CN111959472A - Electric automobile vacuum pump redundancy control system and method and electric automobile - Google Patents
Electric automobile vacuum pump redundancy control system and method and electric automobile Download PDFInfo
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- CN111959472A CN111959472A CN202010902850.6A CN202010902850A CN111959472A CN 111959472 A CN111959472 A CN 111959472A CN 202010902850 A CN202010902850 A CN 202010902850A CN 111959472 A CN111959472 A CN 111959472A
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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
- B60T13/24—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 the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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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
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention belongs to the technical field of electric automobiles, and discloses an electric automobile vacuum pump redundancy control system and method and an electric automobile. The electric vehicle vacuum pump redundancy control system comprises a vehicle control unit and a vacuum pump controller, wherein the vehicle control unit judges whether the vacuum pump controller fails or not when receiving an output instruction of the vacuum pump controller; the vehicle control unit collects a relative pressure signal and a brake switch signal of the vacuum tank when the vacuum pump controller fails, and generates a vacuum pump control signal according to the relative pressure signal and the brake switch signal of the vacuum tank; and the vehicle control unit performs redundancy control on the vacuum pump according to the vacuum pump control signal. In the invention, the vacuum pump is executed by the vacuum pump controller under normal conditions, the vehicle control unit carries out redundancy monitoring, and when the vehicle control unit detects the failure of the vacuum pump controller, the vehicle control unit intervenes to carry out redundancy control on the vacuum pump, so that the influence of the failure of the vacuum power assistance on driving feeling and safety caused by the failure of the vacuum pump controller is avoided.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a system and a method for controlling redundancy of a vacuum pump of an electric automobile and the electric automobile.
Background
At present, an electric automobile is generally controlled by a vacuum pump, a vacuum pump controller is used for collecting a pressure switch signal or a relative pressure signal installed on a vacuum tank, when the vacuum degree is insufficient, the pressure switch jumps or the collected relative pressure value becomes low, the vacuum pump controller receives the signal to control a vacuum pump to start working, and the brake assistance is realized by vacuumizing, but the pressure switch and a pressure sensor possibly have the problem of component failure, particularly, the pressure switch is frequently switched on and off, has higher failure probability, and cannot be adapted to the brake assistance requirements of plains and high-pressure different atmospheric pressures; the failure probability of the driving circuit also exists; the vacuum pump controller has software and hardware failure probability, the failure of the components can cause the failure of the vacuum power assistance, and the brake pedal can be changed heavily to influence the driving feeling and the safety.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a system and a method for controlling the vacuum pump redundancy of an electric automobile and the electric automobile, and aims to solve the technical problem that the driving feeling and the safety are influenced due to the failure of vacuum power assistance caused by the failure of software and hardware during the control of the vacuum pump of the conventional electric automobile.
In order to achieve the above object, the present invention provides a redundancy control system for a vacuum pump of an electric vehicle, comprising: the system comprises a vehicle control unit and a vacuum pump controller, wherein the vehicle control unit is in communication connection with the vacuum pump controller; wherein the content of the first and second substances,
the vehicle control unit is used for judging whether the vacuum pump controller fails or not according to the output instruction when receiving the output instruction of the vacuum pump controller;
the vehicle control unit is also used for acquiring a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generating a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the vehicle control unit is also used for carrying out redundancy control on the vacuum pump according to the vacuum pump control signal.
Optionally, the vehicle control unit comprises an MCU circuit, a first driving circuit and a second driving circuit, the MCU circuit is connected to the first driving circuit and the second driving circuit, the first driving circuit is connected to a first vacuum pump relay, and the second driving circuit is connected to a second vacuum pump relay; wherein the content of the first and second substances,
the MCU circuit is also used for controlling the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal so as to realize redundant control of the vacuum pump;
the MCU circuit is also used for collecting the output end feedback voltage of the first vacuum pump relay and judging whether the first vacuum pump relay normally outputs or not according to the output end feedback voltage;
and the MCU circuit is also used for controlling the second vacuum pump relay through the second driving circuit according to the control signal of the vacuum pump when the abnormal output of the first vacuum pump relay is detected so as to realize the redundant control of the vacuum pump.
Optionally, the vehicle control unit includes an MCU circuit and a comparison circuit, and the MCU circuit is connected to the comparison circuit; wherein the content of the first and second substances,
the MCU circuit is used for acquiring a relative pressure signal of a vacuum tank and a brake switch signal and generating a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the comparison circuit is used for carrying out redundancy control on the vacuum pump according to the vacuum pump control signal when the MCU circuit fails.
