CN111923909A - Automatic parking control system and control method for automatic transmission vehicle - Google Patents

Automatic parking control system and control method for automatic transmission vehicle Download PDF

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Publication number
CN111923909A
CN111923909A CN202010640315.8A CN202010640315A CN111923909A CN 111923909 A CN111923909 A CN 111923909A CN 202010640315 A CN202010640315 A CN 202010640315A CN 111923909 A CN111923909 A CN 111923909A
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CN
China
Prior art keywords
state
automatic parking
vehicle
automatic
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010640315.8A
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Chinese (zh)
Inventor
李定国
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Nanjing Hanxiyue Automation Technology Co Ltd
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Nanjing Hanxiyue Automation Technology Co Ltd
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Application filed by Nanjing Hanxiyue Automation Technology Co Ltd filed Critical Nanjing Hanxiyue Automation Technology Co Ltd
Priority to CN202010640315.8A priority Critical patent/CN111923909A/en
Publication of CN111923909A publication Critical patent/CN111923909A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
    • B60W30/18Propelling the vehicle
    • B60W30/18009Propelling the vehicle related to particular drive situations
    • B60W30/18109Braking
    • B60W30/18118Hill holding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • B60W10/182Conjoint control of vehicle sub-units of different type or different function including control of braking systems including control of parking brakes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00Input parameters relating to occupants
    • B60W2540/10Accelerator pedal position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00Input parameters relating to occupants
    • B60W2540/12Brake pedal position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00Input parameters relating to occupants
    • B60W2540/16Ratio selector position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2552/00Input parameters relating to infrastructure
    • B60W2552/15Road slope
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/06Combustion engines, Gas turbines
    • B60W2710/0666Engine torque
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/18Braking system
    • B60W2710/186Status of parking brakes

Abstract

The invention discloses an automatic parking control system and a control method of an automatic transmission vehicle, which comprises a detection module, a sensor module, an automatic transmission control unit, an engine control unit and a judgment module, wherein the detection module is respectively connected with the sensor module, the automatic transmission control unit, the engine control unit and the judgment module through a CAN bus, and the automatic parking holding system is divided into a closing state, a standby state, a working state, a releasing state and a connecting state; has the advantages that: each condition accords with the operation habits of most drivers, and the drivers can clearly understand and adapt to the action of the control system, so that the control system has good user interactivity and usability; in the automatic parking function starting judgment, conditions of closing the door of a driver and fastening a safety belt of the driver are added, and the driver is prohibited from using an automatic parking system under the condition that the safety of the driver is not guaranteed; and monitoring the pressure maintaining time in the automatic parking pressure maintaining process to prevent the system components from being burnt.

