阅读说明：本技术 一种车辆辅助启动系统及方法 (Vehicle auxiliary starting system and method ) 是由 边淑伟 熊冰 于 2020-03-04 设计创作，主要内容包括：本发明涉及一种车辆辅助启动方法,包括以下步骤：判断所述车辆是否处于停机滑行状态,当所述车辆处于停机滑行状态,则判断油门踏板或刹车是否踩下；当油门踏板或刹车踩下,则判断BSG电机或启动电机是否能够启动发动机；当BSG电机和启动电机均不能启动发动机,则控制双离合器自动变速器预挂能够启动发动机的最高挡位,并控制与该最高挡位对应的离合器吸合以启动所述发动机。实施本发明的辅助启动方法,可解决在BSG电机和起动电机均不能正常工作的情况下停机滑行车辆无法再次启动的问题。(The invention relates to a vehicle auxiliary starting method, which comprises the following steps: judging whether the vehicle is in a stop sliding state, and judging whether an accelerator pedal or a brake is stepped down when the vehicle is in the stop sliding state; when an accelerator pedal or a brake is stepped on, judging whether the BSG motor or the starting motor can start the engine or not; when the BSG motor and the starting motor can not start the engine, the dual-clutch automatic transmission is controlled to pre-engage the highest gear capable of starting the engine, and the clutch corresponding to the highest gear is controlled to be attracted so as to start the engine. The auxiliary starting method can solve the problem that the vehicle can not be restarted when the BSG motor and the starting motor can not work normally.)

1. A vehicle starting assist system, the vehicle including an engine, a dual clutch automatic transmission, a BSG motor and a starter motor, the BSG motor and the starter motor being respectively used to start the engine, the starting assist system comprising:

the system comprises a shutdown and sliding state judging module, a driving action judging module and a driving action judging module, wherein the shutdown and sliding state judging module is used for judging whether the vehicle is in a shutdown and sliding state or not;

the driving action judging module is used for judging whether an accelerator pedal or a brake is in a treading state, and when the accelerator pedal or the brake is in the treading state, the motor state judging module is triggered;

the motor state judging module is used for judging whether the BSG motor or the starting motor can start the engine or not, and when the BSG motor and the starting motor cannot start the engine, the automatic transmission control module is triggered;

and the automatic transmission control module is used for controlling the double-clutch automatic transmission to pre-engage the highest gear capable of starting the engine and controlling the clutch corresponding to the highest gear to be attracted so as to start the engine.

2. The vehicle auxiliary starting system according to claim 1, wherein the automatic transmission control module comprises a gear control submodule for calculating a highest gear capable of starting the engine and controlling a gear to be engaged according to a current vehicle speed and a starting speed of the engine.

3. The vehicle auxiliary starting system according to claim 1, wherein the motor state judgment module comprises:

the BSG motor state judgment submodule is used for judging whether the BSG motor can start the engine or not, and when the BSG motor cannot start the engine, the BSG motor state judgment submodule is triggered to start the motor;

and the starting motor state judgment submodule is used for judging whether the starting motor can start the engine or not, and triggering the automatic transmission control module when the starting motor cannot start the engine.

4. The vehicle auxiliary starting system of claim 3 wherein the BSG motor state judgment submodule comprises: the first voltage detection unit is used for detecting the discharge voltage of the first power storage battery pack; the first relay detection unit is used for detecting whether the BSG motor relay acts or not;

the starting motor state judgment submodule comprises: the second voltage detection unit is used for detecting the discharge voltage of the second power storage battery pack; and the second relay detection unit is used for detecting whether the starting motor relay acts or not.

5. A vehicle assisted starting method, comprising the steps of:

judging whether the vehicle is in a stop sliding state, and judging whether an accelerator pedal or a brake is stepped down when the vehicle is in the stop sliding state;

when an accelerator pedal or a brake is stepped on, judging whether the BSG motor or the starting motor can start the engine or not;

when the BSG motor and the starting motor can not start the engine, the dual-clutch automatic transmission is controlled to pre-engage the highest gear capable of starting the engine, and the clutch corresponding to the highest gear is controlled to be attracted so as to start the engine.

6. The vehicle auxiliary starting method according to claim 5, wherein when neither the BSG motor nor the starter motor can start the engine, the highest gear capable of starting the engine is calculated according to the current vehicle speed and the starting speed of the engine, and the gear shifting is controlled.

7. The vehicle assisted starting method according to claim 5, characterized by further comprising the steps of:

and judging whether the dual-clutch automatic transmission starts the engine or not, controlling the pre-engaged running target gear when the engine is in an ignition running state, and controlling the clutch corresponding to the running target gear to be attracted when the rotating speed of the engine reaches above the target shaft speed so as to recover the running of the gear.

8. The vehicle auxiliary starting method according to claim 5, wherein the step of determining whether the BSG motor or the starter motor can start the engine is:

and judging whether the BSG motor can start the engine or not, and judging whether the starting motor can start the engine or not when the BSG motor cannot start the engine.

9. The vehicle auxiliary starting method as claimed in claim 5, wherein the method for judging whether the BSG motor can start the engine is as follows: detecting the discharge voltage of the first power storage battery pack and a BSG motor relay, and judging that the BSG motor cannot start the engine when the discharge voltage is lower than a preset value or the BSG motor relay does not act;

the method for judging whether the starting motor can start the engine comprises the following steps: and detecting the discharge voltage of the second power storage battery pack and detecting a starting motor relay, and when the discharge voltage is lower than a preset value or the starting motor relay does not act, judging that the starting motor cannot start the engine.

10. The vehicle auxiliary starting method according to claim 5, wherein the method for judging whether the vehicle is in the stop-slide state comprises the following steps:

judging the running state of an engine, and judging that the engine is in a stop state when the rotating speed of the engine is zero;

judging the sliding state of the vehicle, and judging that the vehicle is in the sliding state when the accelerator pedal or the brake is not stepped and the vehicle runs;

and when the engine is in a stop state and the vehicle is in a sliding state, judging that the vehicle is in the stop sliding state.

Technical Field

The invention relates to the technical field of BSG hybrid electric vehicles, in particular to a vehicle auxiliary starting system and a vehicle auxiliary starting method.

Background

When the traditional power automobile waits for the red light and is locked up, if the driver does not actively extinguish the engine, the idle running of the engine can cause energy waste and environmental pollution, in order to improve the fuel efficiency and reduce the environmental pollution, as shown in the attached drawing 1, the traditional power automobile optimizes the parking working condition by additionally installing a BSG system, thereby realizing the suspension work of the engine of the automobile before the red light and in the process of locking up, when the automobile recognizes that the driver has the starting intention, the system quickly starts the engine through the BSG system, and the oil consumption, the emission and the noise of the engine in the idle work process are also eliminated.

Besides the parking working conditions, when the speed of the hybrid electric vehicle carrying the BSG system reaches a certain threshold value and a driver does not step on a brake and releases an accelerator, the engine management system judges that the current vehicle meets the engine stop condition, controls the engine to stop working, and controls the vehicle to slide so as to achieve the oil saving effect. When the driver steps on the accelerator, the BSG motor or the starting motor starts the engine, and the clutch is combined, so that the vehicle can run in an accelerated manner.

Because the engine is restarted by the power supply of the BSG motor or the starting motor after being stopped, when the BSG motor and the starting motor can not work normally, the engine can not be restarted in the sliding process, and safety accidents are easily caused. On the other hand, the vacuum source of the vacuum booster is from the manifold of the engine, and once the engine cannot be restarted, the vacuum booster loses the vacuum source and the brake pedal force becomes large, so that the vehicle brake becomes very dangerous.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a vehicle auxiliary starting system and method, which can solve the problem that a vehicle cannot be restarted when a BSG motor and a starter motor are not working normally.

The invention provides a vehicle auxiliary starting system, wherein the vehicle comprises an engine, a double-clutch automatic transmission, a BSG motor and a starting motor, the BSG motor and the starting motor are respectively used for starting the engine, and the auxiliary starting system comprises: the system comprises a shutdown and sliding state judging module, a driving action judging module and a driving action judging module, wherein the shutdown and sliding state judging module is used for judging whether the vehicle is in a shutdown and sliding state or not; the driving action judging module is used for judging whether an accelerator pedal or a brake is in a treading state, and when the accelerator pedal or the brake is in the treading state, the motor state judging module is triggered; the motor state judging module is used for judging whether the BSG motor or the starting motor can start the engine or not, and when the BSG motor and the starting motor cannot start the engine, the automatic transmission control module is triggered; and the automatic transmission control module is used for controlling the double-clutch automatic transmission to pre-engage the highest gear capable of starting the engine and controlling the clutch corresponding to the highest gear to be attracted so as to start the engine.

Further, the automatic transmission control module comprises a gear control submodule, and the gear control submodule is used for calculating the highest gear capable of starting the engine according to the current vehicle speed and the starting rotating speed of the engine and controlling gear engagement.

Further, the motor state judgment module includes: the BSG motor state judgment submodule is used for judging whether the BSG motor can start the engine or not, and when the BSG motor cannot start the engine, the BSG motor state judgment submodule is triggered to start the motor; and the starting motor state judgment submodule is used for judging whether the starting motor can start the engine or not, and triggering the automatic transmission control module when the starting motor cannot start the engine.

Further, the BSG motor state judgment submodule includes: the first voltage detection unit is used for detecting the discharge voltage of the first power storage battery pack; the first relay detection unit is used for detecting whether the BSG motor relay acts or not; the starting motor state judgment submodule comprises: the second voltage detection unit is used for detecting the discharge voltage of the second power storage battery pack; and the second relay detection unit is used for detecting whether the starting motor relay acts or not.

The second aspect of the present invention provides a vehicle auxiliary starting method, including the steps of: judging whether the vehicle is in a stop sliding state, and judging whether an accelerator pedal or a brake is stepped down when the vehicle is in the stop sliding state; when an accelerator pedal or a brake is stepped on, judging whether the BSG motor or the starting motor can start the engine or not; when the BSG motor and the starting motor can not start the engine, the dual-clutch automatic transmission is controlled to pre-engage the highest gear capable of starting the engine, and the clutch corresponding to the highest gear is controlled to be attracted so as to start the engine.

Further, when the BSG motor and the starting motor can not start the engine, the highest gear capable of starting the engine is calculated according to the current vehicle speed and the starting rotating speed of the engine, and gear engagement is controlled.

Further, the method also comprises the following steps: and judging whether the dual-clutch automatic transmission starts the engine or not, controlling the pre-engaged running target gear when the engine is in an ignition running state, and controlling the clutch corresponding to the running target gear to be attracted when the rotating speed of the engine reaches above the target shaft speed so as to recover the running of the gear.

Further, the step of judging whether the BSG motor or the starter motor can start the engine is: and judging whether the BSG motor can start the engine or not, and judging whether the starting motor can start the engine or not when the BSG motor cannot start the engine.

Further, the method for judging whether the BSG motor can start the engine comprises the following steps: detecting the discharge voltage of the first power storage battery pack and a BSG motor relay, and judging that the BSG motor cannot start the engine when the discharge voltage is lower than a preset value or the BSG motor relay does not act; the method for judging whether the starting motor can start the engine comprises the following steps: and detecting the discharge voltage of the second power storage battery pack and detecting a starting motor relay, and when the discharge voltage is lower than a preset value or the starting motor relay does not act, judging that the starting motor cannot start the engine.

Further, the method for judging whether the vehicle is in the stop sliding state comprises the following steps: judging the running state of an engine, and judging that the engine is in a stop state when the rotating speed of the engine is zero; judging the sliding state of the vehicle, and judging that the vehicle is in the sliding state when the accelerator pedal or the brake is not stepped and the vehicle runs; and when the engine is in a stop state and the vehicle is in a sliding state, judging that the vehicle is in the stop sliding state.

Due to the technical scheme, the invention has the following beneficial effects:

during the vehicle is stopped and slides, when the BSG motor and the starting motor can not drive the engine to start, the vehicle auxiliary starting system selects a proper gear and controls the clutch to suck through controlling the automatic transmission, and the engine is reversely dragged to start, so that the problem that the stopped and sliding vehicle can not be restarted under the condition that the BSG motor and the starting motor can not work normally is solved.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic diagram of a prior art BSG hybrid vehicle;

FIG. 2 is a flowchart of a vehicle assisted starting method according to an embodiment of the present invention;

fig. 3 is a working condition diagram of a vehicle auxiliary starting method according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.