Optionally, the electric vehicle vacuum pump redundancy control system further includes: the remote cloud server is in communication connection with the vehicle control unit; wherein the content of the first and second substances,
the remote cloud server is used for acquiring vehicle GPS positioning information in real time and determining and outputting a remote atmospheric pressure value of the current vehicle position according to the vehicle GPS positioning information, the geographic position information and the season information;
the remote cloud server is further used for reporting the remote atmospheric pressure value to the whole vehicle controller through CAN communication;
the vehicle control unit is further used for determining the relative atmospheric pressure value of the vacuum tank according to the relative pressure signal of the vacuum tank;
the vehicle control unit is also used for establishing a vacuum tank pressure model according to the remote atmospheric pressure value and the relative atmospheric pressure value of the vacuum tank;
and the vehicle control unit is further used for dynamically adjusting the opening and closing threshold values of the vacuum pump according to the vacuum tank pressure model so as to meet the vacuum assistance of a preset area.
In addition, in order to achieve the above object, the present invention further provides an electric vehicle vacuum pump redundancy control method, which is applied to the electric vehicle vacuum pump redundancy control system as described above, and the electric vehicle vacuum pump redundancy control system includes: the electric vehicle vacuum pump redundancy control method comprises the following steps:
when the vehicle control unit receives an output instruction of the vacuum pump controller, judging whether the vacuum pump controller fails according to the output instruction;
the vehicle control unit collects a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the vehicle control unit performs redundancy control on the vacuum pump according to the control signal of the vacuum pump.
Optionally, the vehicle control unit includes an MCU circuit, a first driving circuit and a second driving circuit;
the step of the vehicle control unit performing redundancy control on the vacuum pump according to the vacuum pump control signal comprises the following steps:
the MCU circuit controls the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal so as to realize redundant control of the vacuum pump;
the MCU circuit collects the output end feedback voltage of the first vacuum pump relay and judges whether the first vacuum pump relay normally outputs or not according to the output end feedback voltage;
and when the MCU circuit detects that the first vacuum pump relay does not normally output, the second vacuum pump relay is controlled through the second driving circuit according to the control signal of the vacuum pump so as to realize the redundant control of the vacuum pump.
Optionally, the vehicle control unit comprises an MCU circuit and a comparison circuit,
the step of the vehicle control unit performing redundancy control on the vacuum pump according to the vacuum pump control signal comprises the following steps:
the MCU circuit collects a relative pressure signal of the vacuum tank and a brake switch signal and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the comparison circuit performs redundancy control on the vacuum pump according to the vacuum pump control signal when the MCU circuit fails.
Optionally, the electric vehicle vacuum pump redundancy control system further includes: a remote cloud server;
after the step of performing redundancy control on the vacuum pump according to the vacuum pump control signal, the vehicle control unit further comprises:
the remote cloud server acquires vehicle GPS positioning information in real time, and determines and outputs a remote atmospheric pressure value of the current vehicle position according to the vehicle GPS positioning information, the geographic position information and the season information;
the remote cloud server reports the remote atmospheric pressure value to the whole vehicle controller through CAN communication;
the vehicle control unit determines the relative atmospheric pressure value of the vacuum tank according to the relative pressure signal of the vacuum tank;
the vehicle control unit establishes a vacuum tank pressure model according to the remote atmospheric pressure value and the relative atmospheric pressure value of the vacuum tank;
and the vehicle control unit dynamically adjusts the opening and closing threshold of the vacuum pump according to the pressure model of the vacuum tank so as to meet the vacuum assistance of a preset area.
Optionally, the vehicle controller dynamically adjusts the opening and closing thresholds of the vacuum pump according to the vacuum tank pressure model so as to meet the vacuum assistance requirement of a preset area, and then the vehicle controller further includes:
the vehicle control unit determines a pressure value of a vacuum tank according to the brake switch signal and the running time of a vacuum boosting system;
the vehicle control unit collects an actual vacuum tank pressure value, and compares the vacuum tank pressure value with the actual vacuum tank pressure value to judge whether a vacuum tank pressure sensor fails or not;
and the vehicle control unit enters a fault mode when determining that the vacuum tank pressure sensor fails.
