Engine system and automobile

Abstract

The utility model provides an engine system and an automobile, the engine system comprises an engine air inlet and exhaust flow path, the engine air inlet and exhaust flow path comprises an air compressor, an electric supercharger, an engine, a turbine and a heat exchanger which are sequentially connected through a pipeline; the heat recovery loop comprises a heat exchanger and a power conversion device which are sequentially connected through a pipeline; gas in the engine intake and exhaust flow path and a medium in the heat recovery loop can exchange heat in the heat exchanger. The engine system further comprises a first switch and a motor which are connected with the power conversion device, and the first switch is used for connecting or disconnecting power connection between the power conversion device and the motor. The state of the first switch is controlled according to the working condition of the engine, under the working condition that electric auxiliary supercharging is needed, waste heat generated under the working condition that engine waste gas energy is sufficient can be recycled into mechanical energy through the power conversion device, the electric supercharger is driven through the recycled mechanical energy, and therefore the problem that the supercharging capacity of a turbocharger is insufficient under the engine lean-burn working condition is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine system and a car comprising the engine system. Background Art

[0002] The low-carbon development of the automotive industry chain will better adapt to the social energy and environmental carrying capacity, improve the efficiency of energy resource utilization, reduce fossil energy consumption, and reduce the emission of carbon dioxide and other pollutants. For car companies, in order to achieve the goal of reducing fuel consumption and emissions, it is necessary to develop engines with higher thermal efficiency. Diluted combustion (including exhaust gas recirculation and lean burn) technology is a key technology for engines to achieve high thermal efficiency. Compared with non-diluted equivalent combustion, diluted combustion under the same load requires more intake air to obtain a high exhaust gas recirculation (EGR) rate or high air-fuel ratio lean burn. However, diluted combustion will lead to insufficient engine exhaust gas energy, insufficient turbocharging capacity, and then a decrease in the engine's intake capacity.

[0003] In order to compensate for the problem of insufficient turbocharger intake capacity under lean-burn conditions, the existing method is to use an electric supercharger to assist in boosting; since the electric supercharger consumes additional electrical energy, this will lead to an increase in the equivalent fuel consumption of the engine taking into account the power consumption. Therefore, from the perspective of comprehensive thermal efficiency, the effect of using an electric supercharger to reduce energy consumption is not ideal. Utility Model Content

[0004] The utility model aims to solve the problem that the engine system of the prior art consumes extra electric energy by using an electric supercharger to assist supercharging, so that the effect of using the electric supercharger to reduce energy consumption is not ideal.

[0005] To solve the above problems, the utility model provides an engine system, comprising: an engine intake and exhaust flow path, the engine intake and exhaust flow path includes a compressor, an electric supercharger, an engine, a turbine and a heat exchanger connected in sequence through pipelines, wherein the compressor and the turbine are transmission-connected to form a turbocharger; a heat recovery circuit, the heat recovery circuit includes a heat exchanger connected in sequence through pipelines, and a power conversion device.

[0006] Among them, the gas in the engine intake and exhaust flow paths and the medium in the heat recovery circuit can exchange heat in the heat exchanger, so that the medium in the heat recovery circuit is heated and evaporated into steam in the heat exchanger and then enters the power conversion device to perform work, driving the power components in the power conversion device to move; and the engine system also includes an electric motor and a first switch, the power conversion device, the first switch, the electric motor and the electric supercharger are connected in sequence, and the first switch is used to connect or disconnect the power connection between the power conversion device and the electric motor.

[0007] With the above solution, in the engine intake and exhaust flow path, the air passes through the compressor, and then enters the engine after being pressurized by the electric supercharger. The exhaust gas from the engine exhaust pipe passes through the turbocharger turbine to work and then enters the heat exchanger to exchange heat with the medium in the heat recovery circuit; the medium is heated in the heat exchanger and enters the power conversion device to convert thermal energy into kinetic energy. The power conversion device and the motor can be flexibly disconnected and connected through the first switch, wherein when the first switch is connected, the power conversion device drives the motor to operate, and the motor drives the electric supercharger to operate.

