Commercial vehicle AMT hybrid driving system and method

Abstract

The invention discloses a commercial vehicle AMT hybrid drive system and method, the system comprises an AMT gearbox, an output shaft is provided with a first separation structure, a gear shaft and a second separation structure, and the gear shaft is connected with a speed reducer and a drive motor. According to the AMT hybrid driving system and method for the commercial vehicle, the gear shaft is additionally arranged on the output shaft of the AMT and connected with the speed reducer and the motor, and under the pure electric working condition, power passes through the driving motor, the speed reducer and the output shaft, and operation is simple and efficient; the dynamic property requirements of low-speed heavy load, continuous climbing and the like of the whole vehicle are met, and the output dynamic property of the whole vehicle is good; a driving motor and a speed reducer mechanism are arranged at the rear part of the AMT and can be made into an independent box body, so that the heat radiation influence of an engine is avoided, and meanwhile, a driving motor cooling system can be independently designed; the rotating speed of the driving motor is not affected by the rotating speed of the engine, the model selection space is large, high rotating speed and low torque are achieved through cooperation with the speed reducing mechanism, and the motor is higher in working efficiency and lower in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of commercial vehicles, and more specifically, to a commercial vehicle AMT hybrid drive system and method. Background Art

[0002] With the rapid development of new energy vehicles, hybrid vehicles, as a product between traditional fuel vehicles and pure electric vehicles, are more energy-efficient than traditional fuel vehicles, and solve the mileage anxiety and endurance problems of pure electric vehicles. As one of the typical hybrid routes for commercial vehicles, the AMT hybrid solution can utilize the advantages of the original gearbox to improve efficiency, be compatible with four-wheel drive, and reduce motor torque. The advantage of hybrid is strong power, which is mainly suitable for heavy-load, mountainous areas and other scenes, and has specific market demand.

[0003] The current AMT hybrid solution mostly adopts the P2 solution, that is, the drive motor is placed between the engine and the AMT gearbox, that is, at the engine output end, close to the AMT gearbox side, with a clutch between the engine. The disadvantages of this AMT hybrid solution are: the P2 structure is sandwiched between the gearbox and the engine, and the drive motor is very obviously affected by temperature. The high temperature heat radiation of the engine promotes the acceleration of the motor temperature rise, which causes the motor to operate at reduced power, reduce power output, and affect the performance of the power system; and the motor speed is limited by the engine speed, which has high requirements for the drive motor, low speed and high torque, resulting in high cost and low performance, and the AMT gearbox body changes greatly.

[0004] Therefore, there is an urgent need for a commercial vehicle AMT hybrid drive system and method. Summary of the invention

[0005] The object of the present invention is to provide a commercial vehicle AMT hybrid drive system and method to solve the above-mentioned problems in the prior art.

[0006] The present invention provides an AMT hybrid drive system for commercial vehicles, which includes: an AMT gearbox, an output shaft of which is provided with a first separation structure, a gear shaft and a second separation structure, and the gear shaft is connected with a reducer and a drive motor.

[0007] As described above, in the commercial vehicle AMT hybrid drive system, preferably, the drive motor includes a P3 module.

[0008] As described above, in the commercial vehicle AMT hybrid drive system, preferably, the gear shaft is arranged between the first separation structure and the second separation structure, one end of the gear shaft is connected to the first separation structure, and the other end is connected to the second separation structure.

[0009] In the commercial vehicle AMT hybrid drive system as described above, preferably, the reducer and the drive motor are respectively connected to the gears on the gear shaft.

[0010] As described above, in the commercial vehicle AMT hybrid drive system, preferably, the drive motor comprises an HEV type or a PHEV type.

[0011] As described above, in the commercial vehicle AMT hybrid drive system, preferably, the drive motor and the reducer are located at the rear of the AMT gearbox, and the drive motor and the reducer are designed with separate housings.

[0012] The present invention also provides a commercial vehicle AMT hybrid drive system using the above system, which includes: pure electric driving conditions, engine and motor coupling conditions, engine driving and charging during driving conditions, braking energy recovery conditions and parking charging conditions, wherein:

[0013] In the pure electric driving condition: the second separation structure is engaged, and the power transmission path is: drive motor-reducer-gear shaft-second separation structure-transmission shaft;

[0014] Under the engine and motor coupling working condition: the first separation mechanism and the second separation structure are both engaged, and the drive motor drives the vehicle to travel together with the engine through the power transmission path under the pure electric driving working condition;

[0015] In the engine-driven and driving charging condition: the first separation mechanism and the second separation structure are both engaged, and the engine drives the vehicle while charging the battery through the drive motor;

[0016] Under the braking energy recovery working condition: the first separation mechanism is disconnected, the second separation structure is engaged, and the engine is not working;

[0017] In the parking charging condition: the first separation mechanism is engaged, the second separation structure 8 is disengaged, and the engine charges the battery through the drive motor.

