CN111720205A

CN111720205A - Forced cooling and lubricating protection device for supercharger

Info

Publication number: CN111720205A
Application number: CN202010290559.8A
Authority: CN
Inventors: 余超; 覃星念; 杨仕明; 叶双超
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-09-29
Anticipated expiration: 2040-04-14
Also published as: CN111720205B

Abstract

The invention provides a forced cooling and lubricating protection device for a supercharger, which comprises the supercharger, an input pipeline and an output pipeline which are respectively connected with the input end and the output end of the supercharger, and is characterized by further comprising an electronic pump and a one-way valve, wherein the electronic pump and the one-way valve are designed in parallel and are arranged on one of the input pipeline and the output pipeline, and the direction of the one-way valve is consistent with the conveying direction of the pipeline. The invention solves the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system caused by frequent starting and stopping of an engine, misoperation of a user and special application of hybrid power.

Description

Forced cooling and lubricating protection device for supercharger

Technical Field

The invention belongs to the technical field of engines, and particularly relates to a forced cooling and lubricating protection device for a supercharger.

Background

Superchargers have been widely used in engines for their effectiveness in increasing engine power, reducing fuel consumption, and improving emissions. The turbocharger is connected with the exhaust pipe when in work, and the rotating speed of the turbocharger is up to hundreds of thousands of revolutions per minute when in normal work, so that the rotating shaft and the bearing of the turbocharger must be well lubricated, and a large amount of heat inside the turbocharger is taken away from the turbocharger through the flowing of lubricating oil, thereby playing a role in protection.

For the supercharger, the traditional lubricating and cooling mode is to lubricate the supercharger of the engine through certain engine oil and engine oil pressure provided by the engine oil pump, and meanwhile, the heat is brought back to the oil pan by utilizing the flowing of the lubricating oil, so that the lubricating and cooling effects are achieved. After the engine is normally stopped, most of lubricating oil in a booster system pipeline flows back to an oil pan under the action of gravity. When the engine is normally started, the rotor system of the supercharger is fully lubricated in a mode of idling the engine for about 1 minute so as to protect the supercharger; when the engine is normally stopped, the temperature of an exhaust system is reduced in a mode that the engine runs for 3-5 minutes at idle speed, so that the temperature of a bearing is reduced, and the supercharger is protected.

The traditional supercharger lubricating mode has the following defects:

1. when the engine is started, the supercharger has oil supply delay time which is generally 5-8 s, so that great design limitation is imposed on an oil inlet system of the supercharger, and the oil supply delay time of 5-8 s is ensured if an oil inlet pipe cannot be designed to be too long; meanwhile, because the supercharger has oil supply delay time, if a user directly steps on an accelerator when starting the engine by misoperation or the hybrid power is in an oil-saving control mode, the power of the engine is directly pulled to a fuel economy point after the engine is started, so that the condition that a supercharger rotor system reaches a very high rotating speed without starting lubrication and the rotor system is dry-ground, and faults such as bearing abrasion, shaft breakage and the like occur;

2. when the engine is normally stopped, the supercharger needs to be cooled, the engine needs to idle for a long enough time, and a lot of energy is wasted;

3. if the engine is suddenly stopped due to uncertain factors, the engine oil cannot be continuously provided for the supercharger for lubrication protection at the moment, a large amount of heat accumulated at a rotating shaft and a bearing of the supercharger cannot be dissipated in time, and after the engine is stopped, an impeller of the supercharger still continuously rotates for a period of time under the condition of no engine oil due to inertia, so that the local overheating of the supercharger can be caused, the rotating shaft and the bearing of the supercharger can be burnt, and the service life of the supercharger and even the whole engine can be shortened;

4. on some engines which are frequently started and stopped, such as diesel oil and electric power hybrid engines, there is not enough time to idle and dissipate heat, and the idling mode cannot meet the requirement of effectively protecting the supercharger.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, discloses a forced cooling and lubricating protection device for a supercharger, and solves the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system caused by frequent starting and stopping of an engine, misoperation of a user and special application of hybrid power.

In order to achieve the purpose of the invention, the invention adopts the following scheme: the utility model provides a booster forced cooling lubrication protection device, includes the booster, and the input pipeline and the output pipeline of connecting booster input and output respectively, still includes electronic pump and check valve, and electronic pump and the parallel design of check valve to set up on one pipeline in input pipeline and the output pipeline, the direction and the pipeline direction of delivery of check valve are unanimous.

Further, still include engine controller ECU and temperature sensor, temperature sensor sets up on the booster bearing, engine controller ECU respectively with electronic pump and temperature sensor electric connection.

