CN115199402A

CN115199402A - Turbocharging system, temperature control method, turbocharger and control method thereof

Info

Publication number: CN115199402A
Application number: CN202210706464.9A
Authority: CN
Inventors: 单文强; 查乃敏; 丁伟; 向飞; 向高
Original assignee: Dongfeng Motor Group Co Ltd
Current assignee: Dongfeng Motor Group Co Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-10-18

Abstract

The embodiment of the application provides a turbocharging system, a temperature control method, a turbocharger and a control method thereof. The turbocharger includes: power conversion device, turbine subassembly and pinch roller subassembly. The power conversion device comprises a power machine and a rotating shaft in driving connection with the power machine. The power machine has a power generation state for converting kinetic energy of the rotating shaft into electric energy and a driving state for converting the electric energy into kinetic energy of the rotating shaft. When the engine is in an initial starting state, the power machine is in a driving state of converting electric energy into kinetic energy, and the rotating speed of the rotating shaft is driven to be increased. The improvement of the rotating speed of the rotating shaft increases the air pressure input into the engine from the air outlet cavity under the driving of the rotating shaft by the pinch roller assembly, and improves the power output responsiveness of the engine. When the engine runs to a stable working state, the power conversion device is in a power generation state for converting the kinetic energy of the rotating shaft into electric energy so as to supply power to other electric equipment, and energy is saved.

Description

Turbocharging system, temperature control method, turbocharger and control method thereof

Technical Field

The invention belongs to the field of automobile engines, and particularly relates to a turbocharging system, a temperature control method, a turbocharger and a control method thereof.

Background

In the related art, the turbocharger utilizes the inertia impulse force of the exhaust gas discharged by the engine to push a turbine in a turbine chamber, the turbine drives a coaxial pressure roller, and the pressure roller presses and conveys air to enable the air to be pressurized and enter an air cylinder. When the rotating speed of the engine is increased, the exhaust gas discharge speed and the rotating speed of the turbine are also increased synchronously, the pinch roller compresses more air to enter the air cylinder, the pressure and the density of the air are increased, more fuel can be combusted, and the output power of the engine can be increased. However, at the initial start of the engine, there is a turbo lag.

Disclosure of Invention

In view of the above, embodiments of the present application are expected to provide a turbocharger system, a temperature control method, and a turbocharger and a control method thereof, which have better cold start power responsiveness and higher thermal efficiency.

The embodiment of the application provides a turbocharger for promoting the output power of engine, include:

the power conversion device comprises a power machine and a rotating shaft in driving connection with the power machine, the power machine is provided with a power generation state for converting kinetic energy of the rotating shaft into electric energy and a driving state for converting the electric energy into the kinetic energy of the rotating shaft, and the power machine can be switched between the power generation state and the driving state;

the turbine assembly is connected to one end of the rotating shaft and is provided with a receiving cavity which is used for receiving exhaust gas of an engine so as to drive the rotating shaft to rotate; and

the pinch roller assembly is connected at the other end of the rotating shaft and provided with an air outlet cavity, and the pinch roller assembly is driven by the rotating shaft to input air in the air outlet cavity into the engine.

In some embodiments, the turbocharger further includes a pressure relief valve disposed in the pressure wheel assembly, the pressure wheel assembly has a gas bypass channel, the pressure relief valve is configured to open or close the gas bypass channel, and the pressure relief valve opens the gas bypass channel to enable the gas outlet cavity to be relieved of pressure through the gas bypass channel.

In some embodiments, the turbocharger further includes a filter pack, the puck assembly including:

the pinch roller body is connected with the rotating shaft; and

the utility model provides a pressure release valve, including the pinch roller body, the pinch roller body is located in the first casing, first casing with the pinch roller body encloses and establishes into the chamber of admitting air with go out the chamber, the pinch roller body be used for with the air current in the chamber of admitting air carry to go out the chamber so that gaseous warp go out the chamber and get into the engine, the pressure in the chamber of going out is greater than the pressure in the chamber of admitting air, it establishes ties to filter the piece the upper reaches in the chamber of admitting air, gas bypass passageway form in first casing works as the relief valve is opened gas bypass passageway, the chamber of admitting air with go out the chamber of going out the gas bypass passageway intercommunication.