Description

Automatic parking control system and control method for automatic transmission vehicle
Technical Field
The invention relates to the technical field of automobile brake control, in particular to an automatic parking control system and method for an automatic transmission vehicle.
Background
Along with the rapid development of automobile intellectualization, the application of various novel automobile electronic systems on the vehicle is more and more abundant, and various large host computer factories match multiple electronic technologies in the vehicle in order to improve the selling point of the vehicle, so that the automobile is more understandable and more intelligent. The application of the automatic parking function (AUTO HOLD) technology enables a driver to avoid unnecessary sliding of the vehicle under the conditions of not needing long-time braking and starting the electronic parking brake.
The basic principle of the automatic parking maintaining system is that the electronic stability control system unit actively builds pressure to enable a wheel edge to keep certain hydraulic pressure, the magnitude of the hydraulic pressure is related to the slope, and the hydraulic pressure can stop a vehicle to ensure that the vehicle does not slide down the slope. In the conventional automatic parking maintaining system, a driver enters a working state due to misoperation in the driving or reversing process, so that a vehicle is locked.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention provides an automatic parking control system and a control method of an automatic transmission vehicle, aiming at the problems in the related art and aiming at overcoming the technical problems in the prior related art.
Therefore, the invention adopts the following specific technical scheme:
an automatic parking control system and a control method of an automatic transmission vehicle comprise a detection module, a sensor module, an automatic transmission control unit, an engine control unit and a judgment module, wherein the detection module is respectively connected with the sensor module, the automatic transmission control unit, the engine control unit and the judgment module through a CAN bus, and the automatic parking holding system is divided into a closing state, a standby state, a working state, a releasing state and a connecting state;
the detection module is used for detecting whether the automatic parking function starting condition is met, the sensor module comprises a brake pedal sensor, a steering wheel pressure sensor, a seat pressure sensor, an accelerator pedal sensor and an automobile body electronic stabilizing system which are connected in sequence, and the judgment module is used for detecting whether the automatic parking function starting condition is met.
Preferably, the detection module further includes: the system comprises the vehicle speed, the pressure of a brake master cylinder, the state information of a driving side safety belt, the state information of a cab door, the rotating speed of an engine, the opening degree of an accelerator pedal and the gear state information.
Preferably, in the working state, after the vehicle is judged to have a slope slipping trend and the braking pressure on the wheels is actively increased, if the vehicle still has the slope slipping trend, the electronic hand brake system is directly switched to work.
Preferably, the wheel brake pressure is slowly released during the system jumps from the operating state to the standby state under the release state condition satisfying automatic parking.
Preferably, the automatic transmission control unit checks whether a CAN message of the vehicle has a frame loss and a single-frame signal bit error; and if the frame loss and single-frame signal position error exist, judging that the CAN message of the automatic parking function is abnormal in verification, and keeping the current state without activating the automatic parking function.
Preferably, the release state is characterized in that the rotation speed of each wheel is zero, the actual torque output by the engine is sufficient to overcome the current gradient resistance, the transmission is not in neutral, and the clutch is not fully depressed.
According to another aspect of the present invention, there is provided a control method of an automatic parking control system for an automatic transmission vehicle, including the steps of;
if the result that whether the CAN message is checked normally is detected by the detection module, whether the state of the electronic parking system and the state of the automatic parking function meet the condition of activating the automatic parking function is judged, and if so, the automatic parking function is activated;
after a driver steps on an accelerator, judging whether the working state of the automatic parking function is closed, if not, keeping the current state, and if so, judging whether the working state of the electronic parking system is opened;
if not, controlling the pressure of the clutch to be kept above a semi-linkage point, searching an engine torque limit table according to the opening degree of the accelerator to obtain a target torque value, controlling the engine to output the target torque value, and if so, keeping the current state;
if the vehicle speed is not the same, entering a standby state after the vehicle speed is the same;
acquiring a gear signal and a pedal signal in real time when an automobile enters an automatic parking mode;
before the vehicle enters a working state, the system obtains the gradient of the road surface where the vehicle is located according to a sensor on the vehicle;
calculating the four-wheel brake minimum pressure required by the current vehicle parking according to the road surface gradient, and implementing the four-wheel brake minimum pressure on the wheels;
if the accelerator pedal is stepped on and the rotating speed of the engine exceeds a set rotating speed threshold value or a rotating speed threshold value larger than the road surface gradient, the automatic parking system enters a release state;
if the detection module detects any one signal of opening a main driving side vehicle door, loosening a main driving side safety belt or enabling the engine rotating speed to be zero, the automatic parking function is closed;
the method has the advantages that the rotating speed of the engine is not zero, the vehicle door on the main driving side is closed, the safety belt on the main driving side is fastened, and meanwhile, when the starting information of the automatic parking switch is detected, the automatic parking function is automatically started.
