Active Intake Grille Control Method and System

Abstract

Embodiments of the present invention provide an active intake grille control method and system, which relate to the technical field of electric vehicles. The aim is to improve the problem that the control of the opening degree of the active intake grille is not accurate enough. The active intake grille control method comprises the following steps: obtaining the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery cooling requirement; controlling the grille opening degree according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery cooling requirement. The active intake grille control system comprises an intake grille controller that executes the active intake grille control method. By controlling according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery cooling requirement, various actual working conditions are met, which is more comprehensive, and the opening degree of the active intake grille can be controlled more accurately and effectively according to the specific requirements of the whole vehicle, ensuring the safety requirements of the whole vehicle thermal management and effectively reducing the wind resistance and energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and more particularly, to a method and system for controlling an active intake grille. Background Art

[0002] The research and development of new energy vehicles has become increasingly important in the automotive field, and the active intake grille has also become an important configuration for most current new energy vehicles. The change in the opening degree of the intake grille will cause changes in the effective frontal area of the vehicle's cooling system and the resistance of the internal flow, etc., thereby affecting the vehicle performance.

[0003] At present, different manufacturers mostly consider one or more situations to be involved in the control of the active intake grille, which are relatively simple. For example, only considering the control with the coolant water temperature, when the water temperature reaches a certain degree, the active intake grille opens to a corresponding angle; or simultaneously referring to the water temperature and vehicle speed to control the opening degree of the active intake grille, which is not accurate enough. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a method for controlling an active intake grille, which can improve the problem of inaccurate control of the opening degree of the active intake grille.

[0005] The objectives of the present invention also include providing a system for controlling an active intake grille, which can improve the problem of inaccurate control of the opening degree of the active intake grille.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] The embodiments of the present invention provide a method for controlling an active intake grille, including the following steps:

[0008] Obtain the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand;

[0009] Control the grille opening degree according to the vehicle speed, the ambient temperature, the fan control duty cycle, the compressor status, and the battery cooling demand.

[0010] In addition, the method for controlling an active intake grille provided by the embodiments of the present invention may further have the following additional technical features:

[0011] Optionally, the step of controlling the grille opening degree according to the vehicle speed, the ambient temperature, the fan control duty cycle, the compressor status, and the battery cooling demand includes:

[0012] If the vehicle speed is within the low-speed range, the compressor is turned on, and the battery cooling demand exists, control the grille opening degree to be high gear;

[0013] If the vehicle speed is within a low-speed range and the ambient temperature is less than the first temperature value, control the grille opening degree to increase successively from the low gear, high gear to the fully open gear as the fan control duty ratio increases;

[0014] Among them, the grille opening degree includes the fully closed gear, low gear, high gear and fully open gear. The fully closed gear is 0%, the low gear is 30%, the high gear is 60%, and the fully open gear is 90%.

[0015] Optionally, the step of controlling the grille opening degree according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state and the battery refrigeration demand includes:

[0016] If the vehicle speed is within a medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases successively from the first duty ratio, the second duty ratio to the third duty ratio, control the grille opening degree to increase successively from the low gear, the high gear to the fully open gear;

[0017] If the vehicle speed is within a medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then control the grille opening degree to increase successively from the high gear to the fully open gear;

[0018] If the vehicle speed is within a medium-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases successively from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, control the grille opening degree to increase successively from the low gear, the high gear to the fully open gear;

[0019] If the vehicle speed is within a medium-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned on, then control the grille opening degree to increase successively from the high gear to the fully open gear;

[0020] Among them, the first temperature value is less than the second temperature value; the first duty ratio is greater than the fourth duty ratio, the second duty ratio is greater than the fifth duty ratio, and the third duty ratio is greater than the sixth duty ratio.

[0021] Optionally, the step of controlling the grille opening degree according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state and the battery refrigeration demand includes:

[0022] If the vehicle speed is within a high-speed range and the ambient temperature is less than the first temperature value, then control the grille opening degree to increase successively from the fully closed gear, the low gear to the high gear as the fan control duty ratio increases;

[0023] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the seventh duty ratio, the eighth duty ratio to the ninth duty ratio, the grille opening degree is controlled to increase sequentially from the fully closed position, the low position to the high position;

[0024] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then the grille opening degree is controlled to increase sequentially from the high position to the fully open position as the fan control duty ratio increases;

[0025] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, the grille opening degree is controlled to increase sequentially from the low position, the high position to the fully open position;

[0026] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then the grille opening degree is controlled to increase sequentially from the high position to the fully open position as the fan control duty ratio increases;

[0027] Wherein, the seventh duty ratio is less than the fourth duty ratio, the eighth duty ratio is less than the fifth duty ratio, and the ninth duty ratio is less than the sixth duty ratio.

