pure oil output, and give consideration to power output and energy saving. The application mainly comprises the following aspects: In a first aspect, an embodiment of the present application provides a control method of a hybrid power system, where the hybrid power system includes an engine, a clutch, a generator motor, an energy storage element, a pump set, and an execution mechanism, the engine is connected to the execution mechanism through the clutch, the generator motor, and the pump set, and the energy storage element is connected to the generator motor, and the method includes obtaining an adjustment control mode corresponding to the hybrid power system, if the adjustment control mode corresponding to the hybrid power system is an intelligent mode, executing the adjustment control mode, determining a current operation condition of the hybrid power system according to a load demand power corresponding to an excavator, determining a target driving mode of the hybrid power system according to the current operation condition of the hybrid power system and a charge state of the energy storage element, and controlling a state of the clutch to enable the hybrid power system to output a load demand power in the target driving mode. In one possible implementation, the step of determining the current operation condition of the hybrid power system according to the load demand power corresponding to the excavator includes determining that the current operation condition of the hybrid power system is a light load condition if the load demand power is less than the lower limit of the efficient operation interval of the engine, determining that the current operation condition of the hybrid power system is a medium load condition if the load demand power is in the efficient operation interval of the engine, and determining that the current operation condition of the hybrid power system is a heavy load condition if the load demand power is greater than the upper limit of the efficient operation interval of the engine and/or the load demand power is greater than or equal to the rated power of the engine. In one possible implementation, the step of determining the target driving mode of the hybrid power system according to the current operation condition of the hybrid power system and the state of charge of the energy storage element includes executing the step of determining the target working mode of the hybrid power system as the pure electric driving mode if the state of charge of the energy storage element is in a high state of charge interval, determining the target working mode of the hybrid power system as the electric main oil auxiliary driving mode if the state of charge of the energy storage element is in a medium state of charge interval, and determining the target working mode of the hybrid power system according to the whole vehicle working state if the state of charge of the energy storag