An electric control dryer control system and control method thereof

Abstract

The present application relates to an electric-controlled dryer control system and control method. Based on the judgment information at the current moment, the operating mode of the dryer at the current moment is judged, so as to know the current operating mode; based on the judgment information at the next moment, the operating mode to be switched is determined, and the operating mode to be switched is operated at the next moment, so as to know the operating mode corresponding to the next working condition; then, according to the corresponding control strategy, the opening and closing of the regeneration solenoid valve and the unloading solenoid valve are controlled, and the air compressor is controlled to inflate the air storage cylinder, so as to realize the use of real-time judgment information to know the actual working condition, and then select the appropriate mode control operation according to the actual working condition, so as to dynamically control the air pressure and the water saturation of the dryer.

Description

Technical Field

[0001] The present application relates to the field of automobile dryers, and in particular to an electric dryer control system and a control method thereof. Background Art

[0002] Air dryers are currently widely used in commercial vehicles. They not only dry the air, but also function as a pressure regulating valve. Traditional mechanical air dryers cannot dynamically adjust the air pressure in the air tank, which can easily increase vehicle fuel consumption; and mechanical air dryers can only passively control the moisture in the dryer, which can easily cause the dryer to contain water, affecting the performance of the vehicle's braking system.

[0003] With the development of automobile electrification technology, the brake system in the car begins to use electric air compressors to supply air, and electric air compressors need to be equipped with electronically controlled dryers for use. Electronically controlled dryers can solve the problems of mechanical dryers. Electronically controlled dryers usually use solenoid valves to achieve the functions of unloading, reverse regeneration and re-blowing; however, there are the following problems:

[0004] There are different operating conditions when vehicles are running in different environments. Different operating conditions have different requirements for air volume and dryness. Ultimately, the air volume generated by the dryer and the dryness of the dry air cannot be matched and adjusted to the appropriate operating conditions in real time, resulting in excess or insufficient air.

[0005] In addition, the use cycle of the dryer is difficult to accurately give a reference standard due to different usage conditions, which is not conducive to the maintenance work and poses a safety hazard. Summary of the invention

[0006] The embodiment of the present application provides an electric-controlled dryer control system and a control method thereof to solve the problem in the related art that the amount of air generated by the dryer and the dryness of the dry air cannot be matched and adjusted in real time with the appropriate working conditions, resulting in excess or insufficient air.

[0007] In a first aspect, a method for controlling an electric-controlled dryer is provided, comprising:

[0008] Based on the judgment information at the current moment, the operation mode of the dryer at the current moment is judged;

[0009] Based on the judgment information at the next moment, the operation mode to be switched is determined, and the operation mode to be switched is operated at the next moment. At the same time, based on the control strategy corresponding to the operation mode to be switched, the opening and closing of the regeneration solenoid valve and the unloading solenoid valve are controlled, and the air compressor is controlled to inflate the air storage cylinder;

[0010] The judgment information includes throttle opening, actual engine output torque, brake pedal opening, ambient temperature, dryer power-on status, engine speed, vehicle speed and dryer moisture saturation.

[0011] In some embodiments, the operation mode includes a standby mode, a normal mode, a primary high gas consumption mode, a secondary high gas consumption mode, a low gas consumption mode, a heating mode, and an exhaust mode;

[0012] Based on the judgment information at the next moment, determining the operation mode to be switched includes the following steps:

[0013] If the current moment is the normal mode, when the moisture saturation of the dryer is greater than the first threshold value at the next moment, the operation mode to be switched is the first-level high gas consumption mode;

[0014] If the current moment is the normal mode, at the next moment, when the engine speed is greater than the second threshold, the actual engine output torque percentage is less than or equal to the third threshold, and the throttle opening is less than or equal to the fourth threshold, the operating mode to be switched is the secondary high gas consumption mode;

[0015] If the current moment is the normal mode, the engine speed is greater than the fifth threshold value at the next moment; or the actual engine output torque percentage is greater than or equal to the sixth threshold value at the next moment, and the throttle opening is greater than or equal to the seventh threshold value, the operating mode to be switched is the low gas consumption mode;

[0016] If the current moment is the normal mode, when the ambient temperature is less than the eighth threshold value at the next moment, the operation mode to be switched is the heating mode;

[0017] If the current moment is the normal mode, when the dryer is powered off in the next moment, the operation mode to be switched is the emptying mode.

