A hybrid power system with high engine utilization and a driving method thereof

Abstract

A hybrid power system with high engine utilization rate includes an engine and wheels, and also includes a coupling, a first motor, a second motor, a first clutch, a second clutch, a first epicyclic gear train, a second epicyclic gear train, a third epicyclic gear train, a first brake, and a second brake. The hybrid power system designed by the present invention is designed with dual motors and three sets of planetary gears, and the gearbox and the motor are modular. Through different combinations of two clutches and two brakes, a smooth torque change can be achieved, and the change range is wide and the adaptability is strong. When going downhill and decelerating, one motor generates electricity to recover energy, and when parking, both motors can generate electricity at the same time, and the engine utilization rate is high.

Description

Technical Field

[0001] The invention belongs to the field of hybrid power system development, and in particular relates to a hybrid power system with high engine utilization and a driving method thereof. Background Art

[0002] At present, automobile emissions and energy consumption have become a global problem. As environmental protection measures in countries around the world become more and more stringent, there are more and more alternatives to fuel engine vehicles, such as hydrogen energy vehicles, fuel cell vehicles, hybrid vehicles, etc. At present, the most practical and commercially viable model is only hybrid vehicles. Hybrid vehicles with low emissions and low energy consumption have become one of the mainstreams of the current development of the automobile industry. The key to hybrid vehicles is the hybrid power system, and its performance is directly related to the performance of the entire hybrid vehicle.

[0003] Hybrid power means that the car uses both fuel and electric drive. The advantage is that when the vehicle starts, stops or travels at a low speed, it can be driven solely by the motor, and the engine will not work unless it reaches a certain speed. Therefore, it can prevent the engine from being in an inefficient operating state, and the source of electrical energy is the engine, so only refueling is required.

[0004] After more than ten years of development, the hybrid powertrain assembly has evolved from the original discrete structure of the engine and motor to an integrated, modular structure of the engine, motor and gearbox; if a three-stage planetary gearbox is considered, the torque variation range is wide, but the structure is too complex and the size is large, which is not suitable for low-cost special-purpose vehicles, while the traditional two-stage planetary gearbox hybrid system is not suitable for special-purpose vehicles with complex operating conditions due to the power interruption during gear shifting. In short, some existing hybrid systems have too complex structures, some have low fuel economy, some have a small torque range, and some have power interruptions during gear shifting, which cannot fully meet the needs of special markets. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a hybrid power system with high engine utilization and a driving method thereof.

[0006] To achieve the above-mentioned purpose and other related purposes, the technical solution provided by the present invention is: a hybrid power system with high engine utilization, comprising an engine and a wheel, and also comprising a coupling, a first motor, a second motor, a first clutch, a second clutch, a first epicyclic gear train, a second epicyclic gear train, a third epicyclic gear train, a first brake, and a second brake; the first epicyclic gear train comprises a first planetary gear, a first sun gear, a first ring gear, and a first planetary carrier, the first planetary gear is respectively connected to the first sun gear and the first ring gear, and the first planetary gear is connected to the first planetary carrier; the second epicyclic gear train comprises a second planetary gear, a second sun gear, a second ring gear, and a second planetary carrier, the second planetary gear is respectively connected to the second sun gear and the second ring gear, and the second planetary gear is connected to the second planetary carrier; the third epicyclic gear train comprises a third planetary gear, a third sun gear, a third ring gear, and a third planetary carrier, the third planetary gear is respectively connected to the third sun gear and the third ring gear, and the third planetary gear is connected to the third planetary carrier;

[0007] The first sun gear is connected to the first motor, the first planet carrier is connected to the engine through the coupling, the first ring gear is connected to the third sun gear, the first ring gear is connected to the second motor through the first clutch, and the first ring gear is provided with a first brake; the second sun gear is connected to the second motor, and the second planet carrier is connected to the second motor through the second clutch; the third sun gear is connected to the first ring gear, the third planet carrier is connected to the wheel, the third ring gear is connected to the second planet carrier, and the third ring gear is provided with a second brake.

[0008] The preferred technical solution is: the first epicyclic gear train, the second epicyclic gear train, and the third epicyclic gear train are arranged in sequence from left to right, the first motor is located on the left side of the first epicyclic gear train, the second motor is located between the second epicyclic gear train and the third epicyclic gear train, and the engine is arranged on a side close to the first motor.

