阅读说明：本技术 一种混合动力汽车bsg系统皮带松紧度智能调节装置 (Intelligent belt tightness adjusting device for BSG system of hybrid electric vehicle ) 是由 朱浩 赵宇博 朱军 罗旭 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种混合动力汽车BSG系统皮带松紧度智能调节装置,包括BSG系统和皮带松紧度控制系统,本设计根据发动机实际工作状态(启动、静止和正常工作)通过张力控制器将BSG系统最小带段张力设置为两档,既保证了混合动力汽车不同工况下对带段张力的不同需求,又能根据需要智能切换挡位,且响应速度快。采用本设计方案的BSG系统只有在汽车启动阶段处于较大张力水平,而在汽车静止和正常行驶的大部分时间段均处于较小张力水平,有助于提高皮带使用寿命。(The invention discloses an intelligent belt tightness adjusting device for a BSG system of a hybrid electric vehicle, which comprises the BSG system and a belt tightness control system. The BSG system adopting the design scheme is only in a larger tension level at the automobile starting stage, and is in a smaller tension level at most of the time periods of the automobile in a static state and normal running state, and the service life of the belt is prolonged.)

1. The utility model provides a hybrid vehicle BSG system belt elasticity intelligent regulation device which characterized in that: the belt tightness control system comprises a BSG system and a belt tightness control system.

2. The intelligent belt tightness adjusting device for the BSG system of the hybrid electric vehicle as claimed in claim 1, wherein: the BSG system mainly comprises a crankshaft belt wheel (1), a V-ribbed belt (6), an air conditioner compressor belt wheel (2), a BSG motor belt wheel (4), an automatic tensioner (5) and an idler wheel (3), wherein the automatic tensioner (5) and the idler wheel (3) are respectively arranged on belt sections on two sides of the BSG motor belt wheel (4) and used for adjusting belt tension, the automatic tensioner (5) is arranged between the crankshaft belt wheel (1) and the BSG motor belt wheel (4), and the idler wheel (3) is arranged between the air conditioner compressor belt wheel (2) and the BSG motor belt wheel (4);

the belt tightness control system is composed of a BSG control computer (HCU) (8), a BSG motor (12), a BSG storage battery (10), a tension controller (14), an actuator (7), an engine (9) and a plurality of sensors (including an engine speed sensor, a clutch position switch, a neutral position switch, a brake vacuum degree sensor, a current flow sensor and the like), wherein the sensors can fully utilize related sensors in the existing engine control system of the hybrid electric vehicle, so that the cost is saved, and the feasibility is improved.

3. The intelligent belt tightness adjusting device for the BSG system of the hybrid electric vehicle as claimed in claims 1-2, wherein: the belt tension is realized by that a belt tightness control system controls an actuator (7) to push an idler pulley (3) to move to a target position; according to the working conditions (starting, stopping and normal operation) of the rotating speed of the engine, the tension of the minimum belt section of the BSG system is set to be two gears, namely a first gear tension and a second gear tension, through a tension controller (14), and intelligent switching is performed; the first gear tension and the second gear tension are respectively provided by the automatic tensioner (5) and the idler pulley (3) in a matching way, and the first gear tension is smaller than the second gear tension; the idler gear is in a first gear position and a second gear position corresponding to the first gear tension and the second gear tension, respectively.

4. The intelligent belt tightness adjusting device for the BSG system of the hybrid electric vehicle as claimed in claim 3, wherein: when the vehicle is at rest, the BSG system uses a first gear belt tension, provided by an automatic tensioner (5) with an initial torque, when the idler pulley 3 is away from the belt segment to which it is attached and in a first gear position;

when the engine is started, the BSG motor (12) is used as a power source, the engine (9) and the air-conditioning compressor (2) are used as loads, and particularly, the load torque is large when the engine (12) is used as the load, so that the starting efficiency of the engine is ensured not to be influenced and safety accidents are avoided due to the fact that large belt tension is needed; at the moment, the belt section of the BSG motor belt wheel (4) close to one side of the idle wheel (3) is a loose edge, so that the situation that the sliding cannot occur can be ensured only by ensuring that the tension of the loose edge is large enough; under the working condition, the belt tension of a second gear is larger, and the idler pulley moves from the first gear position to the second gear position;

when the rotating speed of the engine reaches above the idling speed, the HCU (8) sends an instruction to start the engine (9), the BSG motor (12) stops providing power from the beginning, the engine (9) continues to provide power, the BSG motor (12) enters a charging stage, a 48V lithium battery (10) is charged through a Battery Management System (BMS), meanwhile, loose edges in belt sections on two sides of the BSG motor (12) become belt sections close to the automatic tensioner (5), and tight edges become belt sections close to one side of the idle wheel (3); under such conditions, the system is less loaded, so a first gear belt tension is used, and the tension controller (14) controls the actuator (7) to push the idler pulley (3) back to the original first gear position, at which time the minimum belt tension of the BSG system is instead provided by the automatic tensioner (5).