[0018] In some embodiments, determining the operation mode to be switched based on the judgment information at the next moment further includes the following steps:

[0019] If the current moment is the secondary high gas consumption mode, and the moisture saturation of the dryer is less than the ninth threshold value in the next moment; or if the current moment is the primary high gas consumption mode, and the number of times the regeneration solenoid valve works reaches the tenth threshold value, the operation mode to be switched is the normal mode;

[0020] If the current moment is the secondary high gas consumption mode, and in the next moment the engine speed is less than or equal to the second threshold, and the actual engine output torque percentage is greater than the third threshold; or in the next moment the throttle opening is greater than the fourth threshold, then the operating mode to be switched is the normal mode;

[0021] If the current moment is the low gas consumption mode, and in the next moment the engine speed is less than or equal to the fifth threshold, or the actual engine output torque percentage is less than the sixth threshold, or the throttle opening is less than the seventh threshold, then the operating mode to be switched is the normal mode;

[0022] If the current moment is the heating mode, when the ambient temperature in the next moment is greater than the eighth threshold, the operation mode to be switched is the normal mode;

[0023] If the current moment is the emptying mode, and the dryer is powered on in the next moment, the operation mode to be switched is the waiting working mode;

[0024] If the current moment is the waiting working mode, and the engine speed is not zero at the next moment, the operating mode to be switched is the normal mode.

[0025] In some embodiments, the control strategy of the normal mode is:

[0026] When the air pressure of the air storage cylinder is less than the eleventh threshold, the unloading solenoid valve is closed and the air storage cylinder is inflated; when it is detected that the air pressure of the air storage cylinder is greater than the twelfth threshold, the unloading solenoid valve is opened and the inflation is stopped. At the same time, if it is detected that the moisture saturation of the dryer is greater than the thirteenth threshold, the regeneration solenoid valve is controlled to work until it is detected that the air pressure is less than the eleventh threshold or the moisture saturation of the dryer is less than the fourteenth threshold;

[0027] The control strategy of the heating mode is:

[0028] When it is detected that the air pressure in the air cylinder is less than the eleventh threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the fifteenth threshold value, the unloading solenoid valve is opened and the inflation is stopped, and the regeneration solenoid valve is controlled to operate and the dryer is regenerated until the air pressure is detected to be less than the eleventh threshold value or the moisture saturation of the dryer is less than the fourteenth threshold value.

[0029] In some embodiments, the control strategy of the first-level high gas consumption mode is:

[0030] When it is detected that the air pressure of the air storage cylinder is less than the eleventh threshold value, the unloading solenoid valve is closed and the air storage cylinder is inflated; when it is detected that the air pressure of the air storage cylinder is greater than the sixteenth threshold value, the unloading solenoid valve is opened, and the inflation is stopped, and the regeneration solenoid valve is controlled to work until it is detected that the air pressure is less than the eleventh threshold value or the moisture saturation of the dryer is less than the ninth threshold value;

[0031] The control strategy of the secondary high gas consumption mode is:

[0032] When it is detected that the air pressure in the air cylinder is less than the seventeenth threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the sixteenth threshold value, the unloading solenoid valve is opened and the inflation is stopped. At the same time, if the moisture saturation of the dryer is greater than the eighteenth threshold value, the regeneration solenoid valve is controlled to work until the air pressure in the air cylinder is less than the seventeenth threshold value or the moisture saturation of the dryer is less than the nineteenth threshold value.

[0033] In some embodiments, the control strategy of the low gas consumption mode is:

[0034] When it is detected that the air pressure in the air cylinder is less than the twentieth threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the eleventh threshold value, the unloading solenoid valve is opened and inflation is stopped. At the same time, if it is detected that the moisture saturation of the dryer is greater than the twenty-first threshold value, the regeneration solenoid valve is controlled to operate until the air pressure is detected to be less than the twentieth threshold value or the moisture saturation of the dryer is less than the ninth threshold value.

[0035] In some embodiments, after determining the current operating mode of the dryer and before determining the operating mode to be switched, the following steps are included:

[0036] Obtaining current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank; comparing the current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank with the corresponding standard values, and judging whether there is a fault according to the design rules; if there is a fault, executing the safety mode, stopping the step of determining the operation mode to be switched, and issuing an alarm;

[0037] When the CAN communication status of the dryer is detected to be abnormal or the EECU message is not received, the fault mode is executed and an alarm is issued.

[0038] In some embodiments, when the dryer operation mode is in any one of the normal mode, the first-level high gas consumption mode, the second-level high gas consumption mode, the low gas consumption mode and the heating mode, the moisture saturation of the dryer is calculated;

[0039] Wherein, obtaining the moisture saturation of the dryer specifically comprises the following steps:

[0040] When the air cylinder is inflated, the real-time moisture saturation in the dryer is calculated based on the air compressor speed and dryer characteristics, as well as the air cylinder pressure, ambient temperature, atmospheric pressure, ambient humidity and inflation time;

[0041] When the system is in the regeneration state, the real-time moisture saturation in the dryer is calculated based on the maximum air pressure of the air tank and the dryer characteristics, as well as the air pressure of the air tank, the ambient temperature, the atmospheric pressure, the ambient humidity and the regeneration exhaust time.