[0008] The engine system provided by the utility model controls the state of the first switch according to the working condition of the engine. When electric auxiliary supercharging is required, the waste heat of the engine exhaust gas under the working condition with sufficient energy can be recovered as mechanical energy through the power conversion device, and the electric supercharger is driven by the recovered mechanical energy. Therefore, the utility model can solve the problem of insufficient supercharging capacity of the turbocharger under the lean combustion condition of the engine, and compared with the pure electric supercharger auxiliary turbocharging solution, the problem of increased comprehensive fuel consumption after conversion due to the power consumption of the electric supercharger will not occur.

[0009] According to another specific embodiment of the present invention, the engine system disclosed in the embodiment of the present invention has an electric motor integrated with a generator function; the engine system also includes a battery and a second switch, and the battery is electrically connected to the electric motor; the second switch is respectively connected to the electric motor and the electric supercharger, and is used to connect or disconnect the power connection between the electric motor and the electric supercharger.

[0010] By adopting the above scheme, the states of the first switch and the second switch can be controlled according to the actual working conditions of the engine to realize different working modes. In the working condition where the exhaust gas energy is sufficient, the engine waste heat can be used to generate electricity and stored; in the lean combustion working condition where the exhaust gas energy is insufficient, the pre-stored electric energy can be provided to the electric supercharger to assist the supercharging without consuming additional vehicle electric energy; in the working condition where the exhaust gas energy is sufficient and electric auxiliary supercharging is required, the power conversion device can directly drive the electric supercharger through the electric motor.

[0011] According to another specific embodiment of the present invention, in the engine system disclosed in the embodiment of the present invention, the power conversion device is an expander.

[0012] According to another specific embodiment of the present utility model, in the engine system disclosed in the embodiment of the present utility model, the first switch and the second switch are clutches.

[0013] According to another specific embodiment of the present utility model, in the engine system disclosed in the embodiment of the present utility model, the engine intake and exhaust flow path also includes a one-way valve, one end of the one-way valve is connected and communicated with the pipeline between the compressor and the electric supercharger, and the other end of the one-way valve is connected and communicated with the pipeline between the electric supercharger and the engine.

[0014] By adopting the above solution, a branch controlled by a one-way valve is added to the engine intake and exhaust flow path, and the electric supercharger can be bypassed when auxiliary boosting is not needed; thereby flexibly controlling whether the intake needs to be boosted twice or only once.

[0015] According to another specific embodiment of the utility model, in the engine system disclosed in the embodiment of the utility model, the heat recovery circuit also includes a pump and a condenser; the pump is connected to the heat exchanger through a pipeline, and the condenser is respectively connected to the power conversion device and the pump through pipelines.

[0016] With the above scheme, the liquid medium is pressurized by a pump and enters the heat exchanger to be heated to high-temperature and high-pressure superheated steam by the exhaust gas, and then enters the power conversion device to perform work. Subsequently, the exhaust steam is condensed into liquid through the condenser.

[0017] According to another specific embodiment of the present invention, the engine system disclosed in the embodiment of the present invention further includes a controller and a collection device, the collection device is used to collect operating condition information of the engine; the controller is respectively communicated with the collection device and the first switch, and controls the first switch to be connected or disconnected according to the operating condition information of the engine.

[0018] By adopting the above scheme, a controller and a data collection device are set up to make the engine system control more precise and realize flexible switching of modes according to the intake demand and exhaust gas energy amount of the engine operating conditions.

[0019] According to another specific embodiment of the present utility model, in the engine system disclosed in the embodiment of the present utility model, the acquisition device includes a rotation speed sensor, an accelerator pedal position sensor and an oxygen sensor.

[0020] According to another specific embodiment of the utility model, in the engine system disclosed in the embodiment of the utility model, when the engine system also includes a battery and a second switch, the controller is also respectively communicated with the battery, the second switch and the motor, so as to obtain the battery power, control the operating state of the motor and the connection or disconnection of the second switch.

