CN-121976888-A - Anti-reversion method, device, equipment and range extender of engine

CN121976888ACN 121976888 ACN121976888 ACN 121976888ACN-121976888-A

Abstract

The invention discloses an anti-reversion method, device, equipment and a range extender of an engine, wherein the method comprises the steps of obtaining hydraulic power and the actual rotating speed of the engine; when the change slope of the hydraulic power is detected to be larger than a first preset change slope and/or the actual rotation speed of the engine is reduced to be larger than the first preset rotation speed deviation, the torque control slope of the generator and the torque reduction amplitude of the generator are determined based on the rotation speed deviation, the change slope of the actual rotation speed, the hydraulic power and the change slope of the hydraulic power, and the torque of the generator is adjusted according to the torque control slope of the generator and the torque reduction amplitude. Under the working condition of rapid abrupt change of hydraulic power, the dynamic response of the engine and the generator can be coordinated, and the risks of unstable rotating speed and reverse rotation of the engine are avoided.

Inventors

ZHANG YAXIAO
ZHAO XI
XU JINYUAN
DAI ZIYANG

Assignees

潍柴动力股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. The anti-reverse rotation method of the engine is characterized by being applied to a range extender, wherein the range extender comprises the engine, a generator and a power takeoff; the anti-reverse method of the engine comprises the following steps: Acquiring the hydraulic power and the actual rotating speed of the engine; Determining a torque control slope of the generator and a torque reduction amplitude of the generator based on the rotational speed deviation, the change slope of the actual rotational speed, the hydraulic power and the change slope of the hydraulic power when it is detected that the change slope of the hydraulic power is greater than a first preset change slope and/or the actual rotational speed of the engine is reduced to a rotational speed deviation from a set rotational speed greater than a first preset rotational speed deviation; And adjusting the torque of the generator according to the torque control slope and the torque reduction amplitude of the generator.
2. The anti-reverse rotation method of an engine according to claim 1, wherein determining a torque control slope of the generator and a torque reduction amplitude of the generator based on the rotational speed deviation, a change slope of the actual rotational speed, the hydraulic power, and a change slope of the hydraulic power includes: when the change slope of the hydraulic power and/or the change slope of the actual rotating speed is in a first preset change slope range close to 0, determining that the torque control slope of the generator is in a first preset torque control slope range close to 0, wherein the first preset change slope is larger than the first preset change slope range; And when the rotating speed deviation is larger than a second preset rotating speed deviation and/or the hydraulic power is larger than a first preset hydraulic power, determining that the torque of the generator is in a first preset torque range close to 0, wherein the second preset rotating speed deviation is larger than the first preset rotating speed deviation.
3. The anti-reverse rotation method of an engine according to claim 1, wherein determining a torque control slope of the generator and a torque reduction amplitude of the generator based on the rotational speed deviation, a change slope of the actual rotational speed, the hydraulic power, and a change slope of the hydraulic power includes: Determining that the torque control slope of the generator is smaller as the change slope of the hydraulic power is larger and/or as the change slope of the actual rotational speed is smaller; the torque reduction of the generator is determined to be greater the rotational speed deviation and/or the hydraulic power.
4. The anti-reverse rotation method of an engine according to claim 1, wherein determining a torque control slope of the generator and a torque reduction amplitude of the generator based on the rotational speed deviation, the hydraulic power, and a change slope of the hydraulic power includes: Determining that the torque control slope of the generator is greater as the slope of the change in the hydraulic power is smaller and/or as the slope of the change in the actual rotational speed is greater; The torque reduction of the generator is determined to be smaller as the rotational speed deviation and/or the hydraulic power is smaller.
5. An anti-reverse device of an engine for executing the anti-reverse method of an engine according to any one of claims 1 to 4, comprising: The parameter acquisition module is used for acquiring the hydraulic power and the actual rotating speed of the engine; A torque parameter determining module configured to determine a torque control slope of the generator and a torque reduction amplitude of the generator based on a rotational speed deviation from a set rotational speed when the parameter acquiring module detects that the change slope of the hydraulic power is greater than a first preset change slope and/or the actual rotational speed of the engine is reduced to a rotational speed deviation from the set rotational speed that is greater than the first preset rotational speed deviation; And the torque adjustment module is used for adjusting the torque of the generator according to the torque control slope and the torque reduction amplitude of the generator determined by the torque parameter determination module.
6. The anti-reverse device of the engine according to claim 5, wherein the torque parameter determination module includes a torque control slope determination unit and a torque reduction magnitude determination unit; The torque control slope determining unit is used for determining that the torque control slope of the generator is in a first preset torque control slope range close to 0 when the change slope of the hydraulic power and/or the change slope of the actual rotating speed is in the first preset change slope range close to 0, wherein the first preset change slope is larger than the first preset change slope range; The torque reduction amplitude determining unit is used for determining that the torque of the generator is in a first preset torque range close to 0 when the rotation speed deviation is larger than a second preset rotation speed deviation and/or the hydraulic power is larger than a first preset hydraulic power, wherein the second preset rotation speed deviation is larger than the first preset rotation speed deviation.
7. The anti-reverse device of the engine according to claim 5, wherein the torque parameter determination module includes a torque control slope determination unit and a torque reduction magnitude determination unit; The torque control slope determination unit is used for determining that the torque control slope of the generator is smaller when the change slope of the hydraulic power is larger and/or the change slope of the actual rotating speed is smaller; The torque reduction amplitude determination unit is used for determining that the torque reduction amplitude of the generator is larger when the rotational speed deviation and/or the hydraulic power are/is larger.
8. The anti-reverse device of the engine according to claim 5, wherein the torque parameter determination module includes a torque control slope determination unit and a torque reduction magnitude determination unit; The torque control slope determination unit is used for determining that the torque control slope of the generator is larger when the change slope of the hydraulic power is smaller and/or the change slope of the actual rotating speed is larger; the torque reduction amplitude determination unit is used for determining that the torque reduction amplitude of the generator is smaller when the rotational speed deviation and/or the hydraulic power are smaller.
9. An anti-reverse device of an engine, characterized in that the anti-reverse device of an engine comprises: And a memory communicatively coupled to the at least one processor, wherein the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the anti-reverse method of the engine of any one of claims 1-4.
10. A range extender comprising the anti-reverse device of the engine of claim 9.