Preferably, when the system is in said off state, the system does not respond to changes in vehicle and driver intent without intervention in wheel brake pressure, and when the system is in said standby state, the system monitors vehicle motion and is ready to apply brake pressure at all times, and when the system is in said active state, wheel brake pressure is automatically maintained to maintain the vehicle in park without the driver stepping on the brake pedal.
Preferably, when the system is in the release state, if it is detected that the vehicle satisfies the off-state condition, the automatic parking system enters the off state, when the system is in the take-over state, if it is detected that the vehicle satisfies the standby state, the automatic parking maintaining system enters the standby state, otherwise, the automatic parking maintaining system maintains the take-over state.
Preferably, the automatic parking function activation condition is that an automatic parking switch is activated, a door is closed, and a seat belt is fastened.
The invention has the beneficial effects that:
the control system has the advantages that firstly, the control system has definite logic jump conditions, each condition accords with the operation habits of most drivers, the drivers can clearly understand and adapt to the action of the control system, and the control system has good user interactivity and usability;
secondly, in the starting judgment of the automatic parking function, the conditions of closing the door of the driver and fastening the safety belt of the driver are added, and the driver is prohibited from using the automatic parking system under the condition that the safety of the driver is not guaranteed; monitoring the pressure maintaining time in the automatic parking pressure maintaining process to prevent system components from being burnt;
if the system jumps to an exit state due to the change of external conditions, the system sends a clamping request to the electronic hand brake, so that the electronic hand brake replaces parking braking, the situation that a driver mistakenly takes the automatic parking brake as long-term parking braking is avoided, and the vehicle slipping situation is prevented;
and fourthly, determining the target state of the automatic parking hold according to the running state information of the vehicle and the current state of the automatic parking hold, and controlling the automatic parking hold to be switched from the current state to the target state without manual operation of a user, so that the convenience of the automatic parking hold control can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic mechanical diagram of an automatic park control system for an automatic transmission vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps of an automatic park control system and method for an automatic transmission vehicle according to an embodiment of the present invention;
fig. 3 is a second flowchart illustrating steps of an automatic parking control system and method for an automatic transmission vehicle according to an embodiment of the present invention.
In the figure:
1. a detection module; 2. a sensor module; 3. an automatic transmission control unit; 4. an engine control unit; 5. a judgment module; 6. a CAN bus; 7. a closed state; 8. a standby state; 9. working state; 10. a released state; 11. take over status.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.
According to an embodiment of the invention, an automatic parking control system and a control method for an automatic transmission vehicle are provided.
The first embodiment;
as shown in fig. 1-3, the automatic parking control system and the control method for an automatic transmission vehicle according to the embodiment of the present invention include a detection module 1, a sensor module 2, an automatic transmission control unit 3, an engine control unit 4, and a determination module 5, wherein the detection module 1 is respectively connected to the sensor module 2, the automatic transmission control unit 3, the engine control unit 4, and the determination module 5 through a CAN bus 6, and the automatic parking maintaining system is divided into an off state 7, a standby state 8, an operating state 9, a release state 10, and a take-over state 11;
the detection module 1 is used for detecting whether the automatic parking function starting condition is met, the sensor module 2 comprises a brake pedal sensor 12, a steering wheel pressure sensor 13, a seat pressure sensor 14, an accelerator pedal sensor 15 and an automobile body electronic stabilizing system 16 which are sequentially connected, and the judgment module 5 is used for detecting whether the automatic parking function starting condition is met.
Example two;
as shown in fig. 1 to 3, the detection module 1 further includes: the method comprises the steps of vehicle speed, brake master cylinder pressure, driving side safety belt state information, cockpit door state information, engine rotating speed, accelerator pedal opening degree and gear state information, in the working state 9, when the situation that the vehicle has a slope slipping trend is judged, after the brake pressure on wheels is actively increased, if the vehicle still has the slope slipping trend, the vehicle is directly switched to an electronic hand brake system to work, and under the condition that the releasing state 10 of automatic parking is met, the brake pressure of the wheels is slowly released in the process that the system jumps from the working state 9 to the standby state 8. The design is easy to see, inconvenience caused by the fact that a driver activates the automatic parking maintaining system unintentionally in the driving or reversing process to enable the automatic parking maintaining system to enter a working state is effectively avoided, and satisfaction of users is improved.
Example three;
as shown in fig. 1-3, the automatic transmission control unit 3 checks whether a CAN message of a vehicle has a frame loss and a single-frame signal bit error; if frame loss and single-frame signal bit errors exist, the CAN message of the automatic parking function is judged to be abnormal in verification, the current state is maintained, the automatic parking function is not activated, and the release state 10 is characterized in that the rotating speed of each wheel is zero, the actual torque output by an engine is enough to overcome the current gradient resistance, the transmission is not in neutral, and the clutch is not completely stepped. The design is easy to see, the driving experience is improved, and the problems that the driver loosens the brake pedal because the driver forgets that the automatic parking function is turned off, the rear-end collision is likely to happen or the vehicle easily slips on a slope and the like are avoided.
Example four;