[0028] Optionally, the active intake grille control method further includes steps before the steps of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand:

[0029] Obtain the power-on signal, angle self-learning request, and angle self-learning state of the grille;

[0030] According to the power-on signal, the angle self-learning request, and the angle self-learning state, control the grille angle self-learning and the opening degree request.

[0031] Optionally, the active intake grille control method further includes steps after the step of controlling the grille angle self-learning and the opening degree request according to the power-on signal, the angle self-learning request, and the angle self-learning state, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand:

[0032] Obtain the jammed state of the grille and the angle self-learning request;

[0033] Control the torque mode and angle self-learning of the grille according to the locked-rotor state and the angle self-learning request.

[0034] Optionally, after the step of controlling the torque mode and angle self-learning of the grille according to the locked-rotor state and the angle self-learning request in the active intake grille control method, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand:

[0035] Obtain a vehicle stationary signal, a signal indicating that the compressor enters the defrost mode, and a signal indicating the waste heat recovery operating condition.

[0036] Control the grille to close, and the grille opening degree is at the fully closed position according to the vehicle stationary signal, the signal indicating that the compressor enters the defrost mode, and the signal indicating the waste heat recovery operating condition.

[0037] Wherein, the grille opening degree includes a fully closed position, a low position, a high position, and a fully open position. The fully closed position is 0%, the low position is 30%, the high position is 60%, and the fully open position is 90%.

[0038] Optionally, after the step of controlling the grille to close and the grille opening degree being at the fully closed position according to the vehicle stationary signal, the signal indicating that the compressor enters the defrost mode, and the signal indicating the waste heat recovery operating condition in the active intake grille control method, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand:

[0039] Obtain a fault signal reported by the grille controller;

[0040] Obtain a signal indicating the loss of the intake grille controller signal;

[0041] Obtain a fan fault signal;

[0042] Obtain a signal indicating the loss of an important message for interacting with the thermal management controller;

[0043] Control the grille opening degree to be at the fully open position according to the fault signal reported by the grille controller;

[0044] Control the grille opening degree to be at the fully open position according to the signal indicating the loss of the intake grille controller signal;

[0045] Control the grille opening degree to be at the fully open position according to the fan fault signal;

[0046] Control the grille opening degree to be at the fully open position according to the signal indicating the loss of an important message for interacting with the thermal management controller;

[0047] Among them, the grille opening degree includes a fully closed position, a low position, a high position, and a fully open position. The fully closed position is 0%, the low position is 30%, the high position is 60%, and the fully open position is 90%.

[0048] Optionally, before the step of controlling the grille opening degree to the fully open position according to the important message loss signal interacting with the thermal management controller in the active intake grille control method, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand:

[0049] If the fan control duty ratio is less than or equal to 60%, the thermal management controller controls the grille opening degree.

[0050] An embodiment of the present invention also provides an active intake grille control system. The active intake grille control system includes a vehicle controller, an intake grille controller, and a thermal management controller. The thermal management controller is connected to the vehicle controller through a CAN bus, the intake grille controller is connected to the vehicle controller through a LIN line, and the vehicle controller, the intake grille controller, and the thermal management controller are jointly used to execute the active intake grille control method.

[0051] The beneficial effects of the active intake grille control method and system according to the embodiments of the present invention include, for example:

[0052] The active intake grille control method includes the following steps: obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand; controlling the grille opening degree according to the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand. According to the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand, it is more comprehensive, and the active intake grille opening degree can be controlled more accurately and effectively according to the specific needs of the whole vehicle, improving the control accuracy of the active intake grille opening degree, effectively reducing wind resistance, and reducing energy consumption.