In some embodiments, the turbocharger further comprises an exhaust bypass valve disposed in the turbine assembly, the bypass valve being configured to open or close the receiving cavity, the exhaust bypass valve opening the receiving cavity to allow the receiving cavity to be vented.

In some embodiments, the power conversion device further includes a second housing, the power machine is located in the second housing, the rotating shaft is disposed through the second housing, and the second housing is formed with a cooling channel for receiving a cooling liquid to cool the power machine.

The embodiment of the application provides a control method of the turbocharger, which comprises the following steps:

acquiring the pressure of the air outlet cavity;

and when the pressure of the air outlet cavity is smaller than the preset pressure, the state of the power machine is switched to the driving state.

In some embodiments, the control method further comprises: and when the pressure of the air outlet cavity is greater than the preset pressure, the state of the power machine is switched to the power generation state.

In some embodiments, the turbocharger further comprises a pressure relief valve disposed on the pinch roller assembly, the pinch roller assembly having a gas bypass channel, the pressure relief valve being configured to open or close the gas bypass channel, the pressure relief valve opening the gas bypass channel to relieve pressure in the gas outlet cavity through the gas bypass channel;

the control method further comprises the following steps: when the pressure of the air outlet cavity is larger than the preset pressure, the power machine is in a power generation state, the opening degree of the pressure release valve is smaller than the opening degree in a fully-opened state, and the opening degree of the pressure release valve is increased until the pressure of the air outlet cavity is smaller than the preset pressure or until the opening degree of the pressure release valve is equal to the opening degree in the fully-opened state.

In some embodiments, the turbocharger further comprises an exhaust bypass valve provided to the turbine assembly, the exhaust bypass valve being configured to open or close the receiving cavity, the exhaust bypass valve opening the receiving cavity to allow the receiving cavity to be vented;

the control method further comprises the following steps: when the pressure of the air outlet cavity is larger than the preset pressure, the power machine is in a power generation state, the opening degree of the pressure release valve is equal to the opening degree in a fully open state, and the opening degree of the exhaust bypass valve is increased until the pressure of the air outlet cavity is smaller than the preset pressure.

The embodiment of the present application further provides a turbocharging system, including:

in the turbocharger described in the foregoing embodiment, the power conversion device further includes a second housing, the power machine is located in the second housing, the rotating shaft is inserted into the second housing, and the second housing is formed with a cooling channel for receiving a cooling liquid to cool the power machine; and

a cooling assembly in series with the cooling flow channel to provide a cooling fluid to the cooling flow channel.

In some embodiments, the turbocharger system further comprises a flow regulating valve and an intercooler, the intercooler is connected in parallel with the cooling flow passage, the flow regulating valve is connected in series with the cooling flow passage and the intercooler respectively, the cooling liquid flows to the cooling flow passage and the intercooler respectively through the flow regulating valve, the intercooler is used for cooling the gas flowing from the gas outlet cavity to the engine, and the cooling assembly is connected in series with the turbocharger and the intercooler respectively.

The embodiment of the application provides a temperature control method for the turbocharging system, which comprises the following steps:

when the temperature of the cooling liquid in the cooling assembly is higher than a first preset temperature, the cooling capacity of the cooling assembly is improved;

and when the temperature of the cooling liquid in the cooling flow channel is higher than a second preset temperature, adjusting the flow regulating valve to increase the flow of the cooling liquid in the cooling flow channel, and stopping adjusting the flow regulating valve until the temperature of the cooling liquid is lower than the second preset temperature.

The turbocharger of the embodiment of the application is provided with the power machine which can be switched between a power generation state and a driving state. When the engine is in an initial starting state, the power machine is in a driving state of converting electric energy into kinetic energy, and the rotating speed of the rotating shaft is driven to be increased. The improvement of the rotating speed of the rotating shaft enables the air pressure input into the engine from the air outlet cavity by the pinch roller assembly under the driving of the rotating shaft to be increased, and the power output responsiveness of the engine is improved. When the engine runs to a stable working state, the power conversion device is in a power generation state of converting kinetic energy of the rotating shaft into electric energy so as to supply power to other electric equipment, and energy is saved.