[0042] In some embodiments, the electric dryer control method further comprises the following steps:

[0043] When the dryer is in normal mode, primary high gas consumption mode, secondary high gas consumption mode, low gas consumption mode, and heating mode, the working times and time of the regeneration solenoid valve and the unloading solenoid valve are counted, and the restart volume of the dryer and the regeneration gas volume are counted according to the charging and regeneration time;

[0044] When the dryer is powered off, the unloading solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, dryer inflation volume, and dryer regeneration gas consumption obtained from the current power-on operation statistics are updated to the total working times of the unloading solenoid valve, the total working time of the regeneration solenoid valve, the total working times of the regeneration solenoid valve, the total working time of the regeneration solenoid valve, the total inflation volume of the dryer, and the total regeneration gas consumption of the dryer, and then stored.

[0045] In a second aspect, an electric dryer control system is provided, comprising:

[0046] The vehicle controller is used to control the operation of the engine starter and to obtain the throttle opening, brake pedal opening, ambient temperature and vehicle speed;

[0047] An engine controller, which is used to obtain the engine speed and the actual output torque of the engine;

[0048] A dryer controller, comprising an operation mode management module and a dryer moisture saturation calculation module; the operation mode management module stores a plurality of operation modes and is used to determine the operation mode of the dryer at the current moment based on the judgment information at the current moment; determines the operation mode to be switched based on the judgment information at the next moment, and runs the operation mode to be switched at the next moment, and at the same time, based on the control strategy corresponding to the operation mode to be switched, controls the opening and closing of the regeneration solenoid valve and the unloading solenoid valve, and controls the air compressor to inflate the air storage cylinder; a dryer moisture saturation calculation module is used to calculate the moisture saturation of the dryer in real time; wherein the judgment information includes the throttle opening, the brake pedal opening, the ambient temperature, the vehicle speed, the engine speed and the actual output torque of the engine, as well as the moisture saturation of the dryer.

[0049] The beneficial effects of the technical solution provided by this application include:

[0050] The embodiment of the present application provides an electric-controlled dryer control system and a control method thereof. Based on the judgment information at the current moment, the operating mode of the dryer at the current moment is judged, so as to know the current operating mode; based on the judgment information at the next moment, the operating mode to be switched is determined, and the operating mode to be switched is operated at the next moment, so as to know the operating mode corresponding to the next working condition; then control is performed according to the corresponding control strategy, so as to realize the use of real-time judgment information to know the actual working condition, and then select the appropriate mode control operation according to the actual working condition, so as to achieve dynamic control of air pressure and water saturation of the dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0052] Figure 1 This is a flow chart of the electric-controlled dryer control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] The embodiment of the present application provides an electric-controlled dryer control system and a control method thereof to solve the problem in the related art that the amount of air generated by the dryer and the dryness of the dry air cannot be matched and adjusted in real time with the appropriate working conditions, resulting in excess or insufficient air.

[0055] An electric dryer control system, comprising:

[0056] The vehicle controller VECU is used to operate the engine starter and obtain the throttle opening, brake pedal opening, ambient temperature and vehicle speed;

[0057] The engine controller ECM is used to obtain the engine speed and the actual output torque of the engine;

[0058] A dryer controller DCU, which is connected to the vehicle controller and the vehicle controller; a dryer controller, which includes an operation mode management module and a dryer moisture saturation calculation module; an operation mode management module, which stores multiple operation modes and is used to determine the operation mode of the dryer at the current moment based on the judgment information at the current moment; based on the judgment information at the next moment, determine the operation mode to be switched, and run the operation mode to be switched at the next moment, and at the same time, based on the control strategy corresponding to the operation mode to be switched, control the opening and closing of the regeneration solenoid valve and the unloading solenoid valve, and control the air compressor to inflate the air cylinder; a dryer moisture saturation calculation module, which is used to calculate the moisture saturation of the dryer in real time; wherein the judgment information includes throttle opening, brake pedal opening, ambient temperature, vehicle speed, engine speed and actual engine output torque, as well as the moisture saturation of the dryer.

[0059] The dryer controller DCU includes a fault diagnosis module, an operation mode management module, a dryer moisture saturation calculation module and a maintenance record maintenance module.

[0060] The above control system may of course also include an instrument IC to display the operating mode and usage status of the dryer.

[0061] The dryer controlled above is a dryer that integrates front axle / rear axle / parking air tank pressure sensors and unloading / regeneration solenoid valves. It is an electrically controlled dryer. The control system and method of this application is a set of technical solutions for optimizing its control strategy, and has been applied in the company's D760 major modified vehicle chassis controller.

[0062] See also Figure 1 , a control method for an electric controlled dryer, characterized in that it comprises:

[0063] Step 100: based on the judgment information at the current moment, determine the operation mode of the dryer at the current moment;

[0064] Step 101, based on the judgment information at the next moment, determine the operation mode to be switched, and operate the operation mode to be switched at the next moment, and at the same time control the operation of the dryer based on the control strategy corresponding to the operation mode to be switched, that is, the opening and closing of the regeneration solenoid valve and the unloading solenoid valve, and control the air compressor to inflate the air cylinder; wherein the judgment information includes throttle opening, actual engine output torque, brake pedal opening, ambient temperature, dryer power-on status, engine speed, vehicle speed and dryer moisture saturation.