[0053] The active intake grille control system includes a vehicle controller for executing the above-mentioned active intake grille control method. It can improve the problem that the control of the active intake grille opening degree is not accurate enough. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0055] Figure 1Flow chart of the active intake grille control method provided by the embodiments of the present invention;

[0056] Figure 2 Control flow chart of the active intake grille control method provided by the embodiments of the present invention. Detailed implementation manners

[0057] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0059] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0060] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship when the product of the present invention is normally placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0061] In addition, if terms such as "first", "second", etc. are used only for differential description and cannot be construed as indicating or implying relative importance.

[0062] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0063] The following Figures 1 to 2 will describe in detail the active intake grille control method provided in this embodiment.

[0064] Please refer to Figure 1, embodiments of the present invention provide an active intake grille control method, including the following steps: obtaining vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand; controlling the grille opening according to the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand.

[0065] Controlling the grille opening according to the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand is more comprehensive, and can control the active intake grille opening more precisely and effectively according to the specific needs of the whole vehicle, which can improve the problem that the control of the active intake grille opening is not precise enough, ensure the safety requirements of the whole vehicle thermal management, and effectively reduce wind resistance and energy consumption.

[0066] In this embodiment, the step of controlling the grille opening according to the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand includes: if the vehicle speed is in the low-speed range, the compressor is turned on, and the battery cooling demand exists, then control the grille opening to be in the high gear; if the vehicle speed is in the low-speed range and the ambient temperature is less than the first temperature value, then control the grille opening to increase sequentially from the low gear, high gear to the full-open gear as the fan control duty cycle increases; wherein, the grille opening includes the full-closed gear, low gear, high gear, and full-open gear, the full-closed gear is 0%, the low gear is 30%, the high gear is 60%, and the full-open gear is 90%.

[0067] It should be noted that the "low-speed range, medium-speed range, and high-speed range" in the text can be defined. The speed in the low-speed range is less than the speed in the medium-speed range, and the speed in the medium-speed range is less than the speed in the high-speed range.

[0068] When the vehicle is driving at a low speed, if the compressor is turned on and there is a battery cooling demand, then control the grille to open in the high gear. When the vehicle is driving at a low speed and the temperature is less than a °C, the grille opening increases from low to high to full-open as the fan control duty cycle increases.

[0069] Refer to Figure 1 , in this embodiment, the step of controlling the grille opening according to the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand includes:

[0070] If the vehicle speed is in the medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty cycle increases sequentially from the first duty cycle, the second duty cycle to the third duty cycle, control the grille opening to increase sequentially from the low gear, high gear to the full-open gear;

[0071] If the vehicle speed is in the medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then control the grille opening to increase sequentially from the high gear to the full-open gear;

[0072] If the vehicle speed is within the medium speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, the control grille opening increases sequentially from the low gear, the high gear to the fully open gear;

[0073] If the vehicle speed is within the medium speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned on, then the control grille opening increases sequentially from the high gear to the fully open gear;

[0074] Wherein, the first temperature value is less than the second temperature value; the first duty ratio is greater than the fourth duty ratio, the second duty ratio is greater than the fifth duty ratio, and the third duty ratio is greater than the sixth duty ratio.

[0075] The range of the first duty ratio is 0%-40%, the range of the second duty ratio is 40%-60%, and the range of the third duty ratio is 60%-100%. The range of the fourth duty ratio is 0%-30%, the range of the fifth duty ratio is 30%-50%, and the range of the sixth duty ratio is 50%-100%.

[0076] When the vehicle is traveling at a medium speed and the ambient temperature is less than b°C and greater than a°C, if the compressor is not turned on, the grille opening increases from low to high to fully open as the fan control duty ratio increases; if the compressor is turned on, the grille opening increases from high to fully open as the fan control duty ratio increases.

[0077] When the vehicle is traveling at a medium speed and the ambient temperature is greater than b°C, if the compressor is not turned on, the grille opening increases from low to high to fully open as the fan control duty ratio increases; if the compressor is turned on, the grille opening increases from high to fully open as the fan control duty ratio increases.