as shown in fig. 1 to 3, according to another aspect of the present invention, there is provided a control method of an automatic parking control system for an automatic transmission vehicle, including the steps of;
step S101, detecting whether the CAN message is checked to be normal through the detection module 1, if so, judging whether the state of the electronic parking system and the state of the automatic parking function meet the condition of activating the automatic parking function, and if so, activating the automatic parking function;
step S103, after the driver steps on the accelerator, judging whether the working state of the automatic parking function is closed, if not, keeping the current state, and if so, judging whether the working state of the electronic parking system is opened;
step S105, if not, controlling the pressure of the clutch to be kept above a semi-linkage point, searching an engine torque limit table according to the opening degree of the accelerator to obtain a target torque value, controlling the engine to output the target torque value, and if so, keeping the current state;
step S107, when the vehicle speed is 0, if the vehicle speed is 0, entering a working state 9, and if the vehicle speed is not 0, entering a standby state 8 after the vehicle speed is 0;
step S109, acquiring a gear signal and a pedal signal in real time when the automobile enters an automatic parking mode;
step S111, before entering the working state 9, the system obtains the gradient of the road surface where the current vehicle is located according to the sensor on the vehicle;
step S113, calculating the four-wheel brake minimum pressure required by the current vehicle parking according to the road surface gradient, and implementing the four-wheel brake minimum pressure on the wheels;
step S115, if an accelerator pedal is stepped on and the engine speed exceeds a set speed threshold or a speed threshold larger than the road surface gradient, the automatic parking system enters a release state 10;
step S117, if the detection module 1 detects any one signal of opening of a main driving side vehicle door, loosening of a main driving side safety belt or zero engine rotating speed, closing the automatic parking function;
and step S119, newly meeting the conditions that the rotating speed of the engine is not zero, the vehicle door on the main driving side is closed, the safety belt on the main driving side is fastened, and meanwhile, when the starting information of the automatic parking switch is detected, the automatic parking function is automatically started.
Example five;
as shown in fig. 1-3, when the system is in the off state 7, the system does not respond to the change of the intention of the vehicle and the driver, and does not intervene in the wheel brake pressure, when the system is in the standby state 8, the system monitors the moving state of the vehicle, and prepares to apply the brake pressure at any time, when the system is in the working state 9, the system automatically maintains the wheel brake pressure, so that the vehicle can maintain the parking without the driver stepping on the brake pedal, when the system is in the release state 10, the automatic parking system enters the off state if the condition of the off state 7 is detected, when the system is in the take-over state 11, the automatic parking maintaining system enters the standby state 8 if the condition of the standby state 8 is detected, otherwise, the automatic parking maintaining system maintains the take-over state 11, and the automatic parking function on condition refers to that the automatic parking switch is turned on, The door is closed and the seat belt is fastened.
In summary, by means of the technical scheme of the invention, through having the definite logical jump conditions, each condition accords with the operation habits of most drivers, and the drivers can clearly understand and adapt to the action of the control system, so that the control system has good user interactivity and usability; in the automatic parking function starting judgment, conditions of closing the door of a driver and fastening a safety belt of the driver are added, and the driver is prohibited from using an automatic parking system under the condition that the safety of the driver is not guaranteed; monitoring the pressure maintaining time in the automatic parking pressure maintaining process to prevent system components from being burnt; if the system jumps to an exit state due to external condition change, the system sends a clamping request to the electronic hand brake, so that the electronic hand brake replaces parking brake, the driver is prevented from mistakenly taking automatic parking as long-term parking brake, and the vehicle slipping condition is prevented; the target state of automatic parking holding is determined according to the running state information of the vehicle and the current state of automatic parking holding, the automatic parking holding is controlled to be switched from the current state to the target state, manual operation of a user is not needed, and convenience of automatic parking holding control can be improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. The automatic parking control system of the automatic transmission vehicle is characterized by comprising a detection module (1), a sensor module (2), an automatic transmission control unit (3), an engine control unit (4) and a judgment module (5), wherein the detection module (1) is respectively connected with the sensor module (2), the automatic transmission control unit (3), the engine control unit (4) and the judgment module (5) through a CAN bus (6), and the automatic parking holding system is divided into a closing state (7), a standby state (8), a working state (9), a releasing state (10) and a connecting pipe state (11);
the automatic parking function starting device comprises a detection module (1), a sensor module (2), a judgment module (5) and a vehicle body electronic stabilizing system (16), wherein the detection module (1) is used for detecting whether the automatic parking function starting condition is met, the sensor module comprises a brake pedal sensor (12), a steering wheel pressure sensor (13), a seat pressure sensor (14), an accelerator pedal sensor (15) and the vehicle body electronic stabilizing system (16), which are sequentially connected, and the judgment module (5) is used for detecting whether the automatic parking function starting condition is met.
2. The automatic parking control system of an automatic transmission vehicle according to claim 1, characterized in that said detection module (1) further comprises: the system comprises the vehicle speed, the pressure of a brake master cylinder, the state information of a driving side safety belt, the state information of a cab door, the rotating speed of an engine, the opening degree of an accelerator pedal and the gear state information.
3. The automatic parking control system of an automatic transmission vehicle as claimed in claim 1, characterized in that in the working state (9), after the vehicle is judged to have a tendency to slide down the slope and the braking pressure on the wheels is actively increased, if the vehicle still has the tendency to slide down the slope, the electronic hand brake system is directly switched to work.
4. Automatic parking control system for vehicles with automatic transmission according to claim 1, characterized in that the wheel brake pressure is slowly released during the transition from the active state (9) to the standby state (8) in the condition that the release state (10) of automatic parking is fulfilled.
5. The automatic parking control system of an automatic transmission vehicle according to claim 1, wherein the automatic transmission control unit (3) checks whether a CAN message of the vehicle has a frame loss and a single-frame signal bit error; and if the frame loss and single-frame signal position error exist, judging that the CAN message of the automatic parking function is abnormal in verification, and keeping the current state without activating the automatic parking function.
6. The automatic parking control system and control method of an automatic transmission vehicle according to claim 1, characterized in that the release state (10) means that the rotation speed of each wheel is zero, the actual torque output of the engine is sufficient to overcome the current gradient resistance, the transmission is not in neutral, and the clutch is not fully depressed.
7. A control method of an automatic parking control system of an automatic transmission vehicle, characterized by comprising the steps of;
if the result that whether the CAN message is checked normally is detected by the detection module (1), whether the state of the electronic parking system and the state of the automatic parking function meet the condition for activating the automatic parking function is judged, and if so, the automatic parking function is activated;
after a driver steps on an accelerator, judging whether the working state of the automatic parking function is closed, if not, keeping the current state, and if so, judging whether the working state of the electronic parking system is opened;
if not, controlling the pressure of the clutch to be kept above a semi-linkage point, searching an engine torque limit table according to the opening degree of the accelerator to obtain a target torque value, controlling the engine to output the target torque value, and if so, keeping the current state;
when the vehicle speed is 0, if the vehicle speed is 0, entering a working state (9), and if the vehicle speed is not 0, entering a standby state (8) after the vehicle speed is 0;
acquiring a gear signal and a pedal signal in real time when an automobile enters an automatic parking mode;
before the vehicle enters a working state (9), the system obtains the gradient of the road surface where the vehicle is located according to a sensor on the vehicle;
calculating the four-wheel brake minimum pressure required by the current vehicle parking according to the road surface gradient, and implementing the four-wheel brake minimum pressure on the wheels;
if the accelerator pedal is stepped on and the rotating speed of the engine exceeds a set rotating speed threshold value or a rotating speed threshold value larger than the road surface gradient, the automatic parking system enters a release state (10);
if the detection module (1) detects any one signal of opening a main driving side vehicle door, loosening a main driving side safety belt or enabling the engine rotating speed to be zero, the automatic parking function is closed;
the method has the advantages that the rotating speed of the engine is not zero, the vehicle door on the main driving side is closed, the safety belt on the main driving side is fastened, and meanwhile, when the starting information of the automatic parking switch is detected, the automatic parking function is automatically started.
8. The control method of an automatic parking control system of an automatic transmission vehicle according to claim 7, characterized in that when the system is in said off state (7), the system does not respond to changes in the vehicle and the driver's intention, without intervention in the wheel brake pressure, while when the system is in said standby state (8), the system monitors the vehicle's movement state, ready to apply the brake pressure at any time, and when the system is in said active state (9), automatically maintains the wheel brake pressure, keeping the vehicle parked without the driver's pedal.
9. The automatic parking control system and the control method for the automatic transmission vehicle according to claim 8, characterized in that when the system is in the release state (10), if it is detected that the vehicle satisfies the condition of the off state (7), the automatic parking system enters the off state, when the system is in the take-over state (11), if it is detected that the vehicle satisfies the standby state (8), the automatic parking hold system enters the standby state (8), otherwise, the automatic parking hold system holds the take-over state (11).
10. The system and method of claim 9, wherein the automatic parking function enabling conditions include an automatic parking switch being turned on, a door being closed, and a seat belt being fastened.
CN202010640315.8A 2020-07-06 2020-07-06 Automatic parking control system and control method for automatic transmission vehicle Pending CN111923909A (en)

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CN202010640315.8A CN111923909A (en) 2020-07-06 2020-07-06 Automatic parking control system and control method for automatic transmission vehicle

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CN112477872A (en) * 2020-11-26 2021-03-12 中国第一汽车股份有限公司 Parameter calibration method, device, equipment and storage medium
CN112590790A (en) * 2020-12-15 2021-04-02 东风汽车集团有限公司 EPB drive-off release anti-collision method and system
CN112622884A (en) * 2020-12-28 2021-04-09 奇瑞汽车股份有限公司 Automatic parking and automatic engine starting and stopping integrated control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112477872A (en) * 2020-11-26 2021-03-12 中国第一汽车股份有限公司 Parameter calibration method, device, equipment and storage medium
CN112590790A (en) * 2020-12-15 2021-04-02 东风汽车集团有限公司 EPB drive-off release anti-collision method and system
CN112622884A (en) * 2020-12-28 2021-04-09 奇瑞汽车股份有限公司 Automatic parking and automatic engine starting and stopping integrated control method

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