[0065] Based on the judgment information at the next moment, the operating mode to be switched is determined, and the operating mode to be switched is run at the next moment, so as to know the operating mode corresponding to the next working condition; then control is performed according to the corresponding control strategy, thereby realizing the use of real-time judgment information to know the actual working condition, and then selecting the appropriate mode to control the operation according to the actual working condition, so as to achieve dynamic control of the air pressure and the water saturation of the dryer.

[0066] In some preferred embodiments, the dryer of the present application is provided with the following modes: standby mode, normal mode, primary high gas consumption mode, secondary high gas consumption mode, low gas consumption mode, heating mode and emptying mode.

[0067] The following is an introduction to how to identify and determine the mode of the dryer in step 100:

[0068] When the dryer is powered on, the engine speed and the vehicle speed are zero, the operation mode is the standby mode;

[0069] When the dryer is powered on and the engine speed is not zero, the operation mode is the normal mode;

[0070] When the dryer is powered on, the engine speed is not zero, the actual engine output torque is zero, the throttle opening is zero, and the brake pedal opening is greater than the 21st threshold (70% of the maximum travel of the brake pedal), the operating mode is the first-level high gas consumption mode, which is a situation of emergency braking or deep braking;

[0071] When the dryer is powered on, the engine speed is not zero, the actual engine output torque is zero, the throttle opening is zero, and the brake pedal opening is greater than the 22nd threshold (30% of the maximum travel of the brake pedal), the operating mode is the secondary high gas consumption mode, that is, downhill, requiring a long braking condition;

[0072] When the dryer is powered on, the engine speed is not zero, the actual engine output torque is greater than the sixth threshold (65% of the maximum output torque), and the throttle opening is greater than the seventh threshold (60% of the maximum throttle stroke), the operating mode is a low gas consumption mode, that is, high-speed stable driving, and the demand for gas volume is not large. At this time, the excess gas needs to be further dried;

[0073] When the dryer is powered on, the engine speed is not zero, and the ambient temperature is less than the eighth threshold (1°C-4°C), the operating mode is the heating mode; that is, the outside temperature is too low to prevent the dryer from freezing.

[0074] When the dryer is in a powered-off state and the engine speed is zero, the operating mode is the emptying mode.

[0075] For step 101, how to switch different operating modes according to different working conditions, there are the following instructions:

[0076] Based on the judgment information at the next moment, determining the operation mode to be switched includes the following steps:

[0077] Switching situation 1: If the current moment is the normal mode, when the moisture saturation of the dryer is greater than the first threshold value (140%, which is a relative value, and those skilled in the art express it as a relative value) at the next moment, the operation mode to be switched is the first-level high gas consumption mode;

[0078] Switching situation 2: If the current moment is the normal mode, and in the next moment the engine speed is greater than the second threshold (900rpm), the actual engine output torque percentage is less than or equal to the third threshold (0% of the maximum output torque), and the throttle opening is less than or equal to the fourth threshold (0% of the maximum throttle stroke), then the operating mode to be switched is the secondary high gas consumption mode;

[0079] Switching situation three: if the current moment is the normal mode, and the engine speed is greater than the fifth threshold value (950rpm) at the next moment; or the actual engine output torque percentage is greater than or equal to the sixth threshold value (maximum output torque 65%) at the next moment, and the throttle opening is greater than or equal to the seventh threshold value (maximum output torque 60%), the operating mode to be switched is the low gas consumption mode;

[0080] Switching situation 4: if the current moment is the normal mode, when the ambient temperature is less than the eighth threshold (1°C-4°C) at the next moment, the operating mode to be switched is the heating mode;

[0081] Switching situation 5: If the current moment is the normal mode and the dryer is in the power-off state in the next moment, the operating mode to be switched is the emptying mode.

[0082] Switching situation six: if the current moment is the secondary high gas consumption mode, and the moisture saturation of the dryer is greater than the ninth threshold value (10%) at the next moment; or if the current moment is the primary high gas consumption mode, and the number of times the regeneration solenoid valve works reaches the tenth threshold value (20 times), the operation mode to be switched is the normal mode;

[0083] Switching situation seven: if the current moment is the secondary high gas consumption mode, and in the next moment the engine speed is less than or equal to the second threshold (900rpm), the actual engine output torque percentage is greater than the third threshold (0% of the maximum output torque); or the throttle opening is greater than the fourth threshold (0% of the maximum throttle travel) in the next moment, the operating mode to be switched is the normal mode;

[0084] Switching situation eight: if the current moment is the low gas consumption mode, and in the next moment the engine speed is less than or equal to the fifth threshold value (950rpm), or the actual engine output torque percentage is less than the sixth threshold value (65% of the maximum output torque), or the throttle opening is less than the seventh threshold value (60% of the maximum throttle stroke), then the operating mode to be switched is the normal mode;

[0085] Switching situation nine: if the current moment is the heating mode, when the ambient temperature in the next moment is greater than the eighth threshold (1°C-4°C), the operating mode to be switched is the normal mode;

[0086] Switching situation 10: If the current moment is the emptying mode and the dryer is powered on in the next moment, the operation mode to be switched is the waiting working mode;

[0087] Switching situation 11: If the current moment is the waiting working mode and the engine speed is not zero at the next moment, the operating mode to be switched is the normal mode.