[0078] Refer to Figure 1 , in this embodiment, the steps of controlling the grille opening according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery cooling demand include:

[0079] If the vehicle speed is within the high speed range and the ambient temperature is less than the first temperature value, then control the grille opening to increase sequentially from the fully closed gear, the low gear to the high gear as the fan control duty ratio increases;

[0080] If the vehicle speed is within the high speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the seventh duty ratio, the eighth duty ratio to the ninth duty ratio, control the grille opening to increase sequentially from the fully closed gear, the low gear to the high gear;

[0081] If the vehicle speed is within the high speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then control the grille opening to increase from the high gear to the fully open gear as the fan control duty ratio increases;

[0082] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, the control grille opening increases sequentially from the low gear, the high gear to the fully open gear;

[0083] If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then the control grille opening increases sequentially from the high gear to the fully open gear as the fan control duty ratio increases;

[0084] Among them, the seventh duty ratio is less than the fourth duty ratio, the eighth duty ratio is less than the fifth duty ratio, and the ninth duty ratio is less than the sixth duty ratio.

[0085] The range of the seventh duty ratio is 0%-20%, the range of the eighth duty ratio is 20%-60%, and the range of the ninth duty ratio is 60%-100%.

[0086] When the vehicle is traveling at high speed and the temperature is less than a °C, the grille opening increases from fully closed to low to high as the fan control duty ratio increases;

[0087] When the vehicle is traveling at high speed and the temperature is less than b °C and greater than a °C, if the compressor is not turned on, the grille opening increases from fully closed to low to high as the fan control duty ratio increases; if the compressor is turned on, the grille opening increases from high to fully open as the fan control duty ratio increases;

[0088] When the vehicle is traveling at high speed and the temperature is greater than b °C, if the compressor is not turned on, the grille opening increases from low to high to fully open as the fan control duty ratio increases; if the compressor is turned on, the grille opening increases from high to fully open as the fan control duty ratio increases.

[0089] It should be noted that for the first temperature value a °C and the second temperature value b °C, a hysteresis interval is set, that is, there can be an up and down floating interval.

[0090] Refer to Figure 1 , in this embodiment, the active intake grille control method further includes steps before the steps of obtaining the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery cooling demand:

[0091] Obtain the power-on signal, the angle self-learning request, and the angle self-learning status of the grille;

[0092] According to the power-on signal, the angle self-learning request, and the angle self-learning status, control the grille angle self-learning and the opening request.

[0093] When the active intake grille is powered on and works for the first time, it will enter initialization by itself and enter the self-learning mode. When the intake grille controller sends an angle self-learning request and the angle self-learning status is not activated, the vehicle controller sends an angle self-learning command. When the intake grille controller sends an angle self-learning request and the angle self-learning status is activated, during the self-learning process, the vehicle controller cancels the angle self-learning command. When the intake grille controller cancels the angle self-learning request and the angle self-learning status is activated, the self-learning is successful, and the vehicle controller can send an active intake grille opening request.

[0094] Refer to Figure 1 , in this embodiment, after the step of controlling the grille angle self-learning and the opening request according to the power-on signal, the angle self-learning request, and the angle self-learning status in the active intake grille control method, and before the step of obtaining the vehicle speed, the ambient temperature, the fan control duty cycle, the compressor status, and the battery cooling demand:

[0095] Obtain the blocked rotation state of the grille and the angle self-learning request;

[0096] Control the torque mode and the angle self-learning of the grille according to the blocked rotation state and the angle self-learning request.

[0097] After the angle self-learning is completed, a determination of whether there is a blocked rotation is made.

[0098] If there is a blocked rotation state, the "blocked rotation state" means that the active intake grille cannot work properly due to cold weather or stones, etc. At this time, according to the fault state of the active intake grille and its self-learning request, this working condition is judged. In order to prevent damage to its motor caused by blocked rotation, when the intake grille controller requests re-angle self-learning due to a blocked rotation fault, the vehicle controller sends an angle self-learning command and at the same time sends an active intake grille torque mode command as an enhanced mode. Try to exit the blocked rotation working condition through the enhanced mode. If the intake grille continuously requests angle self-learning for 80s (TBD) and fails, the vehicle controller stops the self-learning command and will respond to the self-learning command again after a period of time.

[0099] If there is no blocked rotation state, a determination of whether the forced closing condition is satisfied is made.