In addition, in order to achieve the above object, the present invention further provides an electric vehicle, which includes the electric vehicle vacuum pump redundancy control system as described above, or applies the electric vehicle vacuum pump redundancy control method as described above.
The invention provides a redundancy control system for a vacuum pump of an electric automobile, which comprises: the system comprises a vehicle control unit and a vacuum pump controller, wherein the vehicle control unit is in communication connection with the vacuum pump controller; the vehicle control unit is used for judging whether the vacuum pump controller fails or not according to an output instruction when the vehicle control unit receives the output instruction of the vacuum pump controller; the vehicle control unit is also used for acquiring a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generating a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal; and the vehicle control unit is also used for carrying out redundancy control on the vacuum pump according to the vacuum pump control signal. In the invention, under a normal condition, the vacuum pump control is executed by the vacuum pump controller, the vehicle control unit only carries out redundancy monitoring, and when the vehicle control unit detects the failure of the vacuum pump controller, the vehicle control unit intervenes to carry out redundancy control on the vacuum pump, so that the phenomenon that the driving feeling and the safety are influenced by the vacuum power failure caused by the failure of the vacuum pump controller is avoided, and the technical problem that the driving feeling and the safety are influenced by the vacuum power failure caused by the failure of software and hardware in the conventional vacuum pump control of the electric vehicle is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a redundant control system for a vacuum pump of an electric vehicle according to the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a redundant control system for a vacuum pump of an electric vehicle according to the present invention;
FIG. 3 is a schematic flow chart illustrating a method for controlling redundancy of a vacuum pump of an electric vehicle according to a first embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for controlling redundancy of a vacuum pump of an electric vehicle according to a second embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Vehicle control unit | K1 | First |
| 200 | Vacuum pump controller | K2 | Second |
| 101 | |
104 | |
| 102 | |
105 | |
| 103 | |
400 | Vacuum |
| 300 | Brake pedal |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a redundant control system for a vacuum pump of an electric automobile.
Referring to fig. 1, in an embodiment of the present invention, the electric vehicle vacuum pump redundancy control system includes: the system comprises a vehicle control unit 100 and a vacuum pump controller 200, wherein the vehicle control unit 100 is in communication connection with the vacuum pump controller 200; wherein the content of the first and second substances,
the vehicle control unit 100 is configured to, when receiving an output instruction of the vacuum pump controller 200, determine whether the vacuum pump controller 200 is disabled according to the output instruction. In this embodiment, the vehicle control unit 100 and the vacuum pump controller 200 jointly acquire the relative pressure signal of the vacuum tank and the brake switch signal, so as to realize the redundant control of the vacuum pump. Normally, the vacuum pump control is executed by the vacuum pump controller 200, and the vehicle control unit 100 performs only redundant monitoring. The vehicle control unit 100 is configured to, when receiving an output instruction of the vacuum pump controller 200, determine whether the vacuum pump controller 200 is disabled according to the output instruction: when the vehicle controller 100 detects that the vacuum pump controller 200 has an output command but does not actually output the command, it is determined that the software of the vacuum pump controller 200 is disabled, that is, the vacuum pump controller 200 has no CAN communication interaction and no control output, and at this time, the vehicle controller 100 intervenes in controlling the vacuum pump.
The vehicle control unit 100 is further configured to collect a vacuum tank relative pressure signal and a brake switch signal when the vacuum pump controller 200 fails, and generate a vacuum pump control signal according to the vacuum tank relative pressure signal and the brake switch signal. In this embodiment, when the vacuum pump controller 200 fails, the vehicle controller 100 intervenes in controlling the vacuum pump, and the vehicle controller 100 collects a vacuum tank relative pressure signal and a brake switch signal, and generates a vacuum pump control signal according to the vacuum tank relative pressure signal and the brake switch signal.
Specifically, the vehicle controller 100 may include a signal acquisition circuit, the electric vehicle may include a brake pedal and a vacuum tank pressure sensor, the brake pedal and the vacuum tank pressure sensor are respectively connected to the signal acquisition circuit of the vehicle controller 100, the vehicle controller 100 acquires a vacuum tank relative pressure signal of the vacuum tank pressure sensor through the signal acquisition circuit, and the vehicle controller 100 acquires a brake switch signal of the brake pedal through the signal acquisition circuit.