[0088] In step 101, each mode corresponds to a control strategy. The control strategies of each mode are introduced below:

[0089] The control strategy of normal mode is:

[0090] When the air pressure of the air storage cylinder is less than the eleventh threshold value (1100KPa), the unloading solenoid valve is closed and the air storage cylinder is inflated; when the air pressure of the air storage cylinder is detected to be greater than the twelfth threshold value (12KPa), the unloading solenoid valve is opened and the inflation is stopped. At the same time, if the moisture saturation of the dryer is detected to be greater than the thirteenth threshold value (40%), the regeneration solenoid valve is controlled to work until the air pressure is detected to be less than the eleventh threshold value (1100KPa) or the moisture saturation of the dryer is less than the fourteenth threshold value (0%);

[0091] The control strategy for heating mode is:

[0092] When it is detected that the air pressure in the air cylinder is less than the eleventh threshold value (1100KPa), the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the fifteenth threshold value (1200KPa), the unloading solenoid valve is opened and the inflation is stopped, and the regeneration solenoid valve is controlled to operate and the dryer is regenerated until the air pressure is detected to be less than the eleventh threshold value (1100KPa) or the moisture saturation of the dryer is less than the fourteenth threshold value (0%).

[0093] The control strategy of the first-level high gas consumption mode is:

[0094] When it is detected that the air pressure in the air cylinder is less than the eleventh threshold value (1100KPa), the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the sixteenth threshold value (1250KPa), the unloading solenoid valve is opened and the inflation is stopped, and the regeneration solenoid valve is controlled to operate and the dryer is regenerated until the air pressure is detected to be less than the eleventh threshold value (1100KPa) or the moisture saturation of the dryer is less than the ninth threshold value (10%).

[0095] The control strategy of the secondary high gas consumption mode is:

[0096] When it is detected that the air pressure in the air cylinder is less than the seventeenth threshold value (1150KPa), the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the sixteenth threshold value (1250KPa), the unloading solenoid valve is opened and the inflation is stopped. At the same time, if the moisture saturation of the dryer is greater than the eighteenth threshold value (50%), the regeneration solenoid valve is controlled to operate and the dryer is regenerated until the air pressure in the air cylinder is less than the seventeenth threshold value (1150KPa) or the moisture saturation of the dryer is less than the nineteenth threshold value (5%), and the regeneration solenoid valve is closed.

[0097] The control strategy of low gas consumption mode is:

[0098] When it is detected that the air pressure in the air cylinder is less than the twentieth threshold value (1050KPa), the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the eleventh threshold value (1100KPa), the unloading solenoid valve is opened and the inflation is stopped. At the same time, if it is detected that the moisture saturation of the dryer is greater than the twenty-first threshold value (60%), the regeneration solenoid valve is controlled to regenerate the dryer until the air pressure is detected to be less than the twentieth threshold value (1050KPa) or the moisture saturation of the dryer is less than the ninth threshold value (10%), and the regeneration solenoid valve is closed.

[0099] The above is an introduction to the control and switching of the operation mode management module.

[0100] In some preferred embodiments, after determining the current operating mode of the dryer and before determining the operating mode to be switched, a self-checking step is included; that is, the specific function of the fault diagnosis module is described as follows:

[0101] Obtaining current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank; comparing the current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank with the corresponding standard values, and judging whether there is a fault according to the design rules; if there is a fault, executing the safety mode, stopping the step of determining the operation mode to be switched, and issuing an alarm;

[0102] When the CAN communication status of the dryer is detected to be abnormal or the EECU message is not received, the fault mode is executed and an alarm is issued. Among them, the failure to receive the EECU message indicates that the vehicle control unit (VECU) cannot receive the signal sent by the engine control unit (EECU). Generally, there is a circuit break between the EECU and the VECU. The same fault and CAN message timeout are also circuit break problems. The abnormal CAN communication status can be obtained by the existing detection method. This article is not about how to know that there is abnormal communication, but what to do when the CAN communication status is detected to be abnormal.

[0103] That is, it can be understood that after the vehicle and the dryer are powered on, the operation mode management module switches to the standby mode, and drives the unloading / regeneration solenoid valve to perform a self-check of the solenoid valve function.