[0100] Refer to Figure 1 , in this embodiment, after the step of controlling the torque mode and the angle self-learning of the grille according to the blocked rotation state and the angle self-learning request in the active intake grille control method, and before the step of obtaining the vehicle speed, the ambient temperature, the fan control duty cycle, the compressor status, and the battery cooling demand:

[0101] Obtain the vehicle stationary signal, the compressor entering the defrost mode signal, and the waste heat recovery working condition signal;

[0102] According to the vehicle stationary signal, the signal that the compressor enters the defrosting mode, and the waste heat recovery working condition signal, control the grille to close, and the grille opening degree is the fully closed position;

[0103] Among them, the grille opening degree includes the fully closed position, the low gear, the high gear, and the fully open position. The fully closed position is 0%, the low gear is 30%, the high gear is 60%, and the fully open position is 90%.

[0104] If the forced closing condition is met, that is, when the vehicle is stationary, if the thermal management controller controls the compressor to enter the defrosting mode or the whole vehicle judges that it meets the condition of entering the waste heat recovery working condition, in order to ensure that the heat does not escape and reduce the energy consumption, the vehicle controller controls the grille to close and sends an opening degree request of the fully closed position.

[0105] If the forced closing condition is not met, then judge whether the fault response condition is met.

[0106] Refer to Figure 1 In this embodiment, after the step of controlling the grille to close and the grille opening degree being the fully closed position according to the vehicle stationary signal, the signal that the compressor enters the defrosting mode, and the waste heat recovery working condition signal, and before the step of obtaining the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor state, and the battery refrigeration demand, the active intake grille control method further includes the following steps:

[0107] Obtain the fault signal reported by the grille controller;

[0108] Obtain the loss of the intake grille controller signal;

[0109] Obtain the fan fault signal;

[0110] Obtain the signal loss of the important message interacting with the thermal management controller;

[0111] According to the fault signal reported by the grille controller, control the grille opening degree to the fully open position;

[0112] According to the loss of the intake grille controller signal, control the grille opening degree to the fully open position;

[0113] According to the fan fault signal, control the grille opening degree to the fully open position;

[0114] According to the signal loss of the important message interacting with the thermal management controller, control the grille opening degree to the fully open position;

[0115] Among them, the grille opening degree includes the fully closed position, the low gear, the high gear, and the fully open position. The fully closed position is 0%, the low gear is 30%, the high gear is 60%, and the fully open position is 90%.

[0116] To ensure the effectiveness and accuracy of the active intake grille control, when the parts related to the control of the intake grille fail. To ensure the safety requirements of thermal management.

[0117] When the failure response condition is met and the active intake grille controller reports a fault, when the vehicle controller sends a request for the opening of the active intake grille to be fully open, the LIN signal for the active intake grille is lost, that is, the signal of the intake grille controller is lost, and the vehicle controller sends a request for the opening of the active intake grille to be fully open. When the fan fails, the vehicle controller sends a request for the opening of the active intake grille to be fully open. When an important message interacting with the thermal management controller is lost, the vehicle controller sends a request for the opening of the active intake grille to be fully open.

[0118] If the failure response condition is not met, then it is judged whether there is a thermal management control condition.

[0119] In this embodiment, before the step of controlling the grille opening to the fully open position according to the signal of the loss of an important message interacting with the thermal management controller, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand: If the fan control duty cycle is less than or equal to 60%, the thermal management controller controls the grille opening.

[0120] If there is a thermal management control condition, then other demand mode control is performed. That is, when the fan control duty cycle is less than or equal to 60%, the thermal management controller can directly control the opening of the active intake grille through an active control signal.

[0121] If there is no thermal management control condition, then opening calculation mode control is performed. That is, the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand are obtained; according to the vehicle speed, ambient temperature, fan control duty cycle, compressor status, and battery cooling demand, the grille opening is controlled.

[0122] Refer to Figure 2 , according to an active intake grille control method provided by this embodiment, the active intake grille control method includes the following processes:

[0123] Mode 1: Self-learning mode, obtaining the power-on signal, angle self-learning request, and angle self-learning status of the grille; controlling the angle self-learning and opening request of the grille according to the power-on signal, angle self-learning request, and angle self-learning status.

[0124] Mode 2: Grille stuck mode, obtaining the stuck state and angle self-learning request of the grille; controlling the torque mode and angle self-learning of the grille according to the stuck state and angle self-learning request.