[0009] The preferred technical solution is: the coupling is a flexible coupling.

[0010] The present invention also provides a driving method of a hybrid power system with high engine utilization:

[0011] In the first working state, the first clutch is engaged, the second clutch is disengaged, the first brake is separated from the first gear ring, and the second brake is engaged with the third gear ring;

[0012] In the second working state, the first clutch is disconnected, the second clutch is engaged, the first brake is engaged with the first gear ring, and the second brake is separated from the third gear ring;

[0013] In the third working state, the first clutch is engaged, the second clutch is engaged, the first brake is separated from the first gear ring, and the second brake is separated from the third gear ring;

[0014] In the fourth working state, the first clutch is disconnected, the second clutch is disconnected, the first brake is separated from the first gear ring, and the second brake is combined with the third gear ring;

[0015] In the fifth working state, the first clutch is engaged, the second clutch is disengaged, the first brake is separated from the first ring gear, and the second brake is separated from the third ring gear.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0017] The hybrid power system designed by the present invention is designed with dual motors and three sets of planetary gears. The gearbox and motor are modular. Through different combinations of two clutches and two brakes, smooth torque changes can be achieved with a wide range of changes and strong adaptability. When going downhill and decelerating, one motor generates electricity to recover energy. When parking, both motors can generate electricity at the same time, and the engine utilization rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the present invention is shown in FIG. Figure 1 .

[0019] Figure 2 The structure of the present invention is shown in FIG. Figure 2 .

[0020] In the above drawings, engine 1, coupling 2, first motor 3, first sun gear 4, first planetary gear 5, first ring gear 6, second motor 7, second sun gear 8, second planetary gear 9, second ring gear 10, second planetary carrier 11, third ring gear 12, third planetary gear 13, third planetary carrier 14, second brake 15, third sun gear 16, second clutch 17, first clutch 18, first planetary carrier 19, first brake 20. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] See also Figure 1 and Figure 2 . It should be noted that in the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the descriptions, and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical", and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example: Figure 1 and Figure 2As shown, a hybrid power system with high engine utilization includes an engine 1 and wheels, and also includes a coupling 2, a first motor 3, a second motor 7, a first clutch 18, a second clutch 17, a first epicyclic gear train, a second epicyclic gear train, a third epicyclic gear train, a first brake 20 and a second brake 15; the first epicyclic gear train includes a first planetary gear 5, a first sun gear 4, a first ring gear 6 and a first planetary carrier 19, the first planetary gear 5 is connected to the first sun gear 4 and the first ring gear 6 respectively, and the first planetary gear 5 is connected to the first planetary carrier 19; the second epicyclic gear train includes a second planetary gear 9, a second sun gear 8, a second ring gear 10 and a second planetary carrier 11, the second planetary gear 9 is connected to the second sun gear 8 and the second ring gear 10 respectively, and the second planetary gear 9 is connected to the second planetary carrier 11; The third epicyclic gear train includes a third planetary gear 13, a third sun gear 16, a third ring gear 12 and a third planet carrier 14. The third planetary gear 13 is connected to the third sun gear 16 and the third ring gear 12 respectively, and the third planetary gear 13 is connected to the third planet carrier 14; the first sun gear 4 is connected to the first motor 3, the first planet carrier 19 is connected to the engine 1 through a coupling 2, the first ring gear 6 is connected to the third sun gear 16, the first ring gear 6 is connected to the second motor 7 through a first clutch 18, and the first ring gear 6 is provided with a first brake 20; the second sun gear 8 is connected to the second motor 7, and the second planet carrier 11 is connected to the second motor 7 through a second clutch 17; the third sun gear 16 is connected to the first ring gear 6, the third planet carrier 14 is connected to the wheel, the third ring gear 12 is connected to the second planet carrier 11, and the third ring gear 12 is provided with a second brake 15.

[0025] The hybrid system has five working states: in the first working state, the first clutch 18 is engaged, the second clutch 17 is disconnected, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is engaged with the third gear ring 12;

[0026] In the second working state, the first clutch 18 is disconnected, the second clutch 17 is engaged, the first brake 20 is engaged with the first gear ring 6, and the second brake 15 is separated from the third gear ring 12;

[0027] In the third working state, the first clutch 18 is engaged, the second clutch 17 is engaged, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is separated from the third gear ring 12;

[0028] In the fourth working state, the first clutch 18 is disconnected, the second clutch 17 is disconnected, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is combined with the third gear ring 12;

[0029] In the fifth working state, the first clutch 18 is engaged, the second clutch 17 is disconnected, the first brake 20 is separated from the first ring gear 6 , and the second brake 15 is separated from the third ring gear 12 .

