CN111645656A - Control method of electric vacuum system and electric vacuum system - Google Patents
Control method of electric vacuum system and electric vacuum system Download PDFInfo
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- CN111645656A CN111645656A CN201911111519.6A CN201911111519A CN111645656A CN 111645656 A CN111645656 A CN 111645656A CN 201911111519 A CN201911111519 A CN 201911111519A CN 111645656 A CN111645656 A CN 111645656A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
Abstract
The invention discloses a control method of an electric vacuum system, which comprises the following steps: detecting the absolute vacuum degree of the electric vacuum system in real time through a vacuum degree detector; the electric vacuum pump controller fully considers the use working condition of the vehicle according to the working mode of the absolute vacuum degree control electric vacuum pump, the working mode of the electric vacuum pump is divided into an overheating protection working mode, a normal control mode and a safety control mode, under the premise of fully ensuring the safety of braking, the functions of the electric vacuum pump are controlled to be diversified, the humanized level of vehicle use and the experience of the use of a customer are improved, and the braking safety is greatly improved. The invention also provides an electric vacuum system which can execute the control method of the electric vacuum system, has diversified functions and improves the humanization level of vehicle use and the experience of use of customers.
Description
Technical Field
The invention relates to the technical field of automobile manufacturing, in particular to a control method of an electric vacuum system and the electric vacuum system.
Background
Modern automobiles are all provided with a brake auxiliary power-assisted system, a conventional fuel vehicle provides a vacuum source for an engine to assist power, electric automobiles do not have the vacuum power-assisted source, an Electronic Vacuum Pump (EVP) is used for providing an auxiliary vacuum source, and the existing electric vacuum pump is single in control and operation functions, such as only simply setting opening and closing threshold values, and does not fully consider comprehensive working conditions of vehicle use.
Disclosure of Invention
The invention aims to solve the problem that the control operation function of the electric vacuum pump in the prior art is single.
In order to solve the technical problem, the embodiment of the invention discloses a control method of an electric vacuum system, which comprises the following steps: detecting the absolute vacuum degree of the electric vacuum system in real time through a vacuum degree detector; the electric vacuum pump controller controls the operating mode of the electric vacuum pump according to the absolute vacuum degree, and the operating mode includes an overheat protection operating mode, a normal control mode and a safety control mode.
By adopting the technical scheme, the working condition of the vehicle is fully considered, the working mode of the electric vacuum pump is divided into an overheating protection working mode, a normal control mode and a safety control mode, the functions of controlling the electric vacuum pump are diversified on the premise of fully ensuring the braking safety, the humanization level of the vehicle use and the use experience of customers are improved, and the braking safety is greatly improved.
According to another specific embodiment of the present invention, in the control method of the electric vacuum system disclosed in the embodiment of the present invention, when the absolute vacuum degree is smaller than the absolute preset opening threshold, the electric vacuum pump adopts the overheat protection operating mode.
By adopting the technical scheme, when the absolute vacuum degree is smaller than the absolute preset opening threshold value, the electric vacuum pump needs to be started to perform air exhaust work, in the process, in order to prevent the electric vacuum pump from generating overheating phenomenon in the air exhaust process, whether the electric vacuum pump has overheating phenomenon or not needs to be judged according to the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time in a certain period of time, so that the safety of the electric vacuum pump is ensured.
According to another embodiment of the present invention, a method for controlling an electric vacuum system according to an embodiment of the present invention includes the following steps when an overheat protection operation mode is adopted for an electric vacuum pump:
(1) starting the electric vacuum pump and operating for a first preset time;
(2) after the operation is carried out for the first preset time period, wherein,
if the absolute vacuum degree is higher than the absolute vacuum degree warning value within the second preset time length, closing the electric vacuum pump; after continuing pausing for a second preset time, if the absolute vacuum degree is lower than an absolute preset starting threshold value, starting the electric vacuum pump to operate again;
and if the absolute vacuum degree is lower than the absolute vacuum degree warning value, the electric vacuum pump continues to operate.