[0018] As described above, in the commercial vehicle AMT hybrid driving method, preferably, the working states of the first separation mechanism and the second separation structure include a first state, a second state and a third state, wherein:

[0019] In the first state, the first separation mechanism is closed and the second separation structure is closed; it is suitable for coupling the engine and the motor, engine driving and charging during driving;

[0020] In the second state, the first separation mechanism is disconnected and the second separation mechanism is closed; it is suitable for pure electric driving and braking energy recovery;

[0021] In the third state, the first separation mechanism is closed and the second separation mechanism is disconnected; this is suitable for parking charging.

[0022] The commercial vehicle AMT hybrid driving method as described above, wherein preferably, the action sequence relationship between the first state, the second state and the third state of the first separation mechanism and the second separation structure includes: a first action sequence, a second action sequence, a third action sequence, a fourth action sequence, a fifth action sequence and a sixth action sequence,

[0023] Among them: the first action sequence is: first state → second state → third state, the second action sequence is: first state → third state → second state, the third action sequence is: second state → first state → third state, the fourth action sequence is: second state → third state → first state, the fifth action sequence is: third state → first state → second state, the sixth action sequence is: third state → second state → first state,

[0024] The operating condition switching state corresponding to the first action sequence is: charging during engine driving → braking energy recovery → parking charging;

[0025] The operating condition switching state corresponding to the second action sequence is: engine driving, charging while driving → parking charging → pure electric driving;

[0026] The operating condition switching state corresponding to the third action sequence is: pure electric driving→engine and motor coupling→parking and charging;

[0027] The operating condition switching state corresponding to the fourth action sequence is: pure electric driving → parking charging → engine and motor coupling;

[0028] The working condition switching state corresponding to the fifth action sequence is: parking charging→engine and motor coupling→braking energy recovery;

[0029] The operating condition switching state corresponding to the sixth action sequence is: parking and charging→pure electric driving→engine and motor coupling.

[0030] The present invention provides a commercial vehicle AMT hybrid drive system and method. A gear shaft is added to the output shaft of the AMT gearbox to connect with a reducer and a motor. In pure electric working conditions, power is passed through a drive motor-reducer-output shaft, which is simple and efficient, and has high efficiency in pure electric working conditions and braking energy recovery. The power requirements of the whole vehicle such as low-speed heavy load and continuous climbing are met, and the output power of the whole vehicle is good. Since the drive motor and the reducer mechanism are at the rear of the AMT gearbox, they can be made into a separate box, which effectively avoids the influence of engine heat radiation, and the drive motor cooling system can be designed separately. The speed of the drive motor is not affected by the engine speed, and the selection space is large. The motor cooperates with the reduction mechanism to achieve high speed and low torque, so that the motor has higher working efficiency and lower cost. The failure of the P3 module does not affect the use of the vehicle, and the layout is easy to repair. The gear shift setback problem of the AMT can be greatly optimized by adjusting the motor speed. No major changes are made to the original engine and gearbox system. The flexibility is large, the drive motor selection can take into account HEV and PHEV, and the motor and reducer can be adaptively changed when other models are subsequently installed. The development difficulty is small, the development cycle is short, and the cost and development fee are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the current AMT+P2 hybrid technology solution;

[0033] Figure 2 A schematic diagram of the AMT+P3 hybrid technical solution of an embodiment of the commercial vehicle AMT hybrid drive system provided by the present invention;

[0034] Figure 3 It is a schematic diagram of the action sequence relationship of the three states of the first separation mechanism and the second separation mechanism.

[0035] Explanation of the reference numerals: 1-clutch, 2-drive motor (P2 module), 3-AMT gearbox, 4-first release mechanism, 5-gear shaft, 6-reducer, 7-drive motor (P3 module), 8-second release mechanism. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0037] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0039] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0041] like Figure 1As shown in the figure, the current AMT hybrid scheme mostly adopts the P2 scheme, that is, the drive motor 2 (P2 module) is arranged between the engine and the AMT gearbox 3, that is, the engine output end, close to the AMT gearbox 3 side, and there is a clutch 1 between the engine. The disadvantages of this AMT hybrid scheme are: the P2 structure is sandwiched between the gearbox and the engine, the drive motor is very obviously affected by temperature, the high temperature heat radiation of the engine promotes the acceleration of the motor temperature rise, which causes the motor to operate at reduced power, reduce power output, and affect the performance of the power system; and the motor speed is limited by the engine speed, which has high requirements for the drive motor, low speed and high torque, resulting in high cost and low performance, and the AMT gearbox body changes greatly.