[0030] There are three starting methods when the car is starting and under low-speed and high-load conditions.

[0031] 1. Pure electric starting: the engine is turned off or idling, the first clutch 18 is engaged, the second clutch 17 is disengaged, the first brake 20 is separated from the first ring gear 6, and the second brake 15 is engaged with the third ring gear 12. At this time, it is in the first working state, and the second motor 7 drives the vehicle to start with a large reduction ratio.

[0032] 2. When the vehicle speed gradually increases, the first clutch 18 is disengaged, the second clutch 17 is engaged, the first brake 20 is engaged with the first gear ring 6, and the second brake 15 is separated from the third gear ring 12. At this time, it is in the second working state, and the second motor 7 drives the vehicle with a small reduction ratio; when the vehicle speed further increases, the first clutch 18 is engaged, the second clutch 17 is engaged, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is separated from the third gear ring 12. At this time, it is in the third working state, and the second motor 1:1 directly drives the vehicle to run; the engine starts directly: the first clutch 18 is disengaged, the second clutch 17 is disengaged, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is engaged with the third gear ring 12. At this time, it is in the fourth working state, the engine drives the first generator and outputs power, and the vehicle starts smoothly.

[0033] 3. Hybrid starting: the first clutch 18 is engaged, the second clutch 17 is disengaged, the first brake 20 is separated from the first gear ring 6, and the second brake 15 is engaged with the third gear ring 12. At this time, it is in the first working state; the engine drives the first motor 3 to generate electricity and output power, and the second motor 7 synchronously drives the vehicle to start together. At this time, the output torque is very large and the vehicle has strong climbing performance. The working conditions after starting can determine its operating mode according to the battery capacity, vehicle load, etc.

[0034] Medium and high speed operating conditions: When the speed increases, the third operating state is adopted, the first clutch 18 is engaged, the second clutch 17 is engaged, the first brake 20 is separated from the first ring gear 6, the second brake 15 is separated from the third ring gear 12, the output transmission ratio is 1:1, the vehicle runs at medium and high speeds, and the second motor 7 can determine its driving or power generation mode according to the battery capacity, vehicle load, etc.

[0035] Slow downhill driving: When the vehicle goes downhill, the second working state is adopted, the first clutch 18 is disconnected, the second clutch 17 is engaged, the first brake 20 is engaged with the first ring gear 6, and the second brake 15 is separated from the third ring gear 12. The vehicle inertia drives the second motor 7 to generate electricity and recover energy, and the first motor 3 can decide whether to generate electricity based on the battery power.

[0036] Deceleration braking: the engine is idling and the second motor 7 generates electricity to recover energy.

[0037] Parking power generation: adopt the fifth working state, the first clutch 18 is engaged, the second clutch 17 is disconnected, the first brake 20 is separated from the first ring gear 6, the second brake 15 is separated from the third ring gear 12, the engine is idling or working normally, the first motor 3 and the second motor 7 generate electricity simultaneously, and the power generation efficiency is high.

[0038] The preferred embodiment is: Figure 2 As shown, the first epicyclic gear train, the second epicyclic gear train, and the third epicyclic gear train are arranged in sequence from left to right, the first motor 3 is located on the left side of the first epicyclic gear train, the second motor 7 is located between the second epicyclic gear train and the third epicyclic gear train, and the engine 1 is arranged on the side close to the first motor 3. The first motor 3 and the second motor 7 are arranged on the left and right sides of the first epicyclic gear train, which is convenient for heat dissipation and overall structure layout, rationally utilizes space, and is suitable for different power distribution methods.

[0039] The preferred embodiment is: Figure 2 As shown, the coupling 2 is a flexible coupling 2. It is integrally formed, has zero rotation clearance, can run synchronously, has the function of compensating radial, angular and axial deviations, and has the same clockwise and counterclockwise rotation characteristics.