By adopting the technical scheme, whether the electric vacuum pump has an overheating phenomenon or not is judged according to the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time in a certain period of time, so that when the safety of the electric vacuum pump is ensured, the following two conditions exist after the electric vacuum pump is started and operated for a first preset time (such as 30 seconds) through presetting a first preset time: and the first is as follows: if the absolute vacuum degree of the electric vacuum system is higher than the absolute vacuum degree warning value (such as 25 kilopascals) within a second preset time (such as 10 seconds), the electric vacuum pump is closed to ensure the rest time of the second preset time, and then after the second preset time, if the absolute vacuum degree is lower than an absolute preset opening threshold value (such as 45 kilopascals), the electric vacuum pump is started to operate again; and the second method comprises the following steps: and if the absolute vacuum degree is lower than the absolute vacuum degree warning value, the electric vacuum pump continues to operate. Through the process, when the normal operation of the electric vacuum pump is ensured, the safety of the electric vacuum pump is considered, and damage caused by overheating is prevented.
According to another embodiment of the present invention, in the control method of the electric vacuum system disclosed in the embodiment of the present invention, when the absolute vacuum degree is greater than the absolute preset opening threshold, the electric vacuum pump adopts the normal control mode.
By adopting the technical scheme, when the absolute vacuum degree is greater than the absolute preset opening threshold value, the electric vacuum pump needs to be started to perform air exhaust work so that the absolute vacuum degree of the electric vacuum system reaches the absolute preset closing threshold value, and in the process, the absolute vacuum degree of the electric vacuum system needs to be detected by the vacuum degree detector in real time so as to ensure that the electric vacuum pump is closed after the absolute vacuum degree of the electric vacuum system reaches the absolute preset threshold value.
According to another embodiment of the present invention, a method for controlling an electric vacuum system according to an embodiment of the present invention includes the steps of, when the electric vacuum pump adopts a normal control mode:
(1) starting an electric vacuum pump to pump air;
(2) and after the absolute vacuum degree reaches an absolute preset closing threshold value, closing the electric vacuum pump.
By adopting the technical scheme, the electric vacuum pump is started to exhaust air, and in the process, the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time is required to ensure that the electric vacuum pump is closed after the absolute vacuum degree of the electric vacuum system reaches the absolute preset threshold value.
According to another embodiment of the present invention, a method for controlling an electric vacuum system according to an embodiment of the present invention includes: monitoring absolute vacuum degree, calculating air extraction rate and detecting fault judgment.
By adopting the technical scheme, in order to ensure the safety of the electric vacuum system, the absolute vacuum degree needs to be monitored, the air extraction rate needs to be calculated, the fault detection judgment needs to be carried out and the like, and whether the electric vacuum system has faults or not is respectively judged from the three aspects, so that related personnel can conveniently and timely eliminate the faults, and the safety and the reliability of the whole electric vacuum system are ensured.
According to another specific embodiment of the present invention, in the control method of the electric vacuum system disclosed in the embodiment of the present invention, when the absolute vacuum degree is monitored, the absolute vacuum degree reaches an absolute preset closing threshold, and at this time, the electric vacuum pump is closed, and whether the vehicle is in a braking state is detected by the brake switch.
By adopting the technical scheme, whether the automobile is in a braking state or not is detected through the brake switch, and when the automobile is in a non-braking state, the absolute vacuum degree is monitored so as to judge whether the electric vacuum system leaks or not and ensure the safety of the electric vacuum system.
According to another embodiment of the present invention, a method for controlling an electric vacuum system is disclosed, wherein when an automobile is in a braking state, an absolute vacuum level is not monitored;
monitoring the absolute vacuum degree when the automobile is in a non-braking state, wherein:
(1) when the reduction rate of the absolute vacuum degree is lower than the preset reduction rate, the electric vacuum system is well sealed, and the display of the automobile instrument is unchanged;
(2) when the reduction rate of the absolute vacuum degree is higher than the preset reduction rate and the continuous monitoring preset times are all higher than the preset reduction rate, the electric vacuum system breaks down, a signal of the fault is sent to the instrument, and a brake fault lamp on the instrument is turned on.