[0104] At first, the fault diagnosis management module starts to monitor the working state of the unloading / regeneration solenoid valve, and monitors the working state of the air pressure sensor of the front axle / rear axle / parking air tank at the same time. In the standby mode, if the fault diagnosis management module detects that any of the unloading / regeneration solenoid valves is in a faulty state, or the air pressure sensors of the front axle / rear axle air tank are in a faulty state, it switches to the safe mode. In the safe mode, if the fault diagnosis management module detects that the unloading / regeneration solenoid valve and the air pressure sensors of the front axle / rear axle air tank are in normal working state, it switches to the standby mode; the safe mode is the mode in which the dryer has a fault and needs to be repaired. In the standby mode, if the fault diagnosis management module detects that the CAN communication is abnormal or does not receive the relevant function message of the EECU, it switches to the fault mode. In the fault mode, if the fault diagnosis management module detects that the CAN communication vehicle and correctly receives the relevant function message of the EECU, it switches to the standby mode. In the standby mode, if it is detected that the starter is working, it enters the start-up auxiliary mode, drives the unloading solenoid valve, puts the air compressor in a no-load state, and assists the engine start. After the engine is in the normal operation mode, it switches to the normal mode.

[0105] In some preferred embodiments, in order to realize the active regeneration function of the dryer, it is necessary to detect the moisture saturation of the dryer in real time. The moisture saturation calculation module of the dryer plays the following role:

[0106] When the operation mode of the dryer is in any of the normal mode, the first-level high gas consumption mode, the second-level high gas consumption mode, the low gas consumption mode and the heating mode, the moisture saturation of the dryer is calculated;

[0107] Wherein, obtaining the moisture saturation of the dryer specifically comprises the following steps:

[0108] When the air cylinder is inflated, the real-time moisture saturation in the dryer is calculated based on the air compressor speed and dryer characteristics, as well as the air cylinder pressure, ambient temperature, atmospheric pressure, ambient humidity and inflation time; at this time, the moisture saturation in the dryer increases.

[0109] When the system is in the regeneration state, the real-time moisture saturation in the dryer is calculated based on the maximum air pressure of the air tank and the dryer characteristics, as well as the air pressure of the air tank, the ambient temperature, the atmospheric pressure, the ambient humidity and the regeneration exhaust time; at this time, the moisture saturation in the dryer decreases.

[0110] Under each specific working condition obtained above, the moisture saturation information of the dryer is updated by combining the moisture saturation increase value in the dryer and the moisture saturation decrease value in the dryer.

[0111] In some preferred embodiments, in order to clearly know the use cycle and service life of the dryer, facilitate the maintenance work and eliminate safety hazards, the present application also has the following description, that is, the functional description of the maintenance module:

[0112] The electric control dryer control method also includes the following steps:

[0113] When the dryer is in normal mode, primary high gas consumption mode, secondary high gas consumption mode, low gas consumption mode, and heating mode, the working times and time of the regeneration solenoid valve and the unloading solenoid valve are counted, and the restart volume of the dryer and the regeneration gas volume are counted according to the charging and regeneration time;

[0114] When the dryer is powered off, the unloading solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, dryer inflation volume, and dryer regeneration gas consumption obtained from the current power-on operation statistics are updated to the total working times of the unloading solenoid valve, the total working time of the regeneration solenoid valve, the total working times of the regeneration solenoid valve, the total working time of the regeneration solenoid valve, the total inflation volume of the dryer, and the total regeneration gas consumption of the dryer, and then stored.

[0115] When the total working times of the unloading solenoid valve, the total working time of the regeneration solenoid valve, the total working times of the regeneration solenoid valve, the total working time of the regeneration solenoid valve, the total air filling volume of the dryer, and the total air consumption of the dryer regeneration reach the expected values ​​respectively, the driver is reminded through the instrument to replace the dryer in time.

[0116] When a dryer replacement instruction is received, the statistical information of the total working times of the unloading solenoid valve, the total working time of the regeneration solenoid valve, the total working times of the regeneration solenoid valve, the total working time of the regeneration solenoid valve, the total air filling volume of the dryer, and the total air consumption of the dryer regeneration is cleared.

[0117] A vehicle comprises the above-mentioned electrically-controlled dryer and a corresponding electrically-controlled dryer control system, and runs the above-described electrically-controlled dryer control method.