5. The intelligent belt tightness adjusting device for the BSG system of the hybrid electric vehicle as claimed in claim 4, wherein: a pressure sensor is arranged between the actuator (7) and the idler pulley (3) to measure the belt tension in real time, and the belt tension is intelligently fed back to the tension controller (14) so as to realize the function of continuously and adaptively adjusting the belt tension.

Technical Field

The invention relates to the technical field of automobile engines, in particular to an intelligent belt tightness adjusting device for a BSG system of a hybrid electric vehicle.

Background

With the development of automobile industry in China and the implementation of stricter regulations for energy conservation and emission reduction, new energy automobiles with low emission and even zero emission are more and more favored. Among many new energy automobile solutions, the hybrid electric vehicle has been successfully industrialized. Micro-hybrid powertrain systems having belt driven integrated starter/generators (i.e., BSGs) have become increasingly popular for use in small displacement vehicles such as passenger cars. Unlike conventional engine accessory drive systems, BSG-containing automotive accessory drive systems (i.e., BSG systems) use a reversible electric machine that integrates start/generate functions instead of a conventional generator. When an automobile containing a BSG system encounters a red light or traffic jam, the ignition system or the fuel injection system can be automatically closed, and the engine stops running at the moment; when the automobile starts, the BSG motor is used for rapidly dragging the engine to rotate above the idling speed through belt transmission, then the engine is sprayed with oil and ignited, so that the engine is started and enters a normal running state. Therefore, when the BSG motor is started and normally works, the elastic edges of the left belt and the right belt are exchanged. In order to ensure quick correspondence when the elastic edges at two sides of the reversible motor are exchanged under different working states, the BSG system is provided with an automatic tensioner comprising two swing arms at two sides of the BSG motor. However, since the engine is started by the BSG motor, which is a load greater than the sum of the other engine accessory drive systems, it is desirable to have sufficient belt tension to avoid belt slip and to ensure that the engine can start properly and quickly. Therefore, although the design scheme that the automatic tensioner comprising the two swing arms is arranged on the two sides of the BSG motor can ensure that the serious slipping phenomenon can not occur when the engine is started, the belt tension can be increased when the automobile accessory transmission system works normally; the engine is in a normal working state or a stop state most of the time, which means that the automobile accessory transmission system is always in a high-tension state, the service life of the belt is greatly shortened, the use and maintenance cost is increased, and meanwhile, certain potential safety hazards also exist. Moreover, the design method is rough, and the tension of the belt section of the system containing the BSG can not be ensured to be in the optimal level under different working states.

Disclosure of Invention

The invention aims to design an intelligent belt tightness adjusting device for a BSG system of a hybrid electric vehicle, which can intelligently adjust the belt tightness according to the running states (including three running states of starting, stopping and normal running) of an engine; compared with the existing design, the design can ensure normal and efficient work of the automobile accessory transmission system containing the BSG, and can also greatly prolong the service life of the belt.

Specifically, the method comprises the following technical scheme:

the utility model provides a hybrid vehicle BSG system belt elasticity intelligent regulation device, includes BSG system and belt elasticity control system, the BSG system includes bent axle band pulley, polywedge bet, air condition compressor band pulley, BSG motor band pulley, automatic tensioning ware and idler, its characterized in that:

the automatic tensioner is disposed between the crankshaft pulley and the BSG motor pulley.

The idler pulley is disposed between the air conditioner compressor pulley and the BSG motor pulley.

The BSG system of the hybrid electric vehicle can be powered by a crankshaft belt wheel, an air conditioner compressor belt wheel and a BSG motor belt wheel are driven to move by a poly V-belt, and an engine and an air conditioner compressor can be driven by a BSG motor.

The belt tightness control system mainly comprises sensors and components such as a BSG control computer (HCU), a BSG motor, a BSG storage battery, an engine rotating speed sensor, a clutch position switch, a neutral position switch, a brake vacuum degree sensor, a current flow sensor and the like. The sensors and components can utilize the existing sensors and components of the engine control system, so that additional arrangement is not needed.

Specifically, the HCU judges the running condition of the whole automobile by receiving signals of various sensors, and when the automobile runs normally, the BSG motor is used as a generator to generate electricity;

preferably, the operating state of the vehicle is determined from the engine speed sensor data. When the automobile is judged to be in the idle running working condition, the HCU can realize the stop of the engine according to the stop condition (such as brake treading), and can also be manually stopped when special conditions such as traffic lights, particularly long-time traffic jam and the like are met, so that the traditional idle working condition is replaced, and the aims of saving oil and reducing emission are realized;

when a driver tries to drive, the HCU automatically sends a starting instruction according to judgment conditions (such as clutch position and gear switch data) to start the BSG motor and rapidly drag the rotating speed of the engine to a speed higher than an idle speed, the engine is ignited again and started smoothly at the moment, the starting time is shorter than the traditional starting time (generally, the starting can be completed within 1 second), the starting efficiency is improved, and therefore emission pollution during starting is reduced.

The belt tightness control system sets the minimum tension of the belt of the BSG system to be two gears, namely a first gear tension and a second gear tension according to the working conditions (starting, stopping and normal operation) of the rotating speed of the engine, wherein the first gear tension is smaller than the second gear tension; the idler gear is in a first gear position and a second gear position corresponding to the first gear tension and the second gear tension, respectively.

Preferably, the belt tension is provided by a tensioner and an idler pulley in combination, wherein the first gear tension of the belt is provided entirely by the tensioner and the second gear tension of the belt is provided primarily by the idler pulley.

When the vehicle is at rest, the BSG system employs a first gear belt tension, provided by an automatic tensioner with an initial torque, at which time the idler pulley is far from the belt segment and in the first gear position.

When the engine is started, the BSG motor is used as a power source, the engine and the air conditioner are used as loads, and particularly the load torque of the engine as the load is large, so that the starting efficiency of the engine is ensured not to be influenced by the problems of slippage and the like due to the requirement of large belt tension. Under the working condition, the belt section of the BSG belt wheel close to one side of the idler wheel is a loose edge, so that the situation that the belt does not slip can be ensured only by ensuring that the tension of the loose edge is large enough; therefore, the second gear belt tension is adopted, and the belt tension controller controls the idler pulley to rapidly move from the first gear position to the second gear position through the actuator.

Preferably, the second stop belt tension is realized by the belt tightness control system controlling the actuator to push the idler pulley to move to the target position;

preferably, a pressure sensor can be arranged between the actuator and the idler pulley to measure the belt tension in real time, and the intelligent feedback is fed back to the controller, so that the continuous self-adaptive adjustment of the belt tension is realized.

When the rotating speed of the engine reaches above the idling speed, the HCU sends an instruction to start the engine, the BSG motor is started to stop providing power from the beginning, the engine continues to provide power, the BSG motor enters a charging stage and charges a 48V lithium battery through a Battery Management System (BMS), meanwhile, loose edges in belt segments on two sides of the BSG motor become belt segments close to the automatic tensioner, and tight edges become belt segments on one side close to an idler wheel. Under such conditions, the system is less loaded, and therefore, with a first gear belt tension, the belt tension controller controls the actuator to urge the idler pulley back to the second gear position (i.e., the position at which the vehicle is at rest), at which point the minimum belt tension of the system is instead provided by the automatic tensioner.

The beneficial effect of this kind of design lies in: compare the traditional design scheme who adopts the automatic tensioning ware that contains two swing arms, this design divide into two according to engine actual operating condition with belt tension and keep off, had both guaranteed the different demands of taking the section of strip tension under the hybrid vehicle different work condition, and can switch as required intelligence, quick response. More importantly, the BSG system adopting the design scheme is only at a larger tension level in the starting stage of the automobile and at a smaller tension level in the static and normal driving stages of the automobile, so that the service life of the belt is prolonged.

Drawings

Fig. 1 shows the BSG system belt tension and idler position when the vehicle is stopped or traveling normally.

FIG. 2 illustrates BSG system belt tension and idler position at vehicle start-up.

Wherein: 1. a crankshaft pulley; 2. an air conditioner compressor pulley; 3. an idler pulley; 4. a BSG motor; 5. an automatic tensioner; 6. a V-ribbed belt; 7. and an actuator.

Detailed Description

The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:

referring to fig. 1 and 2, the intelligent belt tightness adjusting device for the BSG system of the hybrid electric vehicle comprises a BSG system and a belt tightness control system.

The BSG system mainly comprises a crankshaft belt wheel 1, a V-belt 6, an air conditioner compressor belt wheel 2, a BSG motor belt wheel 4, an automatic tensioner 5 and an idler wheel 3, wherein the automatic tensioner 5 and the idler wheel 3 are respectively arranged on two side belt sections of the BSG motor belt wheel 4 and used for adjusting belt tension, the automatic tensioner 5 is arranged between the crankshaft belt wheel 1 and the BSG motor belt wheel 4, and the idler wheel 3 is arranged between the air conditioner compressor belt wheel 2 and the BSG motor belt wheel 4.

The belt tightness control system is composed of a BSG control computer (HCU)8, a BSG motor 12, a BSG storage battery 10, a tension controller 14, an actuator 7, an engine 9 and a plurality of sensors (including an engine speed sensor, a clutch position switch, a neutral position switch, a brake vacuum degree sensor, a current flow sensor and the like), wherein the sensors can fully utilize related sensors in the existing engine control system of the hybrid electric vehicle, so that the cost is saved, and the feasibility is improved.

The HCU 8 judges the running condition of the whole vehicle by receiving signals of all sensors, and preferably, automatically judges the running state of the vehicle according to the data of the engine speed sensor and the data of other sensors.

When the automobile is judged to be in normal running or braking, the BSG motor 12 is used as a generator to generate electricity, and the BSG storage battery 10 stores electric energy;

when the automobile is judged to be in the idle running working condition, the HCU 8 can realize the stop of the engine 9 according to the stop conditions (such as brake treading, clutch and the like), and can also artificially stop when meeting special conditions such as traffic lights, particularly long-time traffic jam and the like, so as to replace the traditional idle working condition, thereby realizing the purposes of saving oil and reducing emission;

when a driver tries to drive, the HCU 8 automatically sends a starting instruction according to judgment conditions (such as clutch position and gear switch data) to start the BSG motor 12 and rapidly drag the engine rotating speed to a speed higher than the idle speed, the engine 9 is re-ignited and started smoothly at the moment, the starting time is shorter than the traditional starting time (generally, the starting can be completed within 1 second), the starting efficiency is greatly improved, and therefore emission pollution during starting is reduced.

With reference to the embodiment, the belt tightness control system specifically describes the tension adjustment of the belt segment of the BSG system as follows:

according to the working conditions of the engine speed (starting, stopping and normal operation), the minimum belt segment tension of the BSG system is set to be two gears, namely a first gear tension and a second gear tension through the tension controller 14, the first gear tension and the second gear tension are intelligently switched, the first gear tension and the second gear tension are respectively provided by the automatic tensioner 5 and the idler wheel 3, and the first gear tension is smaller than the second gear tension.

The idler gear is in a first gear position and a second gear position corresponding to the first gear tension and the second gear tension, respectively.

When the vehicle is at rest (as shown in fig. 1), the BSG system employs a first gear belt tension, provided by an automatic tensioner 5 having an initial torque, with the idler pulley 3 in the first gear position and out of contact with its adjacent belt segment.

When the engine is started (as shown in fig. 2), at this time, the BSG motor 12 is used as a power source, the engine 9 and the air conditioner compressor 2 are used as loads, and particularly, the load torque is large when the engine 12 is used as a load, so that a large belt tension is required to ensure that the problems such as slipping and the like do not occur, which affect the starting efficiency of the engine, and thus a safety accident is caused. Under this kind of operating mode, the band section that is close to idler 3 one side of BSG motor band pulley 4 is the slack side, consequently only needs to guarantee that the tension of this slack side is enough can ensure not to appear skidding, consequently adopts bigger second to keep off belt tension.

Preferably, second gear belt tension is achieved by the belt tension control 14 of the belt tightness control system controlling the actuator 7 to urge the idler pulley 3 from the first gear position to the second gear position.

And preferably, a pressure sensor can be arranged between the actuator 7 and the idler pulley 3 to measure the belt tension in real time, and the belt tension is intelligently fed back to the tension controller 14, so that the function of continuously and adaptively adjusting the belt tension is realized.

When the engine speed reaches above the idle speed, the HCU 8 sends an instruction to start the engine 9, from which point the BSG motor 12 stops providing power, the engine 9 continues to provide power, and the BSG motor 12 enters a charging stage to charge the 48V lithium battery 10 through a Battery Management System (BMS), and at the same time, the slack side of the belt sections on both sides of the BSG motor 12 becomes a belt section near the automatic tensioner 5 and the tight side becomes a belt section near one side of the idle pulley 3. In this condition, the load on the system is low, so that the first gear belt tension is adopted, and the actuator 7 is controlled by the tension controller 14 to push the idler pulley 3 to return to the first gear position, and the minimum belt tension of the BSG system is provided by the automatic tensioner 5 instead, and the tension state of the belt section of the BSG system is shown in fig. 1.

Preferably, the actuator 14 may be a linear motor.

This design is divided into two according to engine actual operating condition with belt tension level and is kept off, has both guaranteed the different demands to take section tension under the hybrid vehicle different work condition, again can switch as required intelligence, and response speed is fast. More importantly, the BSG system adopting the design scheme is at a larger tension level only in the starting stage of the automobile and at a smaller tension level in most of the time periods of the automobile in a static state and in a normal running state, so that the service life of the belt is prolonged.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.