By adopting the technical scheme, when the reduction rate of the absolute vacuum degree is lower than the preset reduction rate (for example, 2 kPa per 5 seconds), the electric vacuum system is judged to be well sealed, no fault exists in the electric vacuum system at the moment, a signal of no fault is sent to an instrument of an instrument automobile, and the instrument display of the automobile is unchanged at the moment; when the reduction rate of the absolute vacuum degree is higher than a preset reduction rate (for example, 2 kilopascals per 5 seconds), and the preset times (for example, 3 times) are continuously monitored, and the reduction rates of the absolute vacuum degree are higher than the preset reduction rate (for example, 2 kilopascals per 5 seconds), it is determined that the electric vacuum system has a fault, a fault signal is sent to the instrument, and a brake fault lamp on the instrument is turned on to warn relevant personnel to timely remove the fault, so that the safety of the electric vacuum system is ensured.
According to another specific embodiment of the present invention, in the method for controlling an electric vacuum system according to the embodiment of the present invention, when the pumping rate is calculated, the absolute vacuum degree is between the absolute preset opening threshold and the absolute preset closing threshold, and the pumping rate is calculated by the following formula:
SP＝V/t*Ln(P1/P2)
wherein SP is the pumping speed, and the unit is L/s; v is the volume of the vacuum electric pump; p1 is an absolute preset opening threshold; p2 is the absolute preset closing threshold, and t is the length of time that the absolute vacuum degree is from the absolute preset opening threshold to the absolute preset closing threshold.
By adopting the technical scheme, the volume of the vacuum electric pump is controlled by the air pumping speed; absolutely presetting an opening threshold value; and (4) absolutely presetting a closing threshold value, and calculating the time length from the absolutely presetting opening threshold value to the absolutely presetting closing threshold value of the absolute vacuum degree to obtain the air pumping speed.
According to another embodiment of the present invention, a method for controlling an electric vacuum system is disclosed, wherein when a vehicle is in a braking state, a pumping rate is not calculated;
when the vehicle is in a non-braking state, the air extraction rate, wherein:
(1) when the air extraction rate is greater than the preset air extraction rate, the air extraction performance of the electric vacuum pump is normal, and the display of the automobile instrument is unchanged;
(2) when the air pumping speed is less than or equal to the preset air pumping speed and the air pumping speeds calculated by the preset times are less than or equal to the preset air pumping speed, the fact that the air pumping performance of the electric vacuum pump is faulty is judged, a fault signal is sent to the instrument, and a brake fault lamp on the instrument is turned on.
By adopting the technical scheme, after the air extraction rate is obtained through calculation, when the air extraction rate is greater than the preset air extraction rate (for example, 0.39 liters per second), the air extraction performance of the electric vacuum pump is judged to be normal, at the moment, no fault exists in the electric vacuum system, a signal of no fault is sent to an instrument of an instrument automobile, and at the moment, the instrument display of the automobile is unchanged; when the air extraction rate is less than or equal to a preset air extraction rate (such as 0.39 liters per second) and the air extraction rates calculated by preset times (such as 3 times) are less than or equal to the preset air extraction rate, the air extraction performance of the electric vacuum pump is judged to be faulty, a fault signal is sent to an instrument, a brake fault lamp on the instrument is turned on, related personnel are warned to timely remove the fault, and the safety of the electric vacuum system is ensured.
According to another embodiment of the present invention, a method for controlling an electric vacuum system according to an embodiment of the present invention includes:
when no absolute vacuum degree signal or signal is lost, the vacuum degree detector is defined to be invalid, the invalid signal is sent to an instrument of the automobile, and a brake fault lamp on the instrument is turned on.