Drawings

FIG. 1 is a schematic view of a turbocharger according to an embodiment of the present application;

FIG. 2 is a schematic view of the pressure wheel assembly 4 and pressure relief valve 7 of FIG. 1, wherein the pressure relief valve 7 closes the gas bypass passage;

FIG. 3 is a schematic view of the pressure wheel assembly 4 and the pressure relief valve 7 of FIG. 1, wherein the pressure relief valve 7 opens a gas bypass passage;

FIG. 4 is a schematic diagram of a control method for a turbocharger according to an embodiment of the present application;

FIG. 5 is a schematic view of a turbocharger system according to an embodiment of the present application.

Description of the reference numerals

A power conversion device 1; a power machine 11; a rotating shaft 12; a pinch roller assembly 4; a puck body 41; a first housing 42; an air intake chamber 43; an outlet chamber 44; a turbine assembly 5; a turbine 51; a scroll 52; a second housing 6; a pressure relief valve 7.

Detailed Description

It should be noted that the embodiments and technical features of the embodiments in the present application may be combined with each other without conflict, and the detailed description in the detailed description should be understood as an explanation of the gist of the present application and should not be construed as an undue limitation to the present application.

In the related art, exhaust gas generated from an engine rotates a turbine in a turbocharger. In the initial starting stage of the engine, due to inertia of the turbine and large resistance between the turbine and the mounting shaft, when exhaust gas is suddenly increased, the rotating speed of the turbine cannot be instantly increased at the same time, and the phenomenon of motion delay of the turbine exists.

To this end, the embodiment of the invention provides a turbocharger for increasing the output power of an engine. Referring to fig. 1, a turbocharger includes: power conversion device 1, turbine assembly 5 and pinch roller assembly 4. The power conversion device 1 includes a power machine 11 and a rotating shaft 12 drivingly connected to the power machine 11. The power machine 11 has a power generation state for converting the kinetic energy of the rotating shaft 12 into electric energy and a driving state for converting the electric energy into the kinetic energy of the rotating shaft 12, i.e., the power machine 11 can be switched between the power generation state and the driving state.

In one embodiment, referring to FIG. 1, turbine assembly 5 is coupled to an end of a shaft 12. The turbine assembly 5 has a receiving cavity for receiving exhaust gas from the engine and driving the rotation of the shaft 12.

In one embodiment, referring to fig. 1, the turbine assembly 5 includes a volute 52 and a turbine 51 disposed in the volute 52, wherein the turbine 51 is connected to one end of the shaft 12. The receiving cavity of the turbine assembly 5 is enclosed by a volute 52, the volute 52 is wrapped around the turbine 51 to store the exhaust gas generated by the engine after doing work, and the exhaust gas discharged by the engine drives the turbine 51 to rotate.

And the pinch roller assembly 4 is connected to the other end of the rotating shaft 12, the pinch roller assembly 4 is provided with an air outlet cavity 44, and the air in the air outlet cavity 44 is input into the engine by the pinch roller assembly 4 under the driving of the rotating shaft 12.

The turbocharger of the embodiment of the application is provided with the power machine 11 which can be switched between a power generation state and a driving state. When the engine is in an initial starting state, the power machine 11 is in a driving state of converting electric energy into kinetic energy, and the rotating speed of the rotating shaft 12 is driven and increased. The increase of the rotating speed of the rotating shaft 12 increases the air pressure input into the engine from the air outlet cavity 44 by the pinch roller assembly 4 driven by the rotating shaft 12, and improves the power output responsiveness of the engine. When the engine runs to a stable working state, the power conversion device 1 is in a power generation state of converting the kinetic energy of the rotating shaft 12 into electric energy so as to supply power to other electric equipment, and energy is saved.

In one embodiment, puck assembly 4 has an air bypass channel.

In one embodiment, referring to fig. 1, puck assembly 4 includes a first housing 42 and a puck body 41 positioned within first housing 42, puck body 41 being connected to the other end of spindle 12.

It should be noted that the turbine 51 drives the pressure wheel body 41 to rotate through the rotating shaft 12, and the rotating speed of the pressure wheel body 41 is proportional to the rotating speed of the rotating shaft 12.