[0125] Mode 3: Forced closing mode, obtaining the vehicle stationary signal, compressor entering the defrost mode signal, and waste heat recovery working condition signal; controlling the grille to close according to the vehicle stationary signal, compressor entering the defrost mode signal, and waste heat recovery working condition signal, and the grille opening is at the fully closed position;

[0126] Mode 4: Fault response mode, obtaining the fault signal reported by the grille controller; obtaining the signal loss of the intake grille controller; obtaining the fan fault signal; obtaining the signal loss of the important message interacting with the thermal management controller; according to the fault signal reported by the grille controller, controlling the grille opening to the full open position; according to the signal loss of the intake grille controller, controlling the grille opening to the full open position; according to the fan fault signal, controlling the grille opening to the full open position; according to the signal loss of the important message interacting with the thermal management controller, controlling the grille opening to the full open position;

[0127] Mode 5: Other requirement mode, if the fan control duty ratio is less than or equal to 60%, the thermal management controller controls the grille opening.

[0128] Mode 6: Opening calculation mode, obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand; controlling the grille opening according to the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand.

[0129] The priority levels of the above active intake grille opening control modes are in turn: Mode 1 > Mode 2 > Mode 3 > Mode 4 > Mode 5 > Mode 6.

[0130] First, the self-learning mode is performed, and then it is successively judged whether there is a stall, whether the forced closing condition is satisfied, whether the fault response condition is satisfied, whether there is a thermal management control condition, and finally, the opening calculation mode is controlled.

[0131] An active intake grille control method provided by this embodiment has at least the following advantages:

[0132] Mainly based on the vehicle controller's comprehensive calculation of multiple factors such as vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand for the active intake grille opening request. It realizes multi-level opening and closing control, more precisely controls the intake grille opening, and effectively reduces wind resistance and energy consumption on the basis of meeting the vehicle's thermal management safety requirements.

[0133] At the same time, by judging the working state of the active intake grille and the working states of other relevant controllers and the opening demand for the active intake grille to determine the priority of the active intake grille control type, arbitrating the active intake grille opening request according to the control priority. Finally, the vehicle controller controls the opening of the active intake grille (active intake grille) through LIN communication, reducing wind resistance while ensuring the cooling function.

[0134] An embodiment of the present invention further provides an active intake grille control system. The active intake grille control system includes a vehicle controller, an intake grille controller, and a thermal management controller. The thermal management controller is connected to the vehicle controller via a CAN bus, and the intake grille controller is connected to the vehicle controller via a LIN line. The vehicle controller, the intake grille controller, and the thermal management controller are jointly configured to execute an active intake grille control method. It can improve the problem that the control of the opening degree of the active intake grille is not accurate enough.

[0135] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An active intake grille control method, characterized in that, It includes the following steps: Obtain vehicle speed, ambient temperature, fan control duty ratio, compressor status, and battery cooling demand; Control the grille opening according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor status, and the battery cooling demand, where: If the vehicle speed is within the low-speed range, the compressor is turned on, and the battery cooling demand exists, then control the grille opening to be at the high gear; If the vehicle speed is within the low-speed range and the ambient temperature is less than the first temperature value, then control the grille opening to increase sequentially from the low gear, high gear to the fully open gear as the fan control duty ratio increases; Among them, the grille opening includes a fully closed gear, a low gear, a high gear, and a fully open gear. The fully closed gear is 0%, the low gear is 30%, the high gear is 60%, and the fully open gear is 90%; If the vehicle speed is within the medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the first duty ratio, the second duty ratio to the third duty ratio, control the grille opening to increase sequentially from the low gear, the high gear to the fully open gear; If the vehicle speed is within the medium-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then control the grille opening to increase sequentially from the high gear to the fully open gear; If the vehicle speed is within the medium-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, control the grille opening to increase sequentially from the low gear, the high gear to the fully open gear; If the vehicle speed is within the medium-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned on, then control the grille opening to increase sequentially from the high gear to the fully open gear; Among them, the first temperature value is less than the second temperature value; the range of the first duty ratio is 0%-40%, the range of the second duty ratio is 40%-60%, and the range of the third duty ratio is 60%-100%; the range of the fourth duty ratio is 0%-30%, the range of the fifth duty ratio is 30%-50%, and the range of the sixth duty ratio is 50%-100%.