By adopting the technical scheme, when the vacuum degree detector cannot detect the signal of the absolute vacuum degree, the vacuum degree detector is judged to be invalid, the invalid signal is sent to an instrument of the automobile, and a brake fault lamp on the instrument is turned on so as to warn related personnel to remove the fault in time and ensure the safety of the electric vacuum system.
The invention also provides an electric vacuum system, which comprises an electric vacuum pump, an electric vacuum pump controller, a vacuum pipeline system, a vacuum tank assembly, a vacuum degree detector and a vacuum booster, wherein the vacuum pipeline system is used for connecting the electric vacuum pump, the vacuum tank assembly and the vacuum booster, the electric vacuum pump controller is used for controlling the working mode of the electric vacuum pump, the vacuum tank assembly is used for storing a vacuum gas source, the vacuum degree detector detects the vacuum degree of the electric vacuum system in real time, and the electric vacuum system executes the control method of the electric vacuum system.
By adopting the technical scheme, the electric vacuum system provided by the invention can divide the working mode of the electric vacuum pump into an overheating protection working mode, a normal control mode and a safety control mode through the control method of the electric vacuum system, and on the premise of fully ensuring the braking safety, the functions of controlling the electric vacuum pump are diversified, so that the humanization level of vehicle use and the experience of use of customers are improved, and the braking safety is greatly improved.
The invention has the beneficial effects that:
the invention provides a control method of an electric vacuum system, which comprises the following steps: detecting the absolute vacuum degree of the electric vacuum system in real time through a vacuum degree detector; the electric vacuum pump controller controls the operating mode of the electric vacuum pump according to the absolute vacuum degree, and the operating mode includes an overheat protection operating mode, a normal control mode and a safety control mode. The invention fully considers the use working condition of the vehicle, divides the working mode of the electric vacuum pump into an overheating protection working mode, a normal control mode and a safety control mode, controls the functions of the electric vacuum pump to be diversified on the premise of fully ensuring the braking safety, improves the humanization level of the vehicle use and the use experience of customers, and greatly improves the braking safety.
Drawings
Fig. 1 is a flowchart illustrating a method for controlling an electric vacuum system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
In order to solve the problem that the control operation function of the electric vacuum pump in the prior art is relatively single, as shown in fig. 1, an embodiment of the present embodiment discloses a control method of an electric vacuum system, which includes the following steps: detecting the absolute vacuum degree of the electric vacuum system in real time through a vacuum degree detector; the electric vacuum pump controller controls the operating mode of the electric vacuum pump according to the absolute vacuum degree, and the operating mode includes an overheat protection operating mode, a normal control mode and a safety control mode.
Specifically, the operating mode of vehicle is fully considered to this embodiment, divide into overheat protection mode, normal control mode, safety control mode to the mode of electric vacuum pump, fully ensures under the safe prerequisite of braking, and the function of control electric vacuum pump is diversified, has improved the humanized level of vehicle use and customer's experience sense of using, has improved braking security simultaneously by a wide margin.
According to another specific implementation manner of this embodiment, in the control method of the electric vacuum system disclosed in the implementation manner of this embodiment, when the absolute vacuum degree is smaller than the absolute preset opening threshold, the electric vacuum pump needs to be started to perform the pumping operation, and in this process, in order to prevent the electric vacuum pump from overheating during the pumping process, it is necessary to determine whether the electric vacuum pump is overheated according to the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time within a certain period of time, so as to ensure the safety of the electric vacuum pump. In this embodiment, the absolute opening threshold is set to be 45 kpa, or the preset absolute opening threshold may be adjusted according to the vehicle speed, for example, when the vehicle speed is less than 60 km/h, the absolute opening threshold is set to be 45 kpa, for example, when the vehicle speed is greater than 60 km/h, the absolute opening threshold is set to be 55 kpa, specifically, the absolute opening threshold may be set according to an actual situation, which is not limited in this embodiment.