In one embodiment, an ECU (Electronic Control Unit) reads the pressure of the air outlet chamber 44, and controls the power machine 11 to switch between the power generation state and the driving state according to the comparison between the pressure of the air outlet chamber 44 and a preset pressure.

Illustratively, puck assembly 4 includes: a pressure wheel body 41 connected with the rotating shaft 12 and a first shell 42. Puck body 41 is located in first shell 42, and first shell 42 and puck body 41 enclose an inlet cavity 43 and an outlet cavity 44. The first housing 42 is formed with a gas bypass passage.

The pinch roller body 41 is used for conveying airflow of the air inlet cavity 43 to the air outlet cavity 44 so that the airflow enters the engine through the air outlet cavity 44, and the pressure of the air outlet cavity 44 is greater than that of the air inlet cavity 43.

In this embodiment, the gas bypass channel allows the gas acting through the pressure wheel body 41 to return to the gas inlet chamber 43, which effectively regulates the pressure at the side of the gas outlet chamber 44.

For example, referring to fig. 2 and 3, the turbocharger further includes a pressure relief valve 7 disposed on the pressure wheel assembly 4, and the pressure relief valve 7 is used for opening or closing the gas bypass passage. When the pressure relief valve 7 opens the gas bypass passage, the gas outlet chamber 44 is relieved of pressure through the gas bypass passage.

In this embodiment, when the pressure of the air outlet cavity 44 is greater than the preset pressure, referring to fig. 3, the pressure relief valve 7 opens the gas bypass channel, that is, the gas bypass channel connects the air inlet cavity 43 and the air outlet cavity 44. The pressure in the outlet chamber 44 is reduced, reducing the risk of engine knock due to too high boost pressure.

The type of the pressure relief valve 7 is not limited, and in some embodiments, the pressure relief valve 7 is an electronic pressure relief valve 7, and the opening and closing of the electronic pressure relief valve 7 is controlled by an ECU-operated solenoid. The ECU will judge according to the pressure level that the air outlet chamber 44 pressurizes, when pressure exceeds the preset pressure, carry out the circular telegram control to the solenoid to open electron relief valve 7.

In some embodiments, the turbocharger further includes a filter element for filtering contaminants in the air to prevent contaminants in the air from damaging puck assembly 4 during operation of the turbocharger.

In some embodiments, the filter element is in series upstream of the inlet chamber 43. That is, after passing through the filter element, the air enters the air inlet cavity 43 of the pinch roller assembly 4, and after passing through the action of the pinch roller body 41, the air enters the air outlet cavity 44. After the pressure relief valve 7 is opened, the air acted on by the pressure wheel body 41 is not directly discharged to the outside, but is returned to the air inlet cavity 43 downstream of the filter element, so as to avoid waste of the filtered air.

The turbocharger further illustratively includes an wastegate valve provided to the turbine assembly 5 for opening or closing the receiving chamber, the wastegate valve opening the receiving chamber to vent the receiving chamber.

In this embodiment, the wastegate valve opens the receiving cavity, so that part of the exhaust gas discharged from the engine is directly discharged to the outside of the receiving cavity without passing through the turbine 51, which directly reduces the flow rate of the exhaust gas blowing the turbine 51, reduces the rotation speed of the turbine 51, and then reduces the rotation speeds of the rotating shaft 12 and the pinch roller body 41, reduces the pressure of the gas outlet cavity 44, and finally reduces the boost value of the turbocharger.

It should be noted that, because the rotation speed of the rotating shaft 12 is high during the operation of the turbocharger, and the power machine 11 and the rotating shaft 12 generate a large amount of heat during high-speed operation, a corresponding cooling device needs to be provided to dissipate heat of the power machine 11 and the rotating shaft 12.

Illustratively, the power conversion device 1 further includes a second housing 6, the power machine 11 is located in the second housing 6, the rotating shaft 12 is disposed through the second housing 6, and the second housing 6 is formed with a cooling channel for receiving a cooling liquid to cool the power machine 11.

