A method for controlling the activation of an automatic parking function

Abstract

The present invention discloses a method for controlling the opening and closing of an automatic parking function, comprising: presetting a plurality of system working states in an automatic parking system, and controlling the conversion of the system working state according to the state information of the vehicle, wherein the system working state comprises: an automatic parking system closing state, an automatic parking system function activation state, and the automatic parking system does not work in the automatic parking system closing state; in the automatic parking system function activation state, the vehicle automatic parking function is started and the vehicle is controlled according to the automatic parking function. The advantages of the present invention are: the intention of the driver can be reflected according to the change of the brake pedal pressure and the automatic parking function can be automatically turned on when the conditions are met, which is simple and convenient, and realizes intelligent and automatic opening control.

Description

Technical Field

[0001] The invention relates to the technical field of chassis brakes, and in particular to an intelligent automatic parking opening control method. Background Art

[0002] With the continuous development of automobile technology, AUTOHOLD automatic parking system has become a standard feature in automobiles, and automobiles are developing rapidly towards electrification and intelligence. At present, the automatic parking system in automobiles can be turned on and off through the function switch under certain conditions, such as "the main driver's door is closed" and "the main driver's safety is fastened". After the function is turned on, it can trigger automatic parking and holding every time the vehicle stops after braking. This makes it very unfriendly when used in conditions such as repeated parking and starting in congested roads and parking in small parking spaces. If the automatic parking function is turned off, the system will not work until the driver actively turns on the activation function switch, and the system cannot intelligently control whether each brake activates the function based on the driver's subjective wishes. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for controlling the opening and closing of an automatic parking function, so as to realize an automated and intelligent automatic parking function opening strategy.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a method for controlling the opening and closing of an automatic parking function, comprising:

[0005] A plurality of system working states are pre-set in the automatic parking system, and the switching of the system working states is controlled according to the vehicle status information, wherein the system working states include: the automatic parking system off state and the automatic parking system function activated state. When the automatic parking system is off state, the automatic parking system does not work; when the automatic parking system function is activated state, the vehicle automatic parking function is started and the vehicle is controlled according to the automatic parking function.

[0006] After the vehicle is started, the automatic parking system enters the automatic parking system off state by default, and enters the automatic parking function activated state after the vehicle driving status data meets the conversion conditions.

[0007] The system working status also includes the automatic parking system preparation state. When the vehicle is in the system off state, whether to enter the automatic parking system preparation state is controlled according to whether the preparation state conditions are met. When in the automatic parking system preparation state, the automatic parking system function activation state is entered when the activation conditions are met.

[0008] The preparation status conditions include the vehicle being stationary, the engine being running, the doors being closed, the driver's seat belt being worn, the EPB electronic parking brake being released, the vehicle being braked, and the brake pressure being greater than the set activation threshold. When all of the above conditions are met, the automatic parking system enters the automatic parking system preparation status.

[0009] The activation conditions are: when the vehicle is in the automatic parking preparation state, the pressure signal of the brake pedal is monitored. When the pressure change meets the secondary braking, the automatic parking system enters the function activation state from the preparation state.

[0010] The method for determining whether the pressure change satisfies the secondary braking includes: converting the pressure signal into a pressure change rate through the monitored pedal pressure signal, and comparing the ratio or difference between the pressure change rate at the next moment monitored during the sampling period and the pressure change rate at the previous moment. When a pre-set pressure change rate ratio threshold or pressure change rate difference threshold is met, it is determined that the secondary braking is met.

[0011] When the vehicle is in the preparation state, if any of the preparation state conditions is not met, the automatic parking system will enter the off state.

[0012] The vehicle driving state data satisfies the conversion condition that the vehicle driving data satisfies the preparation state condition and the activation condition; when the automatic parking system is in the preparation state, the activation state of the automatic parking system can be entered according to the judgment of the activation condition.

[0013] The advantages of the present invention are: it can reflect the driver's intention according to the change of brake pedal pressure and automatically start the automatic parking function when the conditions are met, which is simple and convenient, and realizes intelligent and automatic start control; at the same time, due to the use of an automatic start control method, it can save hardware switches, save costs, and reduce the cost of the whole vehicle; the three functional states of the automatic parking system are set and automatically enter different states according to the driving conditions of the whole vehicle, thereby meeting the different needs of the driver; the set preparation conditions, activation conditions, etc. are more reasonable and reliable, and can more safely reflect the driver's intention while helping the driver to automatically start the automatic parking function. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0015] Figure 1 A schematic diagram of a flow chart for activating the automatic parking function of the present invention;

[0016] Figure 2 This is the decision logic diagram for activating the automatic parking function of the present invention. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0018] The present invention provides an intelligent automatic parking function activation strategy, during which the driver can intelligently control the activation of the function under each braking condition according to his subjective will; at the same time, the vehicle function control switch is cancelled, the vehicle cost is reduced, and the automation and intelligence of the vehicle can be improved, the user experience can be improved, and the technology configuration can be optimized. The specific scheme is as follows:

[0019] A method for controlling the opening and closing of an automatic parking function, comprising:

[0020] A plurality of system working states are pre-set in the automatic parking system, and the conversion of the system working states is controlled according to the status information of the vehicle, wherein the system working states include: the automatic parking system off state, the automatic parking system preparing state, and the automatic parking system function activated state. When the automatic parking system is in the off state, the automatic parking system does not work and is in the off state; when the automatic parking system function is in the activated state, the vehicle automatic parking function is started and the vehicle is controlled according to the automatic parking function; when the automatic parking system is in the preparing state, the automatic parking system is in the ready state and can work once the activation conditions are obtained.

[0021] After the vehicle is started, the automatic parking system enters the automatic parking system off state by default, and enters the automatic parking function active state after the vehicle driving status data meets the conversion conditions. The vehicle driving status data meets the conversion conditions when the vehicle driving data meets the preparation state conditions and activation conditions; when the automatic parking system is in the preparation state, it can enter the automatic parking system active state according to the judgment of the activation conditions.

[0022] When the vehicle driving data meets the conversion conditions, it will first enter the preparation state and then enter the activation state. The vehicle automatic parking system cannot enter the activation state directly from the off state. It can only enter the preparation state after detecting that the preparation state conditions are met in the off state. It will enter the activation state after the activation conditions are met in the preparation state. If the preparation conditions are not met in the preparation state, it will enter the off state.

[0023] When the vehicle is in a state where there is no functional failure in the system and the working conditions cannot be met, such as the vehicle is in driving, the driver's door is not closed, the driver's seat belt is not fastened, the brakes are not applied, or the brake pressure is too low to reach the function activation threshold, or the EPB electronic parking brake is in a locked state, etc., if any of these conditions is met, the system will enter the closed state from the preparation state.

[0024] When the vehicle is in the system off state, whether to enter the automatic parking system preparation state is controlled according to whether the preparation state conditions are met. When in the automatic parking system preparation state, the automatic parking system function activation state is entered when the activation conditions are met.

[0025] The preparation state conditions include the vehicle being stationary, the engine being running, the doors being closed, the driver's seat belt being worn, the EPB electronic parking brake being released, the vehicle being braked, and the brake pressure being greater than the set activation threshold. When all of the above conditions are met, the automatic parking system enters the automatic parking system preparation state. When in the preparation state, the preparation state conditions and activation conditions are constantly monitored. If the activation conditions are met, the vehicle enters the activation state. If any of the preparation state conditions are not met, the system enters the system shutdown state.

[0026] In this application, the activation condition is: when the vehicle is in the automatic parking preparation state, the pressure signal of the brake pedal is monitored, and when the pressure change meets the secondary braking, the automatic parking system enters the function activation state from the preparation state. Secondary braking refers to the change in the pressure change rate when the driver presses the brake pedal again after pressing it.

[0027] The method for judging whether the pressure change satisfies the secondary braking includes: converting the pressure signal into the pressure change rate through the monitored pedal pressure signal, comparing the ratio or difference of the pressure change rate monitored at the next moment and the pressure change rate at the previous moment during the sampling period, and judging that the secondary braking is satisfied when the preset pressure change rate ratio threshold or pressure change rate difference threshold is met. The pressure change rate difference threshold or ratio threshold can be preset, and when it is greater than the threshold, it is considered that the driver intends to start the automatic parking system, which can well express the driver's intention, and the driver can control the brake pedal according to the actual situation.

[0028] When in the activated state, set the conditions for the activation state to enter the closed state. When the conditions are met, the system enters the closed state. The conditions for the activation state to enter the closed state can be set according to the needs, including but not limited to: the vehicle enters the automatic parking system closed state after any condition is met, such as the vehicle is turned off, the vehicle door is opened, the main driver's seat belt is not worn, and the EPB electronic parking system is in a locked state. After entering the closed state, the vehicle's monitoring data is used to determine whether to enter the preparation state or monitor the driver's pedal pressure signal in the preparation state to determine whether to activate the automatic parking function.

[0029] The present invention divides the automatic parking function status into three states: system off, system ready, and system function activated, and determines the working state of the system through a logic gate.

[0030] The automatic parking system is in the off state, the system has no functional faults and the working conditions cannot be met, such as the vehicle is in motion or the driver's door is not closed or the driver's seat belt is not fastened or the brakes are not applied or the brake pressure is too low to reach the function activation threshold or the EPB electronic parking system is in a locked state.

[0031] The preparation of the automatic parking system requires the vehicle to be stationary, the engine to be running, the driver's door to be closed, the driver's seat belt to be fastened, the EPB electronic parking brake to be released, and the brake pressure to be greater than the activation threshold.

[0032] The prerequisite for the automatic parking system to be activated is that the system is in preparation. If the driver needs the automatic parking function to work and maintain pressure, it can be activated by simply performing a second braking.

[0033] After the vehicle is started, the system defaults to the off state. When certain function activation conditions are met, the system automatically switches to the preparation state and function activation state.

[0034] like Figure 1 , 2 As shown, when the vehicle brakes from motion to a stationary state, the system calculates the vehicle speed through the four-wheel speeds collected by the ESC to determine whether the vehicle speed is stationary (in the example, the system determines that the vehicle is stationary when the speed is less than 0.2kph), and determines whether the main driver's door is closed and whether the driver has fastened his seat belt through the door and seat belt signals on the public CAN. The driver's brake pressure is collected through the master cylinder pressure sensor inside the ESC. When the brake pressure is greater than the threshold value (in the example, when the vehicle is on a road with a road slope of less than 3%, the brake pressure threshold value is 12bar), when all the above conditions are met, the system function is turned on and enters the standby state.

[0035] When the automatic parking system is in the standby state, if the driver continues to maintain the brake, the system will remain in the standby state. If the driver releases the brake pedal, the automatic parking system function is turned off. If the driving demand activates the brake hold function, a second braking is required. The specific judgment strategy is that when the system meets the ready state, the system will continue to monitor and compare (such as Figure 2 The system converts the braking pressure into the pressure change rate through pressure monitoring calculation. When the ratio of the pressure increase rate at the next moment to the pressure increase rate at the previous moment is greater than the threshold value after three sampling cycles ( Figure 2 At time t1 in the example, the pressure sampling period is 10ms, the threshold value is 1.1, and the threshold value needs to be matched with the actual vehicle according to the vehicle mass, basic braking system parameters and the sensitivity of the system triggering), the system reaches the activation condition of the automatic parking function. After this condition is met, the driver releases the brake pedal and the pressure drops to the pressure holding threshold. The system works to trigger the automatic parking hold ( Figure 2 at time t2).

[0036] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for controlling the activation of an automatic parking function, characterized in that: include: A plurality of system working states are pre-set in the automatic parking system, and the conversion of the system working states is controlled according to the status information of the vehicle, wherein the system working states include: the automatic parking system off state and the automatic parking system function activated state. When the automatic parking system is off state, the automatic parking system does not work; when the automatic parking system function is activated, the vehicle automatic parking function is started and the vehicle is controlled according to the automatic parking function; after the vehicle is started, the automatic parking system enters the automatic parking system off state by default, and enters the automatic parking function activated state after the vehicle driving status data meets the conversion conditions; the system working state also includes the automatic parking system preparation state. When the vehicle is in the system off state, whether to enter the automatic parking system preparation state is controlled according to whether the preparation state conditions are met. When the vehicle is in the automatic parking system preparation state, the automatic parking system function activated state is entered when the activation conditions are met; the preparation state conditions include the vehicle being stationary and the engine being running state, the door is closed, the driver's seat belt is worn, the EPB electronic parking is released, the vehicle is in a braking state, and the brake pressure is greater than the set activation threshold. When the above conditions are all met, the automatic parking system enters the automatic parking system preparation state; the activation condition is: when the vehicle is in the automatic parking preparation state, the pressure signal of the brake pedal is monitored, and when the pressure change meets the secondary braking, the automatic parking system enters the function activation state from the preparation state; the method for judging whether the pressure change meets the secondary braking includes: through the monitored pedal pressure signal, the pressure signal is converted into a pressure change rate, and the ratio or difference of the pressure change rate monitored at the next moment and the pressure change rate at the previous moment during the sampling period is compared. When the preset pressure change rate ratio threshold or pressure change rate difference threshold is met, it is judged that the secondary braking is met; when the vehicle is in the preparation state, if any of the preparation state conditions is not met, the automatic parking system enters the closed state; The vehicle driving state data satisfies the conversion condition that the vehicle driving data satisfies the preparation state condition and the activation condition; when the automatic parking system is in the preparation state, the activation state of the automatic parking system can be entered according to the judgment of the activation condition; When the automatic parking system is in the ready standby state, if the driver continues to maintain braking, the system will remain in the ready state. If the driver releases the brake pedal, the automatic parking system function will be turned off. If the driving demand activates the brake hold function, secondary braking is required. The specific judgment strategy is that when the system meets the ready state, the system will continue to monitor and compare the brake pressure. The system converts the pressure change rate through pressure monitoring calculation. When the ratio of the pressure increase rate at the next moment to the pressure increase rate at the previous moment is greater than the threshold value after 3 consecutive sampling cycles, the system reaches the activation condition of the automatic parking function. After this condition is met, the driver releases the brake pedal and when the pressure drops to the pressure holding threshold, the system will trigger the automatic parking hold.

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