According to another specific implementation manner of this embodiment, the control method of the electric vacuum system disclosed in the implementation manner of this embodiment includes the following steps when the electric vacuum pump adopts the overheat protection operation mode:
(1) starting the electric vacuum pump and operating for a first preset time;
(2) after the operation is carried out for the first preset time period, wherein,
if the absolute vacuum degree is higher than the absolute vacuum degree warning value within the second preset time length, closing the electric vacuum pump; after continuing pausing for a second preset time, if the absolute vacuum degree is lower than an absolute preset starting threshold value, starting the electric vacuum pump to operate again;
and if the absolute vacuum degree is lower than the absolute vacuum degree warning value, the electric vacuum pump continues to operate.
Specifically, whether the electric vacuum pump is overheated or not is judged according to the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time within a certain period of time, so as to ensure the safety of the electric vacuum pump, for example, a first preset time period can be preset, and the following two conditions exist after the electric vacuum pump is started and operates for the first preset time period (for example, 30 seconds):
the first method comprises the following steps: if the absolute vacuum degree of the electric vacuum system is higher than the absolute vacuum degree warning value (such as 25 kilopascals) within a second preset time (such as 10 seconds), the electric vacuum pump is closed, the rest time of the second preset time (such as 10 seconds) is guaranteed, and then after the rest time of the second preset time (such as 10 seconds), if the absolute vacuum degree is lower than an absolute preset opening threshold value (such as 45 kilopascals), the electric vacuum pump is started to operate again; specifically, the first preset time period (for example, 30 seconds) is a continuous operation time of the electric vacuum pump, for example, after the electric vacuum pump operates for 30 seconds, the electric vacuum pump may be forcibly stopped for 10 seconds, so as to prevent the electric vacuum pump from overheating, resulting in overheating failure thereof, and also improve the service life thereof. Meanwhile, if the absolute vacuum degree is lower than the absolute vacuum degree warning value by 25 kilopascals within 10 seconds of stopping operation, the electric vacuum pump is started to continue to operate, the braking safety is put at the first position, and the priority of the braking performance is ensured.
And the second method comprises the following steps: if the absolute vacuum degree is lower than the absolute vacuum degree warning value, the electric vacuum pump continues to operate to ensure the braking safety of the automobile. Through the process, when the normal operation of the electric vacuum pump is ensured, the safety of the electric vacuum pump is considered, and damage caused by overheating is prevented. In this embodiment, the absolute vacuum level guard is set to 25 kpa.
According to another specific implementation manner of this embodiment, in the control method of the electric vacuum system disclosed in the implementation manner of this embodiment, when the absolute vacuum degree is greater than the absolute preset opening threshold, the electric vacuum pump adopts the normal control mode, at this time, the electric vacuum pump needs to be started to perform pumping operation so that the absolute vacuum degree of the electric vacuum system reaches the absolute preset closing threshold, and in this process, the absolute vacuum degree of the electric vacuum system needs to be detected by the vacuum degree detector in real time, so as to ensure that the absolute vacuum degree of the electric vacuum system reaches the absolute preset threshold, and then the electric vacuum pump is closed. In this embodiment, an absolute preset opening threshold is set to 45 kpa; the absolute preset shut-off threshold is set at 75 kpa. The electric vacuum pump and the vacuum degree detector are common vacuum degree detectors in the prior art, so model examples are not carried out here, and the vacuum degree detectors are selected according to actual needs.
According to another specific implementation manner of this embodiment, the implementation manner of this embodiment discloses a control method of an electric vacuum system, when the electric vacuum pump adopts a normal control mode, the control method includes the following steps: and starting the electric vacuum pump to extract air, wherein the absolute vacuum degree of the electric vacuum system detected by the vacuum degree detector in real time is required in the process so as to ensure that the electric vacuum pump is closed after the absolute vacuum degree of the electric vacuum system reaches an absolute preset threshold value. On the premise of fully ensuring the braking safety of the automobile, the durability of the electric vacuum system is fully considered.