In this embodiment, the coolant flowing through the cooling flow path can carry away heat from the power machine 11 and the rotating shaft 12, thereby improving the reliability of the power conversion device 1.

The material of the second casing 6 is not limited, and in some embodiments, the second casing 6 may be made of HT200 (gray cast iron grade, with a minimum tensile strength of 200 MPa), QT600-3 (nodular cast iron, with a minimum tensile strength of 600 MPa), or the like.

In one embodiment, the second housing 6 is formed by integral casting. In this way, the second housing 6 has a better strength.

An embodiment of the present application provides a control method of the turbocharger, please refer to fig. 4, including:

s1: the pressure of the outlet chamber 44 is obtained.

S2: when the pressure in the outlet chamber 44 is less than the predetermined pressure, the state of the power machine 11 is switched to the driving state.

In this embodiment, the ECU reads the pressure in the air chamber 44 and determines that the pressure in the air chamber 44 is less than the predetermined pressure, and controls the power machine 11 to switch the state to the driving state. In the cold starting stage of the engine, the power machine 11 provides additional power to drive the rotating shaft 12 to rotate rapidly, so that the rotation of the pinch roller body 41 is accelerated, the air is pressurized rapidly by the pinch roller body 41, and the power output responsiveness of the engine is improved.

In one embodiment, the preset pressure may be a pressure corresponding to an intake air amount at which the engine normally operates.

In one embodiment, referring to FIG. 4, when the power machine 11 is in a drive state, the pressure relief valve 7 and the wastegate valve are in a closed state.

For example, referring to fig. 4, the control method further includes: when the pressure of the air outlet cavity 44 is greater than the preset pressure, the state of the power machine 11 is switched to the power generation state.

In this embodiment, when the pressure in the outlet chamber 44 is higher than the predetermined pressure, no additional power is required to rotate the accelerating rotor 12 because the inlet chamber 43 does not need to provide more air. At the moment, the ECU switches the state of the power machine 11 to a power generation state to supply power to other electric equipment, so that energy is saved.

In one embodiment, when the engine is operating to a steady state operating condition, the inlet chamber 43 need not be further supplied with a large amount of gas, and the outlet chamber 44 may be at a pressure greater than the predetermined pressure.

In one embodiment, when the vehicle or the engine is decelerating, the pressure roller assembly 4 continues to increase the air pressure in the air outlet chamber 44 under the inertia effect, and the pressure in the air outlet chamber 44 may be higher than the preset pressure.

In an embodiment, referring to fig. 4, when the power machine 11 is in a power generation state, the pressure of the air outlet chamber 44 is less than a preset pressure, and the pressure relief valve 7 and the wastegate valve are in a closed state.

For example, referring to fig. 4, the control method further includes: when the pressure of the air outlet cavity 44 is greater than the preset pressure, the state of the power machine 11 is a power generation state, the opening degree of the pressure release valve 7 is smaller than the opening degree in a fully open state, and the opening degree of the pressure release valve 7 is increased until the pressure of the air outlet cavity 44 is smaller than the preset pressure or until the opening degree of the pressure release valve 7 is equal to the opening degree in the fully open state.

In this embodiment, along with the improvement of the rotating speed of the rotating shaft 12 and the rotating speed of the pinch roller body 41, the pinch roller body 41 continuously applies work to the air, and when the pressure of the air outlet cavity 44 is greater than the preset pressure, the ECU controls to open the pressure release valve 7, so that the air bypass channel is conducted, and the pressure release of the air outlet cavity 44 is realized.

It should be noted that the process of controlling the opening of the pressure release valve 7 by the ECU is a dynamic control process, that is, in the process of opening the pressure release valve 7 by the ECU, the pressure of the gas outlet cavity 44 needs to be constantly compared with the preset pressure, and when the pressure of the gas outlet cavity 44 is smaller than or equal to the preset pressure, the ECU controls to stop opening the pressure release valve 7; when the pressure of the air outlet cavity 44 is greater than the preset pressure, the ECU controls to continue opening the relief valve 7 until the relief valve 7 is at the opening degree in the fully open state.

In one embodiment, when the opening degree of the relief valve 7 is smaller than the opening degree in the fully open state, the wastegate valve is in the closed state.