[0118] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0119] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0120] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A control method for an electric dryer, characterized in that: It includes: Based on the judgment information at the current moment, the operation mode of the dryer at the current moment is judged; Based on the judgment information at the next moment, the operation mode to be switched is determined, and the operation mode to be switched is operated at the next moment, and at the same time, based on the control strategy corresponding to the operation mode to be switched, the opening and closing of the regeneration solenoid valve and the unloading solenoid valve are controlled, and the air compressor is controlled to inflate the air storage cylinder; the operation modes include waiting mode, normal mode, primary high gas consumption mode, secondary high gas consumption mode, low gas consumption mode, heating mode and emptying mode; Based on the judgment information at the next moment, determining the operation mode to be switched includes the following steps: If the current moment is the normal mode, when the moisture saturation of the dryer is greater than the first threshold value at the next moment, the operation mode to be switched is the first-level high gas consumption mode; If the current moment is the normal mode, at the next moment, when the engine speed is greater than the second threshold, the actual engine output torque percentage is less than or equal to the third threshold, and the throttle opening is less than or equal to the fourth threshold, the operating mode to be switched is the secondary high gas consumption mode; If the current moment is the normal mode, the engine speed is greater than the fifth threshold value at the next moment; or the actual engine output torque percentage is greater than or equal to the sixth threshold value at the next moment, and the throttle opening is greater than or equal to the seventh threshold value, the operating mode to be switched is the low gas consumption mode; If the current moment is the normal mode, when the ambient temperature is less than the eighth threshold value at the next moment, the operation mode to be switched is the heating mode; If the current moment is in normal mode, when the dryer is powered off in the next moment, the operation mode to be switched is the emptying mode; The judgment information includes throttle opening, actual engine output torque, brake pedal opening, ambient temperature, dryer power-on status, engine speed, vehicle speed and dryer moisture saturation.

2. The electric control dryer control method according to claim 1, characterized in that: Based on the judgment information at the next moment, determining the operation mode to be switched also includes the following steps: If the current moment is the secondary high gas consumption mode, and the moisture saturation of the dryer is less than the ninth threshold value in the next moment; or if the current moment is the primary high gas consumption mode, and the number of times the regeneration solenoid valve works reaches the tenth threshold value, the operation mode to be switched is the normal mode; If the current moment is the secondary high gas consumption mode, and in the next moment the engine speed is less than or equal to the second threshold, and the actual engine output torque percentage is greater than the third threshold; or in the next moment the throttle opening is greater than the fourth threshold, then the operating mode to be switched is the normal mode; If the current moment is the low gas consumption mode, and in the next moment the engine speed is less than or equal to the fifth threshold, or the actual engine output torque percentage is less than the sixth threshold, or the throttle opening is less than the seventh threshold, then the operating mode to be switched is the normal mode; If the current moment is the heating mode, when the ambient temperature in the next moment is greater than the eighth threshold, the operation mode to be switched is the normal mode; If the current moment is the emptying mode, and the dryer is powered on in the next moment, the operation mode to be switched is the waiting working mode; If the current moment is the waiting working mode, and the engine speed is not zero at the next moment, the operating mode to be switched is the normal mode.

3. The electric control dryer control method according to claim 1, characterized in that: The control strategy of the normal mode is: When the air pressure of the air storage cylinder is less than the eleventh threshold, the unloading solenoid valve is closed and the air storage cylinder is inflated; when it is detected that the air pressure of the air storage cylinder is greater than the twelfth threshold, the unloading solenoid valve is opened and the inflation is stopped. At the same time, if it is detected that the moisture saturation of the dryer is greater than the thirteenth threshold, the regeneration solenoid valve is controlled to work until it is detected that the air pressure is less than the eleventh threshold or the moisture saturation of the dryer is less than the fourteenth threshold; The control strategy of the heating mode is: When it is detected that the air pressure in the air cylinder is less than the eleventh threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the fifteenth threshold value, the unloading solenoid valve is opened and the inflation is stopped, and the regeneration solenoid valve is controlled to operate and the dryer is regenerated until the air pressure is detected to be less than the eleventh threshold value or the moisture saturation of the dryer is less than the fourteenth threshold value.

4. The electric control dryer control method according to claim 1, characterized in that: The control strategy of the first-level high gas consumption mode is: When it is detected that the air pressure of the air storage cylinder is less than the eleventh threshold value, the unloading solenoid valve is closed and the air storage cylinder is inflated; when it is detected that the air pressure of the air storage cylinder is greater than the sixteenth threshold value, the unloading solenoid valve is opened, and the inflation is stopped, and the regeneration solenoid valve is controlled to work until it is detected that the air pressure is less than the eleventh threshold value or the moisture saturation of the dryer is less than the ninth threshold value; The control strategy of the secondary high gas consumption mode is: When it is detected that the air pressure in the air cylinder is less than the seventeenth threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the sixteenth threshold value, the unloading solenoid valve is opened and the inflation is stopped. At the same time, if the moisture saturation of the dryer is greater than the eighteenth threshold value, the regeneration solenoid valve is controlled to work until the air pressure in the air cylinder is less than the seventeenth threshold value or the moisture saturation of the dryer is less than the nineteenth threshold value.