According to another specific implementation manner of this embodiment, in order to ensure the safety of the electric vacuum system, the control method of the electric vacuum system disclosed in the implementation manner of this embodiment needs to monitor the absolute vacuum degree, calculate the pumping rate, detect the fault, and the like, and respectively determine whether the electric vacuum system has a fault from the above three aspects, so as to facilitate the relevant personnel to remove the fault in time, and ensure the safety and reliability of the whole electric vacuum system.
According to another specific implementation manner of this embodiment, in the control method of the electric vacuum system disclosed in the implementation manner of this embodiment, when the absolute vacuum degree is monitored, the absolute vacuum degree reaches an absolute preset closing threshold value, at this time, the electric vacuum pump is closed, and whether the vehicle is in a braking state is detected through the brake switch. When the automobile is in a non-braking state, the absolute vacuum degree of the automobile is monitored to judge whether the electric vacuum system leaks or not so as to ensure the safety of the electric vacuum system.
According to another specific implementation manner of the embodiment, the implementation manner of the embodiment discloses a control method of an electric vacuum system, when an automobile is in a braking state, absolute vacuum degree is not monitored; when the automobile is in a non-braking state, monitoring the absolute vacuum degree, wherein when the reduction rate of the absolute vacuum degree is lower than a preset reduction rate (for example, 2 kilopascals per 5 seconds), the electric vacuum system is judged to be well sealed, no fault exists in the electric vacuum system at the moment, a signal of no fault is sent to an instrument of an instrument automobile, and the instrument display of the automobile is unchanged at the moment; when the reduction rate of the absolute vacuum degree is higher than a preset reduction rate (for example, 2 kilopascals per 5 seconds), and the preset times (for example, 3 times) are continuously monitored, and the reduction rates of the absolute vacuum degree are higher than the preset reduction rate (for example, 2 kilopascals per 5 seconds), it is determined that the electric vacuum system has a fault, a fault signal is sent to the instrument, and a brake fault lamp on the instrument is turned on to warn relevant personnel to timely remove the fault, so that the safety of the electric vacuum system is ensured. Meanwhile, fault information is displayed through the automobile instrument, visual reminding of instrument faults is achieved, and relevant personnel can be warned in time to carry out troubleshooting. In addition, when the electric vacuum system is detected to be out of order, the absolute opening threshold value can be raised to 55 kilopascals, so that the automobile can continue to run, and can be driven to a maintenance shop for maintenance.
According to another specific implementation manner of this embodiment, in the control method of the electric vacuum system disclosed in the implementation manner of this embodiment, when the pumping rate is calculated, the absolute vacuum degree is between the absolute preset opening threshold and the absolute preset closing threshold, and the pumping rate is calculated by the following formula: SP ═ V/t × Ln (P1/P2); wherein SP is the pumping speed, and the unit is L/s; v is the volume of the vacuum electric pump; p1 is an absolute preset opening threshold; p2 is an absolute preset closing threshold value, and t is the time length from the absolute preset opening threshold value to the absolute preset closing threshold value of the absolute vacuum degree, so that the air suction speed is calculated.
When the automobile is in a braking state, the air suction rate is not calculated; when the automobile is in a non-braking state, after the air extraction rate is calculated, when the air extraction rate is greater than a preset air extraction rate (for example, 0.39 liters per second), the air extraction performance of the electric vacuum pump is judged to be normal, at the moment, no fault exists in an electric vacuum system, a signal of no fault is sent to an instrument of an instrument automobile, and at the moment, the instrument display of the automobile is unchanged; when the air extraction rate is less than or equal to a preset air extraction rate (such as 0.39 liters per second) and the air extraction rates calculated by preset times (such as 3 times) are less than or equal to the preset air extraction rate, the air extraction performance of the electric vacuum pump is judged to be faulty, a fault signal is sent to an instrument, a brake fault lamp on the instrument is turned on, related personnel are warned to timely remove the fault, and the safety of the electric vacuum system is ensured. In this embodiment, t may be preset to 18 seconds, or may be set according to an actual situation, which is not specifically limited in this embodiment. In addition, the volume of the vacuum electric pump can be set to be 8 liters, and the absolute preset starting threshold value is set to be 45 kilopascals; the absolute preset shut-off threshold is set at 75 kpa, at which time the preset pumping rate may be set at 0.39 liters per second.