[0042] like Figure 2 As shown, the commercial vehicle AMT hybrid drive system provided in this embodiment includes: an AMT gearbox 3, on the output shaft of which a first separation structure (C1) 4, a gear shaft 5 and a second separation structure (C2) 8 are provided, and the gear shaft 5 is connected to a reducer 6 and a drive motor 7.

[0043] The drive motor 7 includes a P3 module. The drive motor includes an HEV type or a PHEV type. Therefore, the selection of the drive motor 7 can take into account both HEV and PHEV, with great flexibility, and the subsequent installation of other models can make adaptive changes to the motor and reducer.

[0044] Further, the gear shaft 5 is disposed between the first separation structure 4 and the second separation structure 8, one end of the gear shaft 5 is connected to the first separation structure 4, and the other end is connected to the second separation structure 8. Specifically, the reducer 6 and the drive motor 7 are connected to the gears on the gear shaft 5, respectively.

[0045] Furthermore, the drive motor 7 and the reducer 6 are located at the rear of the AMT gearbox, and the drive motor 7 and the reducer 6 respectively adopt separate housing designs, which can effectively avoid the influence of engine heat radiation, and the drive motor cooling system can be designed separately.

[0046] The commercial vehicle AMT hybrid drive system provided in this embodiment specifically includes the following steps during actual implementation:

[0047] Pure electric driving conditions, engine and motor coupling conditions, engine driving and charging while driving conditions, braking energy recovery conditions and parking charging conditions, among which:

[0048] In the pure electric driving condition, the second separation structure 8 is engaged, and the power transmission path is: drive motor 7 - reducer 6 - gear shaft 5 - second separation structure 8 - transmission shaft, and the transmission path is short, simple and efficient;

[0049] Under the engine and motor coupling working condition: the first separation mechanism 4 and the second separation mechanism 8 are both engaged, and the drive motor 7 drives the vehicle together with the engine through the power transmission path under the pure electric driving working condition. In this mode, the engine can be adjusted to work in a relatively high efficiency area;

[0050] In the engine-driven and charging-while-driving condition: the first separation mechanism 4 and the second separation mechanism 8 are both engaged, and the engine drives the vehicle while charging the battery through the drive motor 7;

[0051] In the braking energy recovery condition: the first separation mechanism 4 is disconnected, the second separation mechanism 8 is engaged, and the engine is not working;

[0052] In the parking charging condition: the first separation mechanism 4 is engaged, the second separation mechanism 8 is disengaged, and the engine charges the battery through the drive motor 7 .

[0053] The working states of the first separation mechanism 4 and the second separation mechanism 8 include a first state ①, a second state ② and a third state ③, wherein:

[0054] In the first state ①, the first separation mechanism 4 is closed and the second separation mechanism 8 is closed; it is suitable for coupling the engine and the motor, driving the engine and charging during driving;

[0055] In the second state ②, the first separation mechanism 4 is disconnected and the second separation mechanism 8 is closed; it is suitable for pure electric driving and braking energy recovery;

[0056] In the third state ③, the first separation mechanism 4 is closed and the second separation mechanism 8 is disconnected; this is suitable for parking charging.

[0057] Furthermore, if Figure 3 As shown, the action sequence relationship between the first state ①, the second state ② and the third state ③ of the first separation mechanism 4 and the second separation structure 8 includes: a first action sequence, a second action sequence, a third action sequence, a fourth action sequence, a fifth action sequence and a sixth action sequence,

[0058] Among them: the first action sequence is: first state ①→second state ②→third state ③, the second action sequence is: first state ①→third state ③→second state ②, the third action sequence is: second state ②→first state ①→third state ③, the fourth action sequence is: second state ②→third state ③→first state ①, the fifth action sequence is: third state ③→first state ①→second state ②, the sixth action sequence is: third state ③→second state ②→first state ①,

[0059] The operating condition switching state corresponding to the first action sequence is: charging during engine driving → braking energy recovery → parking charging;

[0060] The operating condition switching state corresponding to the second action sequence is: engine driving, charging while driving → parking charging → pure electric driving;

[0061] The operating condition switching state corresponding to the third action sequence is: pure electric driving→engine and motor coupling→parking and charging;

[0062] The operating condition switching state corresponding to the fourth action sequence is: pure electric driving → parking charging → engine and motor coupling;

[0063] The working condition switching state corresponding to the fifth action sequence is: parking charging→engine and motor coupling→braking energy recovery;

[0064] The operating condition switching state corresponding to the sixth action sequence is: parking and charging→pure electric driving→engine and motor coupling.

[0065] The commercial vehicle AMT hybrid drive system and method provided by the embodiment of the present invention adds a gear shaft to the output shaft of the AMT gearbox to connect with the reducer and the motor. In pure electric working conditions, the power passes through the drive motor-reducer-output shaft, which is simple and efficient, and has high efficiency in pure electric working conditions and braking energy recovery. It meets the power requirements of the whole vehicle such as low speed and heavy load and continuous climbing, and the output power of the whole vehicle is good. Since the drive motor and the reducer mechanism are at the rear of the AMT gearbox, they can be made into a separate box, which effectively avoids the influence of engine heat radiation, and the drive motor cooling system can be designed separately. The speed of the drive motor is not affected by the engine speed, and the selection space is large. The motor cooperates with the reduction mechanism to achieve high speed and low torque, so that the motor has higher working efficiency and lower cost. A failure in the P3 module will not affect the use of the vehicle, and the layout is easy to maintain; the AMT's gear shifting problem can be greatly optimized through motor speed regulation; no major changes are made to the original engine and transmission system; it is highly flexible, and the drive motor selection can take into account both HEV and PHEV, and the subsequent installation of other models can make adaptive changes to the motor and reducer; it has low development difficulty, short development cycle, and low cost and development fee.

[0066] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0067] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A commercial vehicle AMT hybrid drive system, characterized in that: include: An AMT gearbox, wherein a first separation structure, a gear shaft and a second separation structure are arranged on the output shaft of the AMT gearbox, and the gear shaft is connected with a reducer and a drive motor.

2. The commercial vehicle AMT hybrid drive system according to claim 1, characterized in that: The drive motor includes a P3 module.

3. The commercial vehicle AMT hybrid drive system according to claim 1, characterized in that: The gear shaft is disposed between the first separation structure and the second separation structure, one end of the gear shaft is connected to the first separation structure, and the other end of the gear shaft is connected to the second separation structure.

4. The commercial vehicle AMT hybrid drive system according to claim 1, characterized in that: The speed reducer and the driving motor are respectively connected to the gears on the gear shaft.

5. The commercial vehicle AMT hybrid drive system according to claim 1, characterized in that: The driving motor includes an HEV type or a PHEV type.

6. The commercial vehicle AMT hybrid drive system according to claim 1, characterized in that: The drive motor and the reducer are located at the rear of the AMT gearbox, and the drive motor and the reducer are respectively designed with separate housings.

7. A commercial vehicle AMT hybrid driving method using the system according to any one of claims 1 to 6, characterized in that: include: Pure electric driving conditions, engine and motor coupling conditions, engine driving and charging while driving conditions, braking energy recovery conditions and parking charging conditions, among which: In the pure electric driving condition: the second separation structure is engaged, and the power transmission path is: drive motor-reducer-gear shaft-second separation structure-transmission shaft; Under the engine and motor coupling working condition: the first separation mechanism and the second separation structure are both engaged, and the drive motor drives the vehicle to travel together with the engine through the power transmission path under the pure electric driving working condition; In the engine-driven and driving charging condition: the first separation mechanism and the second separation structure are both engaged, and the engine drives the vehicle while charging the battery through the drive motor; Under the braking energy recovery working condition: the first separation mechanism is disconnected, the second separation structure is engaged, and the engine is not working; In the parking charging condition: the first separation mechanism is engaged, the second separation structure 8 is disengaged, and the engine charges the battery through the drive motor.

8. The commercial vehicle AMT hybrid driving method according to claim 7, characterized in that: The working states of the first separation mechanism and the second separation structure include a first state, a second state and a third state, wherein: In the first state, the first separation mechanism is closed and the second separation structure is closed; it is suitable for coupling the engine and the motor, engine driving and charging during driving; In the second state, the first separation mechanism is disconnected and the second separation mechanism is closed; it is suitable for pure electric driving and braking energy recovery; In the third state, the first separation mechanism is closed and the second separation mechanism is disconnected; this is suitable for parking charging.

9. The commercial vehicle AMT hybrid driving method according to claim 8, characterized in that: The action sequence relationship between the first state, the second state and the third state of the first separation mechanism and the second separation structure includes: a first action sequence, a second action sequence, a third action sequence, a fourth action sequence, a fifth action sequence and a sixth action sequence, Among them: the first action sequence is: first state → second state → third state, the second action sequence is: first state → third state → second state, the third action sequence is: second state → first state → third state, the fourth action sequence is: second state → third state → first state, the fifth action sequence is: third state → first state → second state, the sixth action sequence is: third state → second state → first state, The operating condition switching state corresponding to the first action sequence is: charging during engine driving → braking energy recovery → parking charging; The operating condition switching state corresponding to the second action sequence is: engine driving, charging while driving → parking charging → pure electric driving; The operating condition switching state corresponding to the third action sequence is: pure electric driving→engine and motor coupling→parking and charging; The operating condition switching state corresponding to the fourth action sequence is: pure electric driving → parking charging → engine and motor coupling; The working condition switching state corresponding to the fifth action sequence is: parking charging→engine and motor coupling→braking energy recovery; The operating condition switching state corresponding to the sixth action sequence is: parking and charging→pure electric driving→engine and motor coupling.

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