Furthermore, the electronic pump is an electronic water pump, the input end of the input pipeline is connected with a main water pump of the engine, and the output end of the output pipeline is connected with a water circulation passage of the engine.

Furthermore, the electronic pump is an electronic oil pump, the input end of the input pipeline is connected with the engine main oil pump, and the output end of the output pipeline is connected with the engine oil pan.

The invention has the advantages that:

according to the forced lubrication protection device for the supercharger, the electronic pump can be arranged at the input end of the supercharger and supplies oil/water to the supercharger; the oil pumping device can also be arranged at the output end of the supercharger to pump oil/water reversely; the check valve and the electronic pump are designed in parallel, and the check valve can realize cooling and lubrication of the supercharger without starting the electronic pump under most of the operating conditions of the engine; the electronic pump can control the rotating speed through an engine controller ECU according to the use requirement of the engine; a supercharger bearing temperature sensor is added, and the oil flow and the supercharger bearing temperature are accurately controlled through closed-loop control of an engine controller ECU according to the bearing temperature.

The invention solves the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system caused by frequent starting and stopping of an engine, misoperation of a user and special application of hybrid power, and also solves the problem of overlong oil supply/water delay time caused by overlong design of an input pipeline of a supercharger due to the layout factor of the engine. Simple structure, can reduce part quantity and cost.

Drawings

Fig. 1 is a schematic structural diagram of a forced lubrication protection device of a turbocharger according to the present invention.

Fig. 2 is another schematic structural diagram of the forced lubrication protection device for the turbocharger according to the invention.

Fig. 3 is another schematic structural diagram of the forced lubrication protection device for the turbocharger according to the invention.

Fig. 4 is a schematic diagram of a third structure of the forced lubrication protection device of the turbocharger.

In the figure, 1-supercharger, 11-input pipeline, 12-output pipeline, 13-temperature sensor, 3-electronic pump, 31-electronic oil pump, 32-electronic water pump, 4-one-way valve, 51-engine main oil pump, 52-engine main water pump, 21-oil pan, 22-engine water circulation path, and 6-engine controller ECU.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The invention provides a forced lubrication protection device of a turbocharger, and as shown in figure 1, the forced cooling lubrication protection device of the turbocharger comprises a turbocharger 1, an input pipeline 11 and an output pipeline 12 which are respectively connected with the input end and the output end of the turbocharger 1, an electronic pump 3 and a one-way valve 4, wherein the electronic pump 3 and the one-way valve 4 are designed in parallel and are arranged on the input pipeline 11, and the direction of the one-way valve 4 is consistent with the conveying direction of the pipeline. The electronic pump 3 and the non-return valve 4, which are designed in parallel, can also be arranged on the outlet line 12, as shown in fig. 3. The check valve 4 and the electronic pump 3 are designed in parallel, and the check valve 4 can realize cooling and lubrication of the supercharger under most of the operating conditions of the engine without starting the electronic pump 3; the electronic pump 3 can control the rotating speed according to the use requirement of the engine; when the engine normally runs, because the engine pump can provide a certain flow, the electronic pump 3 is not required to be started under most engine working conditions, and engine oil or water flows to the supercharger 1 from the one-way valve 4 side, so that the cooling and lubrication of the supercharger 1 can be realized; when the oil or water is not enough to cool the supercharger, the electronic pump 3 is started to provide higher flow of the oil or water; meanwhile, the design of the one-way valve 4 prevents the engine oil at the outlet of the electronic pump 3 from directly returning to the inlet of the electronic pump 3. The design reduces the running time of the electronic pump 3, prolongs the service life of the electronic pump 3, and avoids the risk of oil shortage or quick water failure of the supercharger 1 caused by the blockage of the input pipeline 11 of the supercharger 1 due to the damage of the electronic pump 3.

Example 2

On the basis of embodiment 1, as shown in fig. 1 and 2, the turbocharger further comprises an engine controller ECU6 and a temperature sensor 13, wherein the temperature sensor 13 is arranged on a bearing of the supercharger 1, and the engine controller ECU6 is electrically connected with the electronic pump 3 and the temperature sensor 13 respectively. In this embodiment, the engine controller ECU6 is configured to calculate a flow rate required by the supercharger according to the temperature of the bearing of the supercharger, and further control the rotation speed of the electronic pump 3 to achieve flow rate control, for example, when the engine is warmed up, the temperature sensor 13 detects a low temperature, the electronic pump 3 may operate at a low rotation speed, and when the engine is operated at full speed under a high load condition, the temperature sensor 13 detects a high temperature, the rotation speed of the electronic pump 5 should be increased to increase the flow rate and improve the heat dissipation efficiency.