Illustratively, when the pressure of the air outlet cavity 44 is greater than the preset pressure, the state of the power machine 11 is a power generation state, the opening degree of the pressure relief valve 7 is equal to the opening degree in the full-open state, and the opening degree of the exhaust bypass valve is increased until the pressure of the air outlet cavity 44 is less than the preset pressure.

In one embodiment, the predetermined pressure is a lower limit of the pressure at which the gas in the gas outlet chamber 44 is supplied to the engine under normal operating conditions.

In this embodiment, when the relief valve 7 is fully opened and the pressure in the air outlet cavity 44 is still greater than the preset pressure, in order to further reduce the pressure in the air outlet cavity 44, the ECU controls to open the wastegate valve to reduce the amount of exhaust gas driving the turbine 51 to rotate, and as the rotation speed of the turbine 51 decreases, the power of the pinch roller body 41 for compressing air decreases, so as to achieve the purpose of reducing the pressure in the air outlet cavity 44 in the pinch roller assembly 4.

It should be noted that the process of the ECU controlling to open the wastegate valve is a dynamic control process, that is, the ECU needs to compare the pressure in the scroll 52 with the preset pressure at any time during the process of opening the wastegate valve, and when the pressure in the scroll 52 is less than or equal to the preset pressure, the ECU controls to stop opening the wastegate valve; when the pressure of the air outlet chamber 44 is greater than the preset pressure, the ECU controls to continue opening the exhaust bypass valve until the exhaust bypass valve is at the opening degree in the fully open state.

In one embodiment, the wastegate valve is kept closed when the relief valve 7 is not fully opened. To ensure that the exhaust gas in the volute 52 drives the turbine 51 to rotate, avoiding waste of energy of the exhaust gas. The rotating speed of the pressure wheel assembly 4 in the turbocharger is guaranteed by the design mode, and when the turbocharger needs rapid pressurization, only the pressure release valve 7 needs to be closed, and sufficient air can be guaranteed to be supplied to the engine.

It should be noted that, since the pressure of the air outlet chamber 44 is greater than the preset pressure, the power machine 11 should be in the power generation state.

The embodiment of the application provides a turbocharging system. The turbocharger system includes a turbocharger and a cooling assembly. The cooling assembly is connected with the cooling flow channel in series to provide cooling liquid for the cooling flow channel. In such a structure, the cooling component supplies flowing cooling liquid to the cooling flow channel, so that heat of the power machine 11 and the rotating shaft 12 can be taken away, and the reliability of the power conversion device 1 is improved.

In some embodiments, referring to fig. 5, the cooling assembly includes a water pump, a heat sink, and a cooling fan. The water pump is used for driving the cooling liquid in the cooling flow channel to flow. After the cooling liquid flows into the radiator, the contact area of the cooling liquid and air is increased due to the fact that the area of the radiator relative to the cooling flow channel is large, and cooling of the cooling liquid is facilitated. The cooling fan is used to increase the flow rate and quantity of air flowing through the radiator to enhance the heat dissipation capacity of the radiator.

Illustratively, referring to FIG. 5, the turbocharging system further includes a flow regulating valve and an intercooler. The intercooler is connected in parallel with the cooling flow passage, the flow regulating valve is connected in series with the cooling flow passage and the intercooler respectively, the cooling liquid flows to the cooling flow passage and the intercooler respectively through the flow regulating valve, the intercooler is used for cooling the gas flowing to the engine from the gas outlet cavity 44, and the cooling assembly is connected in series with the turbocharger and the intercooler respectively. According to the structure, the cooling assembly for cooling the intercooler is used for supplying the cooling liquid to the cooling flow channel, no additional equipment for cooling is needed for supplying the cooling liquid to the cooling flow channel, and the cost is reduced.

The type of flow regulating valve is not limited, and in some embodiments, the flow regulating valve uses a two-position three-way proportional valve.

In some embodiments, referring to fig. 5, the turbocharger system further includes a first temperature sensor and a second temperature sensor. Wherein the first temperature sensor is provided at a downstream position of the radiator where the coolant flows to detect a temperature of the coolant flowing out from the radiator. A second temperature sensor is provided at a downstream position of the flow of the coolant of the turbocharger to detect the temperature of the coolant flowing out from the turbocharger, the second temperature sensor being connected in parallel with the intercooler.