Description

Anti-reversion method, device, equipment and range extender of engine Technical Field The invention relates to the technical field of hybrid power engineering machinery, in particular to an anti-reversion method, an anti-reversion device, anti-reversion equipment and an anti-reversion range extender of an engine. Background Work machines employing range extenders are typically configured with Power Take-Off (PTO) devices to drive hydraulic actuators. When the system runs, the engine adopts a rotating speed control mode, the generator adopts a torque control mode, the hydraulic power of the PTO is directly controlled by a driver through a hydraulic handle, and the power of the PTO is directly output from the engine. Under such an architecture, when the hydraulic load suddenly increases substantially, the required power may exceed the torque response capability of the engine, resulting in a rapid drop in engine speed, even being towed to a below idle stop. In severe cases, the rapidly reversing generator torque may further drag the engine to reverse, causing mechanical damage to the engine hardware. To alleviate this problem, conventional control strategies typically take the higher of the target power generation rotational speed of the engine and the hydraulic power demand rotational speed as a set rotational speed, and dynamically adjust the generator torque according to the deviation of the actual rotational speed from the set rotational speed, wherein the power generation torque is reduced to reduce the load when the rotational speed deviation is large, and the power generation torque is increased to improve the power generation efficiency when the deviation is small. However, since the torque response of the generator is far faster than that of the engine, if the torque adjustment rate is too fast, the torque adjustment rate still is not matched with the dynamic response of the engine, so that the rotation speed continuously fluctuates, the control is overshot and even unstable, and the stable maintenance of the rotation speed of the engine is difficult to realize when the hydraulic power is changed severely. Therefore, the prior art lacks a high-reliability control method capable of coordinating dynamic response of the engine and the generator under the working condition of rapid abrupt change of hydraulic power and avoiding the risks of unstable rotation speed and reverse rotation of the engine, which is a technical problem to be solved in the art. Disclosure of Invention The invention provides an anti-reversion method, device, equipment and a range extender of an engine, which can coordinate dynamic response of the engine and a generator under the working condition of rapid abrupt change of hydraulic power, and avoid the risks of unstable rotating speed and reversion of the engine. In a first aspect, an embodiment of the invention provides an anti-reverse rotation method of an engine, which is suitable for a range extender, wherein the range extender comprises the engine, a generator and a power takeoff; the anti-reverse method of the engine comprises the following steps: Acquiring the hydraulic power and the actual rotating speed of the engine; Determining a torque control slope of the generator and a torque reduction amplitude of the generator based on the rotational speed deviation, the change slope of the actual rotational speed, the hydraulic power and the change slope of the hydraulic power when it is detected that the change slope of the hydraulic power is greater than a first preset change slope and/or the actual rotational speed of the engine is reduced to a rotational speed deviation from a set rotational speed greater than a first preset rotational speed deviation; And adjusting the torque of the generator according to the torque control slope and the torque reduction amplitude of the generator. Optionally, determining the torque control slope of the generator and the torque reduction amplitude of the generator based on the rotational speed deviation, the change slope of the actual rotational speed, the hydraulic power, and the change slope of the hydraulic power includes: when the change slope of the hydraulic power and/or the change slope of the actual rotating speed is in a first preset change slope range close to 0, determining that the torque control slope of the generator is in a first preset torque control slope range close to 0, wherein the first preset change slope is larger than the first preset change slope range; And when the rotating speed deviation is larger than a second preset rotating speed deviation and/or the hydraulic power is larger than a first preset hydraulic power, determining that the torque of the generator is in a first preset torque range close to 0, wherein the second preset rotating speed deviation is larger than the first preset rotating speed deviation. Optionally, determining the torque control slope of the generator and the torque reduction amplitude of th