2. The active intake grille control method according to claim 1, wherein, The step of controlling the grille opening according to the vehicle speed, the ambient temperature, the fan control duty ratio, the compressor status, and the battery cooling demand includes: If the vehicle speed is within the high-speed range and the ambient temperature is less than the first temperature value, then control the grille opening to increase sequentially from the fully closed gear, the low gear to the high gear as the fan control duty ratio increases; If the vehicle speed is within the high-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the seventh duty ratio, the eighth duty ratio to the ninth duty ratio, control the grille opening to increase sequentially from the fully closed gear, the low gear to the high gear; If the vehicle speed is within the high-speed range, the ambient temperature is greater than the first temperature value and less than the second temperature value, and the compressor is turned on, then control the grille opening degree to increase sequentially from the high gear to the fully open gear as the fan control duty ratio increases; If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then when the fan control duty ratio increases sequentially from the fourth duty ratio, the fifth duty ratio to the sixth duty ratio, control the grille opening degree to increase sequentially from the low gear, the high gear to the fully open gear; If the vehicle speed is within the high-speed range, the ambient temperature is greater than the second temperature value, and the compressor is turned off, then control the grille opening degree to increase sequentially from the high gear to the fully open gear as the fan control duty ratio increases; Wherein, the seventh duty ratio is less than the fourth duty ratio, the eighth duty ratio is less than the fifth duty ratio, and the ninth duty ratio is less than the sixth duty ratio.

3. The active intake grille control method according to claim 1 or 2, characterized in that, The active intake grille control method further includes the steps before the steps of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand: Obtain the power-on signal, angle self-learning request, and angle self-learning state of the grille; Control the grille angle self-learning and opening degree request according to the power-on signal, the angle self-learning request, and the angle self-learning state.

4. The active intake grille control method according to claim 3, wherein The active intake grille control method further includes the steps after the step of controlling the grille angle self-learning and opening degree request according to the power-on signal, the angle self-learning request, and the angle self-learning state, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand: Obtain the blocked-rotor state and angle self-learning request of the grille; Control the torque mode and angle self-learning of the grille according to the blocked-rotor state and the angle self-learning request.

5. The active intake grille control method according to claim 4, wherein, The active intake grille control method further includes the steps after the step of controlling the torque mode and angle self-learning of the grille according to the blocked-rotor state and the angle self-learning request, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand: Obtain the vehicle stationary signal, the signal that the compressor enters the defrosting mode, and the waste heat recovery working condition signal; Control the grille to close, and the grille opening degree is at the fully closed gear according to the vehicle stationary signal, the signal that the compressor enters the defrosting mode, and the waste heat recovery working condition signal; Wherein, the grille opening degree includes the fully closed gear, the low gear, the high gear, and the fully open gear, the fully closed gear is 0%, the low gear is 30%, the high gear is 60%, and the fully open gear is 90%.

6. The active intake grille control method according to claim 5, characterized in that The active intake grille control method further includes, after the step of controlling the grille to close with the grille opening degree being the fully closed position according to the vehicle stationary signal, the compressor entering the defrost mode signal, and the waste heat recovery working condition signal, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand: Obtain the fault signal reported by the grille controller; Obtain the loss of the intake grille controller signal; Obtain the fan fault signal; Obtain the signal loss of the important message interacting with the thermal management controller; According to the fault signal reported by the grille controller, control the grille opening degree to the fully open position; According to the loss of the intake grille controller signal, control the grille opening degree to the fully open position; According to the fan fault signal, control the grille opening degree to the fully open position; According to the signal loss of the important message interacting with the thermal management controller, control the grille opening degree to the fully open position; Wherein, the grille opening degree includes the fully closed position, low position, high position, and fully open position. The fully closed position is 0%, the low position is 30%, the high position is 60%, and the fully open position is 90%.

7. The active intake grille control method according to claim 6, wherein, The active intake grille control method further includes, before the step of controlling the grille opening degree to the fully open position according to the signal loss of the important message interacting with the thermal management controller, and before the step of obtaining the vehicle speed, ambient temperature, fan control duty ratio, compressor state, and battery cooling demand: If the fan control duty ratio is less than or equal to 60%, the thermal management controller controls the grille opening degree.

8. An active intake grille control system, characterized in that: The active intake grille control system includes a vehicle controller, an intake grille controller, and a thermal management controller. The thermal management controller is connected to the vehicle controller through a CAN bus, the intake grille controller is connected to the vehicle controller through a LIN line, and the vehicle controller, the intake grille controller, and the thermal management controller are jointly used to execute the active intake grille control method according to any one of claims 1-7.

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