In addition, when the electric vacuum system is detected to be out of order, the absolute opening threshold value can be raised to 55 kilopascals, so that the automobile can continue to run, and can be driven to a maintenance shop for maintenance.
In addition, when the absolute vacuum degree of the vehicle is lower than 25 kilopascals and the duration time is longer than 3 seconds during running, the electric vacuum system is judged to be seriously leaked or the electric vacuum pump is seriously damaged, and at the moment, the instrument displays a fault and reminds related personnel to stop the vehicle immediately. But when the vehicle is not started, the absolute vacuum degree is lower than 25 kilopascals, and no fault display or warning is carried out.
According to another specific implementation manner of this embodiment, in the control method of the electric vacuum system disclosed in the implementation manner of this embodiment, when the detection failure is determined, and when the signal of the absolute vacuum degree is not detected by the vacuum degree detector, it is determined that the vacuum degree detector is out of work, and the out-of-work is sent to the meter of the automobile, and the brake failure lamp on the meter is turned on to warn the relevant personnel to perform failure removal in time, so as to ensure the safety of the electric vacuum system.
The control method of the electric vacuum system provided by the embodiment fully considers the control methods of various working conditions such as vacuum degree leakage, no vacuum degree signal or signal loss and the like in the reuse process, covers the vehicle using working conditions comprehensively, ensures that the braking performance is prior, and carries out fault reminding on different working conditions to warn a driver of faults of the vehicle, so that the driver can pre-support the vehicle fault state in advance, and the braking safety of the whole vehicle is fundamentally improved while the humanization level of the vehicle use and the experience of the user are improved.
Example 2
The embodiment further provides an electric vacuum system (a schematic structural diagram of the embodiment is not given), which includes an electric vacuum pump, an electric vacuum pump controller, a vacuum pipeline system, a vacuum tank assembly, a vacuum degree detector and a vacuum booster, the vacuum pipeline system is used for connecting the electric vacuum pump, the vacuum tank assembly and the vacuum booster, the electric vacuum pump controller is used for controlling the working mode of the electric vacuum pump, the vacuum tank assembly is used for storing a vacuum air source, the vacuum degree detector detects the vacuum degree of the electric vacuum system in real time, the electric vacuum system executes the control method of the electric vacuum system of embodiment 1, the working mode of the electric vacuum pump can be divided into an overheat protection working mode, a normal control mode and a safety control mode by the control method of the electric vacuum system, on the premise of fully ensuring the braking safety, the functions of controlling the electric vacuum pump are diversified, the humanized level of vehicle use and the experience of customer's use are improved, the braking security has been improved simultaneously by a wide margin.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (12)
1. A method of controlling an electrokinetic vacuum system, comprising the steps of:
detecting the absolute vacuum degree of the electric vacuum system in real time through a vacuum degree detector;
the electric vacuum pump controller controls the working mode of the electric vacuum pump according to the absolute vacuum degree, wherein the working mode comprises an overheat protection working mode, a normal control mode and a safety control mode.
2. The method of claim 1, wherein the electro-vacuum pump employs the over-temperature protection mode of operation when the absolute vacuum level is less than an absolute preset turn-on threshold.
3. A method of controlling an electric vacuum system according to claim 2, wherein when the electric vacuum pump adopts the overheat protection mode of operation, the method comprises the steps of:
(1) starting the electric vacuum pump and operating for a first preset time;
(2) after the first preset time period is operated, wherein,
if the absolute vacuum degree is higher than the absolute vacuum degree warning value within a second preset time period, closing the electric vacuum pump; after the second preset duration is continuously paused, if the absolute vacuum degree is lower than the absolute preset starting threshold value, starting the electric vacuum pump to operate again;
and if the absolute vacuum degree is lower than the absolute vacuum degree warning value, the electric vacuum pump continues to operate.
4. The method of claim 1, wherein the electric vacuum pump adopts a normal control mode when the absolute vacuum degree is greater than an absolute preset opening threshold.
5. The method of controlling an electric vacuum system according to claim 4, wherein when the electric vacuum pump adopts a normal control mode, the method comprises the steps of:
(1) starting the electric vacuum pump to perform air extraction;
(2) and after the absolute vacuum degree reaches an absolute preset closing threshold value, closing the electric vacuum pump.
6. The method of controlling a motorized vacuum system as set forth in claim 1, wherein said safe control mode comprises: monitoring absolute vacuum degree, calculating air extraction rate and detecting fault judgment.
7. The method of claim 6, wherein the absolute vacuum level is monitored and reaches an absolute preset shut-off threshold, and the electric vacuum pump is shut off and the brake switch is used to detect whether the vehicle is in a braking state.
8. The method of controlling a motorized vacuum system according to claim 7,
when the automobile is in a braking state, the absolute vacuum degree is not monitored;
monitoring an absolute vacuum level when the vehicle is in a non-braking state, wherein:
(1) when the reduction rate of the absolute vacuum degree is lower than the preset reduction rate, the electric vacuum system is well sealed, and the display of the automobile instrument is unchanged;
(2) when the reduction rate of the absolute vacuum degree is higher than the preset reduction rate and the continuous monitoring preset times are all higher than the preset reduction rate, the electric vacuum system breaks down, a signal of the fault is sent to the instrument, and a brake fault lamp on the instrument is turned on.
9. The method of claim 6, wherein said pumping rate is calculated such that said absolute vacuum level is between an absolute preset open threshold and an absolute preset closed threshold, said pumping rate being calculated by the following equation:
SP＝V/t*Ln(P1/P2)
wherein SP is the air pumping speed, and the unit is L/s; v is the volume of the vacuum electric pump; p1 is an absolute preset opening threshold; p2 is an absolute preset closing threshold, and t is a time length from the absolute preset opening threshold to the absolute preset closing threshold of the absolute vacuum degree.
10. The method of controlling a motorized vacuum system according to claim 6,
when the automobile is in a braking state, the air pumping speed is not calculated;
calculating the air extraction rate when the vehicle is in a non-braking state, wherein:
(1) when the air pumping speed is greater than the preset air pumping speed, the air pumping performance of the electric vacuum pump is normal, and the instrument display of the automobile is unchanged;
(2) and when the air pumping rate is less than or equal to a preset air pumping rate and the air pumping rates calculated by preset times are less than or equal to the preset air pumping rate, judging that the air pumping performance of the electric vacuum pump is faulty, sending a fault signal to the instrument, and turning on a brake fault lamp on the instrument.
11. The method of controlling an electric vacuum system according to claim 6, wherein the method of detecting a failure judgment is as follows:
and when the signal of the absolute vacuum degree is not available or the signal is lost, the vacuum degree detector is defined to be invalid, the invalid signal is sent to an instrument of the automobile, and a brake fault lamp on the instrument is turned on.
12. An electric vacuum system comprising an electric vacuum pump, an electric vacuum pump controller, a vacuum piping system, a vacuum tank assembly, a vacuum degree detector and a vacuum booster, the vacuum piping system being adapted to connect the electric vacuum pump, the vacuum tank assembly and the vacuum booster, the electric vacuum pump controller being adapted to control the operation mode of the electric vacuum pump, the vacuum tank assembly being adapted to store a source of vacuum gas, the vacuum degree detector being adapted to detect the vacuum degree of the electric vacuum system in real time, characterized in that the electric vacuum system is adapted to perform the method of controlling an electric vacuum system according to any of claims 1-11.
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| WO2010034261A1 (en) * | 2008-09-28 | 2010-04-01 | Byd Company Limited | Brake vacuum boosting control system for motor vehicle and control method thereof |
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