Illustratively, when the temperature of the cooling liquid in the cooling assembly is greater than a first preset temperature, the cooling capacity of the cooling assembly is increased. And when the temperature of the cooling liquid in the cooling flow channel is higher than the second preset temperature, adjusting the flow regulating valve to increase the flow of the cooling liquid in the cooling flow channel, and stopping adjusting the flow regulating valve until the temperature of the cooling liquid is lower than the second preset temperature.

In one embodiment, the second predetermined temperature is greater than the first predetermined temperature.

In one embodiment, the temperature of the coolant in the cooling unit is substantially equal to the temperature of the coolant flowing out of the radiator measured by the first temperature sensor, and the temperature measured by the first temperature sensor may be set as the temperature of the coolant in the cooling unit. The temperature of the coolant in the cooling flow passage may be substantially equal to the temperature of the coolant flowing out of the turbocharger measured by the second temperature sensor, and the temperature measured by the second temperature sensor may be set as the temperature of the coolant in the cooling flow passage.

In this embodiment, when the temperature of the coolant in the cooling module is higher than the first preset temperature, the ECU controls the cooling fan to increase the rotation speed to increase the cooling effect on the radiator and/or controls the water pump to increase the rotation speed, so as to accelerate the flow of the coolant in the loop system, and reduce the temperature of the coolant in the cooling module to be lower than the first preset temperature.

When the temperature of the cooling liquid in the cooling flow channel is higher than the second preset temperature, the ECU controls the two-position three-way proportional valve to act, the flow rate of the cooling flow channel of the turbocharger is increased, the flow rate of the cooling flow channel of the intercooler is reduced, the cooling effect of the cooling liquid on the cooling flow channel of the turbocharger is improved, and when the temperature of the cooling liquid in the cooling flow channel is lower than the second preset temperature, the flow regulating valve is stopped being regulated.

It should be noted that, in order to ensure the air supercharging effect of the turbocharger, the temperature should be as high as possible within the tolerance range of the turbocharger components, but in order to protect the power machine 11, a second temperature sensor is added to prevent the turbocharger from exceeding a second preset temperature in a limit state and damaging the power machine 11.

In some embodiments, the turbo-charging system is further provided with a degassing channel, as shown in fig. 5, the degassing channel is communicated with the radiator and the expansion kettle, when high-temperature steam generated by temperature rise in the turbo-charging system enters the expansion kettle through the degassing channel and is discharged into the atmosphere, so that abnormal damage of the whole system caused by cavitation is avoided, and the reliability of parts of the whole system is ensured.

The various embodiments/implementations provided herein can be combined with each other without contradiction. The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A turbocharger for boosting the output power of an engine, comprising:

the power conversion device (1) comprises a power machine (11) and a rotating shaft (12) in driving connection with the power machine (11), wherein the power machine (11) has a power generation state for converting kinetic energy of the rotating shaft (12) into electric energy and a driving state for converting the electric energy into the kinetic energy of the rotating shaft (12), and the power machine (11) can be switched between the power generation state and the driving state;

the turbine assembly (5) is connected to one end of the rotating shaft (12), and the turbine assembly (5) is provided with a receiving cavity which is used for receiving the exhaust gas of an engine so as to drive the rotating shaft (12) to rotate; and

pinch roller subassembly (4), connect in the other end of pivot (12), pinch roller subassembly (4) have go out gas cavity (44), pinch roller subassembly (4) will under the drive of pivot (12) go out the gaseous input in gas cavity (44) the engine.

2. The turbocharger according to claim 1, further comprising a pressure relief valve (7) disposed on the pinch roller assembly (4), wherein the pinch roller assembly (4) has an air bypass passage, the pressure relief valve (7) is used for opening or closing the air bypass passage, and the pressure relief valve (7) opens the air bypass passage to enable the air outlet cavity (44) to pass through the air bypass pressure relief passage.