In the case of the example 3, the following examples are given,

in addition to embodiment 2, as shown in fig. 4, the electronic pump 3 is an electronic water pump 32, the input end of the input pipeline 11 is connected to the engine main water pump 51, and the output end of the output pipeline 12 is connected to the engine water circulation passage 22.

In the present embodiment, the control strategy of the engine controller ECU6 is as follows:

s1: receiving the signal of the bearing temperature sensor 13 of the supercharger, when the temperature is higher than 180 ℃ and lower than 210 ℃, starting the electronic water pump 32, and rotating at the calibrated rotating speed of 1500 rpm; when the temperature is higher than 210 ℃, the rotation speed of the electronic water pump 32 becomes 2000 rpm.

S2: and receiving a signal of a bearing temperature sensor of the supercharger, and stopping the electronic water pump 3 after the electronic water pump continues to rotate for 0.5min at the calibrated rotating speed of 1500 rpm when the temperature is lower than 180 ℃. Returning to S1.

When the engine is stopped, the electronic water pump 32 continues to operate for a period of time to reduce the exhaust system temperature, thereby reducing the bearing temperature to achieve protection of the supercharger 1. The purpose of accurately controlling the flow of the electronic water pump 32 and the temperature of the bearing of the supercharger 1 is realized through the closed-loop control strategy according to the temperature of the bearing of the supercharger.

It should be noted that the control strategy in the present embodiment is only exemplary to give a specific temperature and rotation speed, and is not limited as the range of the temperature and the rotation speed. In practical application, the temperature of the supercharger and the rotating speed of the electronic pump are controlled based on calibration of each engine, and the related temperature and rotating speed can be reasonably adjusted according to different requirements.

In the case of the example 4, the following examples are given,

on the basis of embodiment 2, as shown in fig. 3, the electronic pump 3 is an electronic oil pump 31, the input end of the input pipeline 11 is connected to the engine main oil pump 51, and the output end of the output pipeline 12 is connected to the engine oil pan 21.

The control strategy of the engine controller ECU6 in the present embodiment is as follows:

s1: receiving a signal of a bearing temperature sensor 13 of the supercharger, and when the temperature is higher than 180 ℃ and lower than 210 ℃, starting the electronic oil pump 31 and rotating at a calibrated rotating speed of 1500 rpm; when the temperature is more than 210 ℃, the rotation speed of the electronic oil pump 31 becomes 2000 rpm.

S2: and receiving a signal of the supercharger bearing temperature sensor 13, and stopping the electronic oil pump 31 after continuously rotating for 0.5min at the calibrated rotating speed of 1500 rpm when the temperature is lower than 180 ℃. Returning to S1.

When the engine is stopped, the electronic oil pump 31 continues to operate for a period of time, reducing the exhaust system temperature, thereby reducing the bearing temperature to achieve protection of the supercharger 1. The purpose of accurately controlling the flow of the electronic oil pump 31 and the temperature of the bearing of the supercharger 1 is realized through the closed-loop control strategy according to the temperature of the bearing of the supercharger.

The control strategy in the present embodiment is only exemplary to give a specific temperature and rotation speed, and is not limited as the range of the temperature and the rotation speed. In practical application, the temperature of the supercharger and the rotating speed of the electronic pump are controlled based on calibration of each engine, and the related temperature and rotating speed can be reasonably adjusted according to different requirements.

Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be within the spirit and scope of the invention.

Claims

1. A forced cooling and lubricating protection device for a supercharger comprises the supercharger, an input pipeline and an output pipeline which are respectively connected with an input end and an output end of the supercharger, and is characterized by further comprising an electronic pump and a one-way valve, wherein the electronic pump and the one-way valve are designed in parallel and are arranged on one of the input pipeline and the output pipeline, and the direction of the one-way valve is consistent with the conveying direction of the pipeline.

2. The forced cooling lubrication protection device for the supercharger according to claim 1, wherein: still include engine controller ECU and temperature sensor, temperature sensor sets up on the booster bearing, engine controller ECU respectively with electronic pump and temperature sensor electric connection.

3. A forced cooling lubrication protection device for a supercharger according to any one of claims 1 or 2, wherein: the electronic pump is an electronic water pump, the input end of the input pipeline is connected with a main water pump of the engine, and the output end of the output pipeline is connected with a water circulation passage of the engine.

4. A forced cooling lubrication protection device for a supercharger according to any one of claims 1 or 2, wherein: the electronic pump is an electronic engine oil pump, the input end of the input pipeline is connected with an engine main engine oil pump, and the output end of the output pipeline is connected with an engine oil sump.