[0021] By adopting the above scheme, the controller obtains the engine operating conditions in real time, and controls the first switch and the second switch according to the boost requirements and exhaust gas energy of different engine operating conditions, thereby realizing multiple working modes.

[0022] The utility model also provides a car, comprising the engine system provided by the utility model.

[0023] The beneficial effects of the utility model are:

[0024] The engine system provided by the utility model can utilize the energy of the engine exhaust gas to drive the electric supercharger when the exhaust gas energy is sufficient and electric auxiliary supercharging is required, thereby solving the problem of insufficient supercharging capacity of the turbocharger under the engine lean-burn condition. Compared with the pure electric supercharger assisted turbocharging solution, the problem of increased converted comprehensive fuel consumption due to the power consumption of the electric supercharger will not occur. In addition, in the utility model, the engine exhaust gas first passes through the turbine and then enters the heat exchanger for heat exchange, that is, the exhaust gas is first used to drive the turbine to do work, and the exhaust gas quality and utilization efficiency are better. In addition, the utility model can improve the low-speed torque of the engine without consuming additional electrical energy and sacrificing fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a first embodiment of an engine system provided by the utility model;

[0026] Figure 2 A schematic structural diagram of a second embodiment of the engine system provided by the utility model;

[0027] Figure 3 This is a schematic structural diagram of a third embodiment of the engine system provided by the utility model.

[0028] Description of reference numerals:

[0029] 1. Engine intake and exhaust flow path;

[0030] 11. Compressor; 12. Electric supercharger; 13. Engine; 14. Turbine; 15. Heat exchanger; 16. Check valve;

[0031] 2. Heat recovery circuit;

[0032] 21. Power conversion device; 22. Pump; 23. Condenser;

[0033] 3. Electric motor;

[0034] 4. First switch;

[0035] 5. Second switch;

[0036] 6. Battery;

[0037] 7. Controller. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Example 1

[0040] The utility model provides an engine system capable of utilizing engine waste heat energy to assist supercharging, and is used to solve the problem of insufficient supercharging capacity of a turbocharger under dilution working conditions.

[0041] The engine system provided by the utility model is as follows: Figure 1-Figure 3 As shown, from the device point of view, the engine system includes a turbocharger (including a compressor 11 and a turbine 14 connected in a transmission manner), an electric supercharger 12, an engine 13, a heat exchanger 15, a power conversion device 21, an electric motor 3, and a first switch 4; wherein the power conversion device 21, the first switch 4, the electric motor 3 and the electric supercharger 12 are mechanically connected in sequence, and the first switch 4 is used to connect or disconnect the power connection between the power conversion device 21 and the electric motor 3.

[0042] like Figure 1-Figure 3 As shown, from the flow path of the fluid in the engine system, the engine system includes an engine intake and exhaust flow path 1 and a heat recovery circuit 2. Among them, the engine intake and exhaust flow path 1 includes a compressor 11, an electric supercharger 12, an engine 13, a turbine 14 and a heat exchanger 15 connected in sequence through pipelines. The compressor 11 and the turbine 14 constitute a turbocharger, and the gas flows along the engine intake and exhaust flow path 1 (the arrow in the figure shows the flow direction). The heat recovery circuit 2 includes a heat exchanger 15 and a power conversion device 21 connected in sequence through pipelines, and the heat recovery circuit 2 has a medium circulating therein (the arrow in the figure shows the flow direction).