3. The turbocharger according to claim 2, further comprising a filter element, the pinch roller assembly (4) comprising:

the pinch roller body (41) is connected with the rotating shaft (12); and

the engine compression wheel comprises a first shell (42), the compression wheel body (41) is located in the first shell (42), the first shell (42) and the compression wheel body (41) are enclosed to form an air inlet cavity (43) and an air outlet cavity (44), the compression wheel body (41) is used for conveying the airflow of the air inlet cavity (43) to the air outlet cavity (44) so that the air enters the engine through the air outlet cavity (44), the pressure of the air outlet cavity (44) is greater than that of the air inlet cavity (43), the filtering piece is connected in series upstream of the air inlet cavity (43), the air bypass channel is formed in the first shell (42), and when the pressure relief valve (7) opens the air bypass channel, the air inlet cavity (43) and the air outlet cavity (44) are communicated through the air bypass channel.

4. The turbocharger according to claim 1, further comprising an exhaust bypass valve provided to the turbine assembly (5) for opening or closing the receiving chamber, the exhaust bypass valve opening the receiving chamber to relieve pressure in the receiving chamber.

5. The turbocharger according to any one of claims 1 to 4, wherein the power conversion device (1) further comprises a second housing (6), the power machine (11) is located in the second housing (6), the rotating shaft (12) is arranged through the second housing (6), and the second housing (6) is formed with a cooling flow passage for receiving cooling liquid to cool the power machine (11).

6. A control method of a turbocharger according to claim 1, characterized by comprising:

acquiring the pressure of the air outlet cavity (44);

and when the pressure of the air outlet cavity (44) is smaller than the preset pressure, the state of the power machine (11) is switched to the driving state.

7. The control method according to claim 6, characterized by further comprising: when the pressure of the air outlet cavity (44) is larger than the preset pressure, the state of the power machine (11) is switched to the power generation state.

8. The control method according to claim 7, wherein the turbocharger further comprises a pressure relief valve (7) provided to the pressure wheel assembly (4), the pressure wheel assembly (4) has an air bypass passage, the pressure relief valve (7) is used for opening or closing the air bypass passage, and the pressure relief valve (7) opens the air bypass passage to relieve the air outlet cavity (44) through the air bypass passage;

the control method further comprises the following steps: when the pressure of the air outlet cavity (44) is larger than the preset pressure, the power machine (11) is in a power generation state, the opening degree of the pressure release valve (7) is smaller than the opening degree in a fully-opened state, and the opening degree of the pressure release valve (7) is increased until the pressure of the air outlet cavity (44) is smaller than the preset pressure or until the opening degree of the pressure release valve (7) is equal to the opening degree in the fully-opened state.

9. The control method according to claim 8, wherein the turbocharger further includes an exhaust bypass valve provided to the turbine assembly (5) for opening or closing the receiving chamber, the exhaust bypass valve opening the receiving chamber to depressurize the receiving chamber;

the control method further comprises the following steps: when the pressure of the air outlet cavity (44) is larger than the preset pressure, the power machine (11) is in a power generation state, the opening degree of the pressure relief valve (7) is equal to the opening degree in a fully open state, and the opening degree of the exhaust bypass valve is increased until the pressure of the air outlet cavity (44) is smaller than the preset pressure.

10. A turbocharging system, comprising:

the turbocharger according to any one of claims 1 to 4, wherein the power conversion device (1) further comprises a second housing (6), the power machine (11) is located in the second housing (6), the rotating shaft (12) is arranged in the second housing (6) in a penetrating manner, and a cooling flow passage is formed in the second housing (6) and used for receiving cooling liquid to cool the power machine (11); and

a cooling assembly in series with the cooling flow passage to provide cooling fluid to the cooling flow passage.

11. The turbocharging system according to claim 10, further comprising a flow regulating valve and an intercooler, said intercooler being connected in parallel with said cooling flow passage, said flow regulating valve being connected in series with said cooling flow passage and said intercooler, respectively, said cooling liquid flowing through said flow regulating valve to said cooling flow passage and said intercooler, respectively, said intercooler being for cooling gas flowing from said gas outlet chamber (44) to said engine, said cooling assembly being connected in series with said turbocharger and said intercooler, respectively.

12. A temperature control method applied to the turbocharging system according to claim 11, comprising: