Solenoid valve control method and system, electronic equipment and vehicle

Abstract

The invention provides an electromagnetic valve control method and system, electronic equipment and a vehicle, and relates to the technical field of vehicle safety control, and the electromagnetic valve control method comprises the steps that action information of each preset module of the vehicle at the current moment is acquired, and the emergency degree of the vehicle in a future preset time period is determined according to the action information; determining a target holding current of the electromagnetic valve according to the emergency degree and the current holding current of the electromagnetic valve; and controlling the electromagnetic valve according to the target holding current. The electromagnetic valve solves the problems that in the prior art, when the holding current of the electromagnetic valve is small, the current is difficult to pull up in a short time, or when the holding current is large, large heat collection burden is easily caused to a valve coil.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety control, and in particular to a solenoid valve control method, system, electronic equipment and vehicle. Background Art

[0002] The SSV solenoid valve is a switch valve in the One-Box brake, located between the brake master cylinder and the simulator. It is a normally closed valve and requires power to open.

[0003] At present, the mainstream SSV solenoid valve control strategies mainly include the normally closed strategy and the normally open strategy. Among them, for the normally open control strategy of the SSV solenoid valve, the SSV solenoid valve needs a long time to maintain the current.

[0004] If the maintenance current is too small, when the pedal is pressed quickly, the brake fluid will flow through the SSV solenoid valve at a very fast speed, and at the same time, a tendency will be generated to close the SSV solenoid valve. Experiments have shown that when the driver's braking request is very urgent, such as the push rod stroke advancing speed is very large, such as 300mm / s, a flow sufficient to close the SSV solenoid valve will be generated within 10ms. However, the current control scheduling cycle of the SSV valve of the current mainstream products is 5ms. Considering the push rod stroke signal acquisition delay and the SSV solenoid valve current response delay, it is difficult to effectively pull up the current of the SSV solenoid valve within 10ms to counteract this abnormal closure phenomenon.

[0005] If the holding current is too large, although it can resist the closing trend of the SSV valve for a long time (such as 20ms) and wait for the SSV solenoid valve current compensation strategy to increase the current, the excessive holding current will cause a greater heat collection burden on the SSV valve coil, which will inevitably shorten the life cycle of the SSV solenoid valve and further affect the service life of related products. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a solenoid valve control method, system, electronic device and vehicle, which solves the problem in the prior art that when the solenoid valve maintains a small current, it is difficult to increase the current in a short time, or when the maintaining current is large, it is easy to cause a large heat collection burden on the valve coil.

[0007] At least one embodiment of the present invention provides a solenoid valve control method, comprising:

[0008] Obtaining the action information of each preset module of the vehicle at the current moment, and determining the urgency of the vehicle in a future preset time period based on the action information;

[0009] Determining a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve;

[0010] The solenoid valve is controlled according to the target maintaining current.

[0011] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0012] The present invention determines the urgency of the vehicle within a preset time period in the future according to the action information, and then determines the target maintaining current of the solenoid valve in advance to control the solenoid valve. Through this setting, the solenoid valve maintains a small maintaining current without change under normal conditions. Before emergency braking may occur, the urgency of the above-mentioned emergency braking can be predicted according to the action information, so as to change the maintaining current of the solenoid valve in advance within a preset time period in the future, so as to better cope with the possible emergency braking and more effectively increase the maintaining current of the SSV solenoid valve in a short time.

[0013] In a solenoid valve control method provided in one embodiment of the present invention, the step of obtaining the action information of each preset module of the vehicle at the current moment and determining the urgency of the vehicle in a future preset time period according to the action information includes:

[0014] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0015] The emergency level is determined according to the opening size in the current throttle opening information.

[0016] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0017] By acquiring the vehicle's throttle opening information, when the driver's throttle opening is large, it can be considered that emergency braking will not occur within a preset time period in the future, and the degree of urgency can be reduced accordingly, so that the maintaining current of the solenoid valve remains at a low state, avoiding the heat collection burden on the SSV valve coil. When the driver's throttle is low, it can be considered that emergency braking may occur within a preset time period in the future, and the degree of urgency can be increased accordingly, so that the maintaining current of the solenoid valve remains at a high state, so as to be prepared for possible emergency braking at any time.

[0018] In a solenoid valve control method provided in one embodiment of the present invention, determining the emergency level according to the current throttle opening includes:

[0019] The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

[0020] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0021] By combining the rate of change of the throttle opening, the urgency can be adaptively reduced when the opening change rate is slow. When the opening change rate is fast, it indicates that the driver has a need to decelerate quickly. The urgency can be adaptively increased to keep the maintaining current of the solenoid valve at a higher state in advance to be prepared for possible emergency braking at any time. Obviously, by combining the opening change rate, the prediction of possible emergency braking in the future is made more accurate.

[0022] In one embodiment of the present invention, a solenoid valve control method is provided, which further includes:

[0023] When the assisted driving system is turned on, a preset input signal of the assisted driving system is obtained, and the degree of urgency is determined according to the preset input signal.

[0024] The technical solution disclosed in the present invention has at least the following beneficial effects:

[0025] Considering that the actual throttle opening will not change when the assisted driving is turned on, at this time, the present invention detects the preset input signal of the assisted driving system to obtain the corresponding urgency, and then changes the maintenance current of the solenoid valve in advance.

[0026] In a solenoid valve control method provided in one of the embodiments of the present invention, the preset input signal includes: at least one of virtual throttle opening information, vehicle target deceleration information, automatic warning braking module trigger signal, automatic braking pre-filling module trigger signal and automatic emergency braking module trigger signal.

[0027] At least one embodiment of the present invention provides a solenoid valve control system, comprising:

[0028] The prediction module obtains the action information of each preset module of the vehicle at the current moment, and determines the urgency of the vehicle in a future preset time period based on the action information;

[0029] A pre-action module, which determines a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve;

[0030] A control module controls the solenoid valve according to the target maintaining current.

[0031] In a solenoid valve control system provided in one embodiment of the present invention, the prediction module includes:

[0032] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0033] The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

[0034] In a solenoid valve control system provided in one embodiment of the present invention, the prediction module further includes:

[0035] When the assisted driving system is turned on, a preset input signal of the assisted driving system is obtained, and the degree of urgency is determined according to the preset input signal.

[0036] The present invention also provides an electronic device, comprising a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor implements the solenoid valve control method as described above when executing the program.

[0037] The present invention also provides a vehicle, characterized in that the vehicle is equipped with an electronic device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic flow chart of a solenoid valve control method provided by the present invention;

[0039] Figure 2 It is a waveform diagram of throttle opening change, emergency index change, SSV valve initial maintenance current change, SSV valve compensation target maintenance current change and brake pedal travel change;

[0040] Figure 3 A logic control diagram of a solenoid valve control method provided by the present invention;

[0041] Figure 4 A schematic structural diagram of a solenoid valve control system provided by the present invention. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0043] Currently, the SSV solenoid valve maintains a small current. When the driver encounters an emergency condition and quickly steps on the pedal, it will cause the SSV solenoid valve to close abnormally for a short time, the brake pedal feedback force to be non-linear, the target pressure to fluctuate abnormally, and other user complaints.

[0044] When the present invention recognizes that the driver may encounter an emergency condition, it calculates the emergency index (i.e., the degree of urgency). Different emergency indexes give the SSV solenoid valve different target current compensations and target current growth slopes, so that when the driver urgently steps on the brake pedal, the SSV solenoid valve closes without abnormality, and the brake pedal is stepped on smoothly without abnormal blockage.

[0045] Based on this, the present invention provides a solenoid valve control method, please refer to Figure 1 As shown, including:

[0046] Obtaining the action information of each preset module of the vehicle at the current moment, and determining the urgency of braking if the vehicle brakes within a preset time period in the future based on the action information;

[0047] Determining a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve;

[0048] The solenoid valve is controlled according to the target maintaining current.

[0049] The present invention determines the urgency of the vehicle within a preset time period in the future according to the action information, and then determines the target maintaining current of the solenoid valve in advance to control the solenoid valve. Through this setting, the solenoid valve maintains a small maintaining current without change under normal conditions. Before emergency braking may occur, the urgency of the above-mentioned emergency braking can be predicted according to the action information, so as to change the maintaining current of the solenoid valve in advance within a preset time period in the future, so as to better cope with the possible emergency braking and more effectively increase the maintaining current of the SSV solenoid valve in a short time.

[0050] In one embodiment of the present invention, the step of obtaining the action information of each preset module of the vehicle at the current moment and determining the urgency of the vehicle in a future preset time period according to the action information includes:

[0051] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0052] The degree of urgency is determined according to the opening size in the current throttle opening information.

[0053] By acquiring the vehicle's throttle opening information, when the driver's throttle opening is large, it can be considered that emergency braking will not occur within a preset time period in the future, and the degree of urgency can be reduced accordingly, so that the maintaining current of the solenoid valve remains at a low state, avoiding the heat collection burden on the SSV valve coil. When the driver's throttle is low, it can be considered that emergency braking may occur within a preset time period in the future, and the degree of urgency can be increased accordingly, so that the maintaining current of the solenoid valve remains at a high state, so as to be prepared for possible emergency braking at any time.

[0054] In another embodiment provided by the present invention, the step of obtaining the action information of each preset module of the vehicle at the current moment, and determining the urgency of the vehicle in a future preset time period according to the action information, includes:

[0055] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0056] The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

[0057] In this embodiment, the emergency degree is represented by an emergency index, which can be obtained according to the size of the throttle opening and the rate of change of the throttle opening. For example, the smaller the throttle opening, the larger the emergency index, the faster the throttle opening changes, and the larger the emergency index. On the contrary, the larger the throttle opening, the smaller the emergency index, the slower the throttle opening changes, and the smaller the emergency index.

[0058] By combining the rate of change of the throttle opening, the urgency can be adaptively reduced when the opening change rate is slow. When the opening change rate is fast, it indicates that the driver has a need to decelerate quickly. The urgency can be adaptively increased to keep the maintaining current of the solenoid valve at a higher state in advance to be prepared for possible emergency braking at any time. Obviously, by combining the opening change rate, the prediction of possible emergency braking in the future is made more accurate.

[0059] Furthermore, in order to improve the accuracy of the present invention in controlling the SSV solenoid valve using the target maintaining current in advance, the present invention maintains the emergency index at a lower state when the throttle opening rate change is lower than a preset value. At this time, the target maintaining current of the SSV solenoid valve is consistent with the initial maintaining current of the SSV solenoid valve under normal operation, that is, the maintaining current of the SSV solenoid valve is not pre-increased.

[0060] Specifically, the method further includes:

[0061] When the auxiliary driving system is turned on, a preset input signal of the auxiliary driving system is obtained, and the urgency level is determined according to the preset input signal, wherein:

[0062] The preset input signal includes: at least one of virtual throttle opening information, vehicle target deceleration information, automatic warning braking module trigger signal, automatic braking pre-filling module trigger signal and automatic emergency braking module trigger signal.

[0063] When obtaining virtual throttle opening information, its impact on the degree of urgency is consistent with the throttle opening information when assisted driving is turned on; when obtaining vehicle target deceleration information, its impact on the degree of urgency follows the size of the vehicle's target deceleration. When the vehicle's target deceleration is large, the degree of urgency increases, and when the vehicle's target deceleration is small, the degree of urgency changes; when obtaining the automatic warning braking module trigger signal, the automatic braking pre-filling module trigger signal or the automatic emergency braking module trigger signal, the degree of urgency can be directly adjusted to a larger value to increase the current SSV solenoid valve holding current.

[0064] Considering that the actual throttle opening will not change when the assisted driving is turned on, at this time, the present invention detects the preset input signal of the assisted driving system to obtain the corresponding urgency, and then changes the maintenance current of the solenoid valve in advance.

[0065] In summary, please refer to Figure 3 As shown:

[0066] a. When the assisted driving function is turned off, the driver's throttle opening information is monitored and an emergency index (i.e., degree of urgency) between 0 and 1 is calculated. For example, when the driver is accelerating or holding the throttle steady, it indicates that the driver may not need to brake and the emergency index is low. When the driver releases the accelerator pedal at a very fast speed, it indicates that the driver may have encountered an emergency condition and may need to brake in a short time, so the emergency index can be considered to be 1.

[0067] b. When the assisted driving function is turned on, the virtual throttle opening, ADAS function activation flag, ADAS target deceleration, automatic warning brake module trigger signal, automatic brake pre-fill module trigger signal and automatic emergency brake module are monitored to calculate an emergency index between 0 and 1; when the virtual throttle opening is detected to increase or stabilize at a larger level, it can be considered that the driver has no braking demand and the emergency index is low; when the ADAS target deceleration is detected to increase rapidly, or the throttle opening is detected to decrease rapidly, or when the ADAS function activation flag is detected to be triggered, where the triggering of the ADAS function activation flag includes AWB / ABP / AEB (automatic warning brake / automatic brake pre-fill / automatic emergency brake) and other function triggers, it can be considered that the driver may have an emergency braking demand in the next short period of time, and the emergency index should be larger at this time.

[0068] After getting the urgency index:

[0069] According to the current holding current of the SSV solenoid valve and the emergency index, a new SSV valve target holding current is calculated. When the current holding current is small, the emergency index will continue to increase, and will increase to a larger target holding current at a larger target current growth rate, and at the same time, the duration and size of this target holding current will be limited.

[0070] Here Figure 2 The waveform shown is schematically illustrated:

[0071] It should be noted that even without the control strategy of the present invention, the SSV valve will increase the corresponding holding current after the brake pedal stroke to counteract the closing trend of the SSV valve. The control process is shown in FIG. Figure 2The waveform of the initial holding current of the SSV valve in the embodiment of the present invention does not change the above control method, but adds a pre-control stage based on the traditional control method. The pre-control stage is as follows:

[0072] In the T1 stage, the throttle opening rate of change is slower than the preset value, and the emergency index is kept at a lower value. At this time, the SSV valve holding current does not change;

[0073] At the beginning of the T2 stage, the throttle opening decreases rapidly, and the throttle opening change rate increases rapidly. At this time, the emergency index increases with the throttle opening change rate. At this time, since the brake pedal is not actuated, the initial holding current of the traditional SSV valve does not change. At this time, the present invention increases the target holding current of the SSV valve according to the increase of the emergency index. If the subsequent brake pedal is not actuated quickly, the target holding current of the SSV valve is restored to the previous state after being maintained for a certain period of time. If the reference Figure 2 In the brake pedal stroke, after the throttle opening changes rapidly, the brake pedal also changes rapidly, that is, in the T3 stage. At this time, since the holding current of the SSV valve in the present invention has been improved, the current of the SSV valve can be effectively increased within 10ms to counteract the abnormal closing phenomenon.

[0074] Obviously, the present invention can predict the driver's emergency braking needs and increase the SSV valve opening maintenance current to a higher level before the brake pedal is urgently stepped on. This can optimize the SSV valve small maintenance current strategy and the abnormal valve closing problem and target pressure nonlinearity problem caused by quickly stepping on the brake pedal.

[0075] The present invention also provides a solenoid valve control system, please refer to Figure 4 As shown, including:

[0076] The prediction module obtains the action information of each preset module of the vehicle at the current moment, and determines the urgency of the vehicle in a future preset time period based on the action information;

[0077] A pre-action module, which determines a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve;

[0078] A control module controls the solenoid valve according to the target maintaining current.

[0079] Further, in one embodiment, the prediction module includes:

[0080] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0081] The degree of urgency is determined according to the opening size in the current throttle opening information.

[0082] Furthermore, in another embodiment, the prediction module includes:

[0083] When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time;

[0084] The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

[0085] Furthermore, the prediction module also includes:

[0086] When the assisted driving system is turned on, a preset input signal of the assisted driving system is obtained, and the degree of urgency is determined according to the preset input signal.

[0087] Furthermore, in the prediction module, the preset input signal includes: at least one of virtual throttle opening information, vehicle target deceleration information, automatic warning braking module trigger signal, automatic braking pre-filling module trigger signal and automatic emergency braking module trigger signal.

[0088] The present invention also provides an electronic device, comprising a memory, a processor, and a program stored in the memory and running on the processor, wherein the processor implements the solenoid valve control method as described above when executing the program.

[0089] The present invention also provides a vehicle, characterized in that the vehicle is equipped with an electronic device as described above.

[0090] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0091] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0093] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A solenoid valve control method, characterized in that: include: Obtaining the action information of each preset module of the vehicle at the current moment, and determining the urgency of the vehicle in a future preset time period based on the action information; Determining a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve; The solenoid valve is controlled according to the target maintaining current.

2. A solenoid valve control method according to claim 1, characterized in that: The obtaining of the action information of each preset module of the vehicle at the current moment, and determining the urgency of the vehicle in a future preset time period according to the action information, includes: When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time; The emergency level is determined according to the opening size in the current throttle opening information.

3. A solenoid valve control method according to claim 2, characterized in that: Determining the emergency level according to the current throttle opening includes: The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

4. A solenoid valve control method according to claim 1 or 3, characterized in that: Also includes: When the assisted driving system is turned on, a preset input signal of the assisted driving system is obtained, and the degree of urgency is determined according to the preset input signal.

5. A solenoid valve control method according to claim 4, characterized in that: The preset input signal includes: at least one of virtual throttle opening information, vehicle target deceleration information, automatic warning braking module trigger signal, automatic braking pre-filling module trigger signal and automatic emergency braking module trigger signal.

6. A solenoid valve control system, characterized in that: include: The prediction module obtains the action information of each preset module of the vehicle at the current moment, and determines the urgency of the vehicle in a future preset time period based on the action information; A pre-action module, which determines a target holding current of the solenoid valve according to the emergency level and the current holding current of the solenoid valve; A control module controls the solenoid valve according to the target maintaining current.

7. A solenoid valve control system according to claim 6, characterized in that: The prediction module includes: When the assisted driving system is not turned on, the vehicle throttle opening information is obtained in real time; The emergency level is determined by combining the opening size and the opening change rate in the current throttle opening information.

8. A solenoid valve control system according to claim 6 or 7, characterized in that: The prediction module also includes: When the assisted driving system is turned on, a preset input signal of the assisted driving system is obtained, and the degree of urgency is determined according to the preset input signal.

9. An electronic device comprising a memory, a processor, and a program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the solenoid valve control method according to any one of claims 1 to 5 is implemented.

10. A vehicle, characterized in that: The vehicle is equipped with an electronic device as claimed in claim 9.

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