[0043] Specifically, the engine intake and exhaust flow path 1 includes an intake path and an exhaust path. The intake path is where the gas enters the compressor 11 from the air intake of the engine system, and the compressor 11 compresses the air to increase the pressure. When the turbocharger intake capacity is insufficient under lean combustion conditions, the air further enters the electric supercharger 12, and the electric supercharger 12 further supercharges the air and then delivers it to the engine 13 for combustion; it should be noted that the intake path may also include devices such as air filters, throttles, and intercoolers commonly used in the art. The exhaust path is that the combustion exhaust gas of the engine 13 is discharged into the turbine 14 through the exhaust manifold of the engine 13, so that the turbine 14 performs work on the compressor 11, and the exhaust gas passing through the turbine 14 enters the heat exchanger 15 for heat exchange; it should be noted that the exhaust path may also include catalysts, mufflers and other devices commonly used in the field, and the exhaust gas after heat exchange can be discharged after being processed by the catalyst and muffler; the exhaust gas can also flow from the turbine 14 or the heat exchanger 15 in the exhaust path through the EGR valve to the intake path for exhaust gas recirculation.

[0044] In a specific embodiment, Figure 1-Figure 3As shown, the engine intake and exhaust flow path 1 also includes a one-way valve 16. Specifically, the one-way valve 16 is in the intake path, one end of the one-way valve 16 is connected and communicated with the pipeline between the compressor 11 and the electric supercharger 12, and the other end of the one-way valve 16 is connected and communicated with the pipeline between the electric supercharger 12 and the engine 13. By adding a branch controlled by the one-way valve 16 to the engine intake and exhaust flow path 1, the electric supercharger 12 can be bypassed when auxiliary supercharging is not required; thereby, the intake can be flexibly controlled to undergo two superchargings, that is, the intake passes through the compressor 11 and the electric supercharger 12 in sequence (the one-way valve 16 is closed) before entering the engine cylinder, or the intake only undergoes a single supercharging, that is, the intake passes through the compressor 11 and the open one-way valve 16 in sequence to enter the engine cylinder.

[0045] The exhaust gas from the engine intake and exhaust flow path 1 that passes through the turbine 14 enters the heat exchanger 15 and exchanges heat with the medium in the heat recovery loop 2 in the heat exchanger 15, so that the medium in the heat recovery loop 2 is heated and evaporated into steam in the heat exchanger 15 and then enters the power conversion device 21 to perform work, thereby driving the power components in the power conversion device 21 to operate. Specifically, the medium refers to a medium substance that can realize the mutual conversion of thermal energy and mechanical energy, which can be water, refrigerant, carbon dioxide, etc. The power conversion device 21 in the utility model specifically refers to a device that can convert thermal energy into mechanical energy, such as an expander, a steam engine, a steam turbine, etc. In one preferred embodiment, the power conversion device 21 is an expander, and the principle of the medium driving the expander is that high-temperature and high-pressure steam expands adiabatically through the expander to perform work.

[0046] In a specific embodiment, Figure 1-Figure 3 As shown, the heat recovery loop 2 also includes a pump 22 and a condenser 23; the pump 22 is connected to the heat exchanger 15 through a pipeline, and the condenser 23 is connected to the power conversion device 21 and the pump 22 through pipelines; wherein the pump 22 is a high-pressure pump. The liquid medium is pressurized by the pump 22 and enters the heat exchanger 15 to be heated to high-temperature and high-pressure superheated steam by the exhaust gas, and then enters the power conversion device 21 to perform work, and then the exhaust steam is condensed into liquid through the condenser 23.

[0047] The first switch 4 is specifically a power switch capable of connecting or disconnecting the power connection, such as a clutch and a synchronizer, etc.; in one preferred embodiment, the first switch 4 is a clutch. When the first switch 4 connects the power connection between the power conversion device 21 and the motor 3, the mechanical energy in the power conversion device 21 can be transmitted to the motor 3, thereby driving the motor 3 to operate, and the operating motor 3 can drive the electric supercharger 12 to operate. The first switch 4 is set so that the power conversion device 21 and the motor 3 can be flexibly disconnected and connected, so that the working mode can be controlled according to the working condition of the engine 13. For example, when the exhaust gas energy is sufficient and the electric supercharger 12 is not required to assist, the first switch 4 is disconnected, the electric supercharger 12 does not work, and if the one-way valve 16 is set, the intake air passes through the one-way valve 16 branch after the compressor 11; when the exhaust gas energy is sufficient and electric auxiliary supercharging is required, the first switch 4 is connected to combine the power conversion device 21, the motor 3 and the electric supercharger 12; the electric supercharger 12 is directly driven to work by the power conversion device 21.