5. The electric control dryer control method according to claim 1, characterized in that: The control strategy of the low gas consumption mode is: When it is detected that the air pressure in the air cylinder is less than the twentieth threshold value, the unloading solenoid valve is closed and the air cylinder is inflated; when it is detected that the air pressure in the air cylinder is greater than the eleventh threshold value, the unloading solenoid valve is opened and inflation is stopped. At the same time, if it is detected that the moisture saturation of the dryer is greater than the twenty-first threshold value, the regeneration solenoid valve is controlled to operate until the air pressure is detected to be less than the twentieth threshold value or the moisture saturation of the dryer is less than the ninth threshold value.

6. The electric control dryer control method according to claim 1, characterized in that: After determining the current operating mode of the dryer and before determining the operating mode to be switched, the following steps are included: Obtaining current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank; comparing the current information of the unloading solenoid valve, the regeneration solenoid valve, and the air pressure sensor of the air tank with the corresponding standard values, and judging whether there is a fault according to the design rules; if there is a fault, executing the safety mode, stopping the step of determining the operation mode to be switched, and issuing an alarm; When the CAN communication status of the dryer is detected to be abnormal or the EECU message is not received, the fault mode is executed and an alarm is issued.

7. The electric control dryer control method according to claim 1, characterized in that: When the operation mode of the dryer is in any of the normal mode, the first-level high gas consumption mode, the second-level high gas consumption mode, the low gas consumption mode and the heating mode, the moisture saturation of the dryer is calculated; Wherein, obtaining the moisture saturation of the dryer specifically comprises the following steps: When the air cylinder is inflated, the real-time moisture saturation in the dryer is calculated based on the air compressor speed and dryer characteristics, as well as the air cylinder pressure, ambient temperature, atmospheric pressure, ambient humidity and inflation time; When the system is in the regeneration state, the real-time moisture saturation in the dryer is calculated based on the maximum air pressure of the air tank and the dryer characteristics, as well as the air pressure of the air tank, the ambient temperature, the atmospheric pressure, the ambient humidity and the regeneration exhaust time.

8. The electric control dryer control method according to claim 1, characterized in that: The electric control dryer control method also includes the following steps: When the dryer is in normal mode, primary high gas consumption mode, secondary high gas consumption mode, low gas consumption mode, and heating mode, the working times and time of the regeneration solenoid valve and the unloading solenoid valve are counted, and the restart volume of the dryer and the regeneration gas volume are counted according to the charging and regeneration time; When the dryer is powered off, the unloading solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, regeneration solenoid valve working times, dryer inflation volume, and dryer regeneration gas consumption obtained from the current power-on operation statistics are updated to the total working times of the unloading solenoid valve, the total working time of the regeneration solenoid valve, the total working times of the regeneration solenoid valve, the total working time of the regeneration solenoid valve, the total inflation volume of the dryer, and the total regeneration gas consumption of the dryer, and then stored.

9. An electric dryer control system, characterized in that: It includes: The vehicle controller is used to control the operation of the engine starter and to obtain the throttle opening, brake pedal opening, ambient temperature and vehicle speed; An engine controller, which is used to obtain the engine speed and the actual output torque of the engine; A dryer controller, comprising an operation mode management module and a dryer moisture saturation calculation module; An operation mode management module stores a plurality of operation modes and is used to determine the operation mode of the dryer at the current moment based on the judgment information at the current moment; determine the operation mode to be switched based on the judgment information at the next moment, and run the operation mode to be switched at the next moment, and at the same time, based on the control strategy corresponding to the operation mode to be switched, control the opening and closing of the regeneration solenoid valve and the unloading solenoid valve, and control the air compressor to inflate the air storage cylinder; a dryer moisture saturation calculation module, which is used to calculate the moisture saturation of the dryer in real time; wherein the judgment information includes the throttle opening, the brake pedal opening, the ambient temperature, the vehicle speed, the engine speed and the actual output torque of the engine, as well as the moisture saturation of the dryer; the operation modes include a waiting mode, a normal mode, a first-level high gas consumption mode, a second-level high gas consumption mode, a low gas consumption mode, a heating mode and an emptying mode; based on the judgment information at the next moment, determine the operation mode to be switched, including the following steps: If the current moment is the normal mode, when the moisture saturation of the dryer is greater than the first threshold value at the next moment, the operation mode to be switched is the first-level high gas consumption mode; If the current moment is the normal mode, at the next moment, when the engine speed is greater than the second threshold, the actual engine output torque percentage is less than or equal to the third threshold, and the throttle opening is less than or equal to the fourth threshold, the operating mode to be switched is the secondary high gas consumption mode; If the current moment is the normal mode, the engine speed is greater than the fifth threshold value at the next moment; or the actual engine output torque percentage is greater than or equal to the sixth threshold value at the next moment, and the throttle opening is greater than or equal to the seventh threshold value, the operating mode to be switched is the low gas consumption mode; If the current moment is the normal mode, when the ambient temperature is less than the eighth threshold value at the next moment, the operation mode to be switched is the heating mode; If the current moment is the normal mode, when the dryer is powered off in the next moment, the operation mode to be switched is the emptying mode.

Images