[0040] The hybrid power system designed by the present invention is designed with dual motors and three sets of planetary gears. The gearbox and motor are modular. Through different combinations of two clutches and two brakes, smooth torque changes can be achieved with a wide range of changes and strong adaptability. When going downhill and decelerating, one motor generates electricity to recover energy. When parking, both motors can generate electricity at the same time, and the engine utilization rate is high.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A hybrid power system with high engine utilization, comprising an engine and wheels, characterized in that: The invention also includes a coupling, a first motor, a second motor, a first clutch, a second clutch, a first epicyclic gear train, a second epicyclic gear train, a third epicyclic gear train, a first brake and a second brake; the first epicyclic gear train includes a first planetary gear, a first sun gear, a first ring gear and a first planet carrier, the first planetary gear is connected to the first sun gear and the first ring gear respectively, and the first planetary gear is connected to the first planet carrier; the second epicyclic gear train includes a second planetary gear, a second sun gear, a second ring gear and a second planet carrier, the second planetary gear is connected to the second sun gear and the second ring gear respectively, and the second planetary gear is connected to the second planet carrier; the third epicyclic gear train includes a third planetary gear, a third sun gear, a third ring gear and a third planet carrier, the third planetary gear is connected to the third sun gear and the third ring gear respectively, and the third planetary gear is connected to the third planet carrier; The first sun gear is connected to the first motor, the first planet carrier is connected to the engine through the coupling, the first ring gear is connected to the third sun gear, the first ring gear is connected to the second motor through the first clutch, and the first ring gear is provided with a first brake; the second sun gear is connected to the second motor, the second planet carrier is connected to the second motor through the second clutch; the third sun gear is connected to the first ring gear, the third planet carrier is connected to the wheel, the third ring gear is connected to the second planet carrier, and the third ring gear is provided with a second brake; There are three starting modes for vehicles using this hybrid system when starting or operating at low speed and high load: Pure electric start: The engine is turned off or idling, the first clutch is engaged, the second clutch is disengaged, the first brake is separated from the first gear ring, and the second brake is engaged with the third gear ring. At this time, the vehicle is in the first working state, and the second motor with a large reduction ratio drives the vehicle to start. When the vehicle speed gradually increases, the first clutch is disconnected, the second clutch is engaged, the first brake is engaged with the first gear ring, and the second brake is separated from the third gear ring. At this time, the vehicle is in the second working state, and the second motor drives the vehicle with a small reduction ratio. When the vehicle speed further increases, the first clutch is engaged, the second clutch is engaged, the first brake is separated from the first gear ring, and the second brake is separated from the third gear ring. At this time, the vehicle is in the third working state, and the second motor directly drives the vehicle with a 1:1 ratio. The engine starts directly: the first clutch is disconnected, the second clutch is disconnected, the first brake is separated from the first gear ring, and the second brake is combined with the third gear ring. At this time, it is in the fourth working state, the engine drives the first generator and outputs power, and the vehicle starts smoothly; Hybrid start: The first clutch is engaged, the second clutch is disengaged, the first brake is separated from the first gear ring, and the second brake is engaged with the third gear ring. At this time, the vehicle is in the first working state. The engine drives the first motor to generate electricity and output power, and the second motor drives the vehicle to start synchronously. Medium and high speed working condition: when the speed increases, the third working state is adopted, the first clutch is engaged, the second clutch is engaged, the first brake and the first gear ring are separated, the second brake and the third gear ring are separated, the output transmission ratio is 1:1, and the vehicle runs at medium and high speed; Slow downhill driving: When the vehicle is going downhill, the second working state is adopted, the first clutch is disconnected, the second clutch is engaged, the first brake is engaged with the first gear ring, the second brake is separated from the third gear ring, and the vehicle inertia drives the second motor 7 to generate electricity and recover energy; Deceleration braking: When the engine is idling, the second motor generates electricity to recover energy; Parking power generation: adopt the fifth working state, the first clutch is engaged, the second clutch is disengaged, the first brake is separated from the first ring gear, the second brake is separated from the third ring gear, the engine is idling or working normally, and the first motor and the second motor generate electricity simultaneously.

2. The hybrid power system with high engine utilization according to claim 1, characterized in that: The first epicyclic gear train, the second epicyclic gear train, and the third epicyclic gear train are arranged in sequence from left to right, the first motor is located on the left side of the first epicyclic gear train, the second motor is located between the second epicyclic gear train and the third epicyclic gear train, and the engine is arranged on a side close to the first motor.

3. A hybrid power system with high engine utilization according to claim 2, characterized in that: The coupling is a flexible coupling.

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