[0048] The scheme of this embodiment controls the state of the first switch 4 according to the working condition of the engine 13. When electric auxiliary supercharging is required, the waste heat under the working condition of sufficient engine exhaust gas energy can be recovered as mechanical energy through the power conversion device 21, and the recovered mechanical energy can be used to drive the electric supercharger 12, thereby solving the problem of insufficient turbocharger supercharging capacity under lean-burn conditions of the engine. Compared with the pure electric supercharger 12 auxiliary turbocharging scheme, the problem of increased converted comprehensive fuel consumption due to the power consumption of the electric supercharger 12 will not occur. In addition, in the utility model, the engine exhaust gas first passes through the turbine 14 and then enters the heat exchanger 15 for heat exchange, that is, the exhaust gas is preferentially used to drive the turbine 14 to do work, and the exhaust gas quality and utilization efficiency are better. In addition, the utility model can improve the low-speed torque of the engine without consuming additional electrical energy and sacrificing fuel consumption.

[0049] Example 2

[0050] Based on the engine system provided in Example 1, the motor 3 in the engine system of this embodiment also integrates the function of a generator; Figure 2 and Figure 3 As shown, the engine system further includes a battery 6 and a second switch 5, the battery 6 is electrically connected to the motor 3; the second switch 5 is respectively connected to the motor 3 and the electric supercharger 12, and is used to connect or disconnect the power connection between the motor 3 and the electric supercharger 12.

[0051] Specifically, the second switch 5 is a power switch capable of connecting or disconnecting a power connection, such as a clutch and a synchronizer. In one preferred embodiment, the second switch 5 is a clutch. Furthermore, both the first switch 4 and the second switch 5 may be clutches, or one of the first switch 4 and the second switch 5 may be a clutch and the other may be a synchronizer.

[0052] In this embodiment, by setting up a storage battery 6, the waste heat of the engine 13 exhaust gas with sufficient energy can be recovered for power generation and stored in advance; the first switch 4 and the second switch 5 are set, so that the power conversion device 21 and the motor 3, and the electric supercharger 12 and the motor 3 can be flexibly disconnected and connected, so as to realize multiple working modes. When the first switch 4 is connected and the second switch 5 is connected, the power conversion device 21 drives the motor 3 to operate, the motor 3 drives the electric supercharger 12 to operate, or the motor 3 acts as a generator to generate electricity and stores electric energy in the storage battery 6; when the first switch 4 is connected and the second switch 5 is disconnected, the power conversion device 21 drives the motor 3 to operate, the motor 3 acts as a generator to generate electricity and stores electric energy in the storage battery 6; when the first switch 4 is disconnected and the second switch 5 is connected, the storage battery 6 provides electric energy for the motor 3, and the motor 3 drives the electric supercharger 12 to operate.

[0053] The engine system provided in this embodiment can control the states of the first switch 4 and the second switch 5 according to the actual working conditions of the engine to realize different working modes. In the working condition where the exhaust gas energy is sufficient, the residual heat of the engine can be used to generate electricity and stored; in the lean combustion working condition where the exhaust gas energy is insufficient, the pre-stored electric energy can be provided to the electric supercharger 12 to assist the supercharging without consuming additional electric energy of the whole vehicle; in the working condition where the exhaust gas energy is sufficient and electric auxiliary supercharging is required, the power conversion device 21 can be used by the motor 3 to directly drive the electric supercharger 12.

[0054] Example 3

[0055] Based on the engine system provided in Example 1 or Example 2, the engine system of this embodiment is as follows Figure 3 As shown, the engine system also includes a controller 7 and a collection device (not shown in the figure), the collection device is used to collect the working condition information of the engine 13; the controller 7 is respectively connected to the collection device and the first switch 4 for communication, and controls the first switch 4 to be connected or disconnected according to the working condition information of the engine 13. Figure 3 As shown, when the engine system also includes a battery 6 and a second switch 5, the controller 7 is also respectively connected to the battery 6, the second switch 5 and the motor 3 for obtaining the power of the battery 6, controlling the operating state of the motor 3 and the connection or disconnection of the second switch 5.

[0056] Among them, the operating condition information specifically includes whether the exhaust gas energy of the engine 13 is sufficient, whether it is a lean-burn condition, whether it is a high-load condition, etc. The collection device specifically includes sensors and other devices that can obtain these operating condition information of the engine 13, such as a speed sensor, an accelerator pedal position sensor, an oxygen sensor, an intake pressure sensor, a throttle position sensor, etc.

[0057] In the engine system provided in this embodiment, the controller 7 obtains the engine operating conditions in real time, and controls the first switch 4 to select the corresponding operating mode according to the boost requirements and exhaust gas energy of different engine operating conditions; and when there is a second switch 5, it also controls the second switch 5 to achieve multiple operating modes.

[0058] In one specific implementation, the acquisition device includes a speed sensor, an accelerator pedal position sensor and an oxygen sensor, which can be arranged in the engine 13. The speed sensor is used to obtain the engine speed, the accelerator pedal position sensor is used to obtain the engine required torque, and the oxygen sensor is used to obtain the excess air coefficient.

[0059] Specifically, taking the acquisition device including a speed sensor, an accelerator pedal position sensor and an oxygen sensor, and the engine system also including a battery 6 and a second switch 5 as an example; when the engine system provided in this embodiment is actually running, the controller 7 determines the engine operating condition according to the speed, load and excess air coefficient of the engine 13 obtained by the acquisition device, and further determines whether the exhaust gas energy is sufficient and whether the electric supercharger 12 is required to assist, and then controls the first switch 4 to be connected or disconnected, and the second switch 5 to be connected or disconnected. For example, when the speed reaches more than 2000rpm, the torque reaches more than 120Nm, and the excess air coefficient = 1, it is judged to be a high-speed high-load equivalent combustion condition. At this time, the exhaust gas energy is relatively sufficient and does not require the assistance of the electric supercharger 12. The controller 7 controls the first switch 4 to be connected, the second switch 5 to be disconnected, the power conversion device 21 and the motor 3 are connected in power, the motor 3 is a power generation function, and the power conversion device 21 drives the motor 3 to generate electricity and store it in the battery 6. When the speed is in the range of 1200-3000rpm, the torque is below 120Nm, and the excess air coefficient is greater than 1, it is judged as a medium-low speed medium-low load ultra-lean combustion condition. At this time, the exhaust gas energy is insufficient and the electric supercharger 12 is required to assist in supercharging. The controller 7 controls the first switch 4 to be disconnected and the second switch 5 to be connected, so that the electric supercharger 12 and the motor 3 are connected in power, and the battery 6 can provide the necessary electric energy for the motor 3 to drive the electric supercharger 12 to operate without consuming additional vehicle power. When the speed is below 3000rpm, the torque is below 120Nm, and the excess air coefficient is 1, it is judged as a medium-low speed medium-low load equivalent combustion condition. At this time, the exhaust gas energy is sufficient and electric auxiliary supercharging is required. The controller 7 controls the first switch 4 and the second switch 5 to be connected at the same time, so that the power conversion device 21, the motor 3 and the electric supercharger 12 are connected in power at the same time, and the power conversion device 21 can directly drive the electric supercharger 12, and the motor 3 chooses to drive or generate electricity according to the amount of driving force required by the electric supercharger 12.

[0060] Furthermore, the controller 7 is also connected to the battery 6 and the motor 3 for communication, so as to obtain the power of the battery 6. In the charging mode, when the battery 6 is fully charged, the motor 3 is controlled to stop generating electricity. In the mode in which the battery 6 supplies power to the motor 3, when the power of the battery 6 is too low, the battery 6 is controlled to stop supplying power to the motor 3.

[0061] When the heat recovery circuit 2 further includes a pump 22 and a condenser 23; Figure 3 The controller 7 is also connected to the pump 22 for communication, and controls the operation of the pump 22 according to the operating conditions of the engine 13. For example, when the first switch 4 needs to be controlled to be connected and the power conversion device 21 needs to drive the motor 3 to operate, the operation of the pump 22 is controlled at the same time to promote the medium in the heat recovery circuit 2 to drive the power conversion device 21.

[0062] By adopting the solution of this embodiment, the controller 7 and the acquisition device are provided to make the engine system control more precise and realize flexible switching of modes according to the demand for intake air and the amount of exhaust gas energy under the engine operating conditions.

[0063] Example 4

[0064] The utility model also provides a car, wherein the car comprises the engine system provided by embodiment 1, embodiment 2 or embodiment 3.

[0065] The above is a description of the implementation mode of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation mode. On the contrary, the purpose of introducing the utility model in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, the following description will include many specific details. The present utility model can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present utility model, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0066] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0067] The above has clearly and completely described the technical solution of the utility model in combination with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0068] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0069] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0070] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An engine system, characterized in that: include: An engine intake and exhaust flow path, the engine intake and exhaust flow path comprises a compressor, an electric supercharger, an engine, a turbine and a heat exchanger connected in sequence through pipelines, wherein the compressor and the turbine are drivingly connected to form a turbocharger; a heat recovery circuit, the heat recovery circuit comprising the heat exchanger and the power conversion device connected in sequence through a pipeline; The gas in the engine intake and exhaust flow path can exchange heat with the medium in the heat recovery circuit in the heat exchanger, so that the medium in the heat recovery circuit is heated and evaporated into steam in the heat exchanger and then enters the power conversion device to perform work, thereby driving the power components in the power conversion device to operate; Furthermore, the engine system further includes an electric motor and a first switch. The power conversion device, the first switch, the electric motor and the electric supercharger are connected in sequence, and the first switch is used to connect or disconnect the power connection between the power conversion device and the electric motor.

2. The engine system according to claim 1, characterized in that: The electric motor integrates a generator function; the engine system further includes a second switch and a battery, the battery being electrically connected to the electric motor; the second switch is respectively connected to the electric motor and the electric supercharger, and is used to connect or disconnect the power connection between the electric motor and the electric supercharger.

3. The engine system according to claim 1, characterized in that: The power conversion device is an expander.

4. The engine system according to claim 2, characterized in that: The first switch and the second switch are both clutches.

5. The engine system according to claim 1, characterized in that: The engine intake and exhaust flow path also includes a one-way valve, one end of which is connected and communicated with the pipeline between the compressor and the electric supercharger, and the other end of which is connected and communicated with the pipeline between the electric supercharger and the engine.

6. The engine system according to claim 1, characterized in that: The heat recovery loop further includes a pump and a condenser; the pump is connected to the heat exchanger via a pipeline, and the condenser is respectively connected to the power conversion device and the pump via pipelines.

7. The engine system according to any one of claims 1 to 6, characterized in that: The engine system further includes a controller and a collection device, wherein the collection device is used to collect operating condition information of the engine; The controller is respectively connected to the acquisition device and the first switch for communication, and controls the first switch to be connected or disconnected according to the operating condition information of the engine.

8. The engine system according to claim 7, characterized in that: The acquisition device includes a rotation speed sensor, an accelerator pedal position sensor and an oxygen sensor.

9. The engine system according to claim 7, characterized in that: When the engine system also includes a battery and a second switch, the controller is also respectively connected to the battery, the second switch and the motor for obtaining the battery power, controlling the operating state of the motor and the connection or disconnection of the second switch.

10. An automobile, characterized in that: The automobile comprises the engine system according to any one of claims 1-9.

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