The vehicle control unit 100 is further configured to perform redundant control on the vacuum pump according to the vacuum pump control signal. In this embodiment, the vehicle control unit 100 performs redundancy control on the vacuum pump according to the vacuum pump control signal. When the vehicle control unit 100 detects that the vacuum pump controller 200 fails, the vehicle control unit 100 intervenes to perform redundant control on the vacuum pump, so that the influence of the failure of the vacuum power assistance on driving feeling and safety caused by the failure of the vacuum pump controller 200 is avoided. The system driving redundancy control is realized through the vehicle control unit 100 and the vacuum pump controller 200.
In this embodiment the electric automobile vacuum pump redundancy control system includes: the system comprises a vehicle control unit 100 and a vacuum pump controller 200, wherein the vehicle control unit 100 is in communication connection with the vacuum pump controller 200; the vehicle control unit 100 is configured to, when receiving an output instruction of the vacuum pump controller 200, determine whether the vacuum pump controller 200 fails according to the output instruction; the vehicle controller 100 is further configured to acquire a vacuum tank relative pressure signal and a brake switch signal when the vacuum pump controller 200 fails, and generate a vacuum pump control signal according to the vacuum tank relative pressure signal and the brake switch signal; the vehicle control unit 100 is further configured to perform redundant control on the vacuum pump according to the vacuum pump control signal. In the embodiment, under a normal condition, the vacuum pump control is executed by the vacuum pump controller, the vehicle control unit only carries out redundancy monitoring, when the vehicle control unit detects that the vacuum pump controller fails, the vehicle control unit intervenes to carry out redundancy control on the vacuum pump, the situation that the driving feeling and the safety are influenced due to vacuum power failure caused by the failure of the vacuum pump controller is avoided, and the technical problem that the driving feeling and the safety are influenced due to the vacuum power failure caused by the failure of software and hardware in the control of the existing electric vehicle vacuum pump is solved.
Further, referring to fig. 2, the vehicle control unit 100 includes an MCU circuit 101, a first driving circuit 102 and a second driving circuit 103, the MCU circuit 101 is connected to the first driving circuit 102 and the second driving circuit 103, the first driving circuit 102 is connected to a first vacuum pump relay K1, and the second driving circuit 103 is connected to a second vacuum pump relay K2; wherein the content of the first and second substances,
the MCU circuit 101 is further configured to control the first vacuum pump relay K1 through the first driving circuit 102 according to the vacuum pump control signal, so as to implement redundant control of a vacuum pump;
the MCU circuit 101 is also used for collecting the output end feedback voltage of the first vacuum pump relay K1 and judging whether the first vacuum pump relay K1 outputs normally or not according to the output end feedback voltage;
the MCU circuit 101 is further configured to control the second vacuum pump relay K2 through the second driving circuit 103 according to the vacuum pump control signal when detecting that the first vacuum pump relay K1 does not normally output, so as to implement redundant control of the vacuum pump.
It should be noted that the vehicle control unit 100 may include an MCU circuit 101, a first driving circuit 102, and a second driving circuit 103, and the vehicle control unit driving circuit redundancy control is implemented by the MCU circuit 101, the first driving circuit 102, and the second driving circuit 103. The vehicle controller 100 may further include a signal acquisition circuit 105, the signal acquisition circuit 105 is connected with the MCU circuit 101, the electric vehicle may include a brake pedal 300 and a vacuum tank pressure sensor 400, the brake pedal 300 and the vacuum tank pressure sensor 400 are respectively connected with the signal acquisition circuit 105, the vehicle controller 100 acquires a vacuum tank relative pressure signal of the vacuum tank pressure sensor 400 through the signal acquisition circuit 105, the vehicle controller 100 acquires a brake switch signal of the brake pedal 300 through the signal acquisition circuit, the signal acquisition circuit 105 transmits the vacuum tank relative pressure signal and the brake switch signal to the MCU circuit 101, and the MCU circuit 101 generates a vacuum pump control signal according to the vacuum tank relative pressure signal and the brake switch signal.
Specifically, the vehicle controller 100 is provided with a drive circuit dual backup redundancy, that is, the vehicle controller 100 includes a first drive circuit 102 and a second drive circuit 103, the drive circuits of the first vacuum pump relay K1 and the second vacuum pump relay K2 are two independent drive chips and circuits, that is, the first drive circuit 102 and the second drive circuit 103 are independent of each other, and one of the two circuits is digital high-side drive, and the other circuit is digital low-side drive. First vacuum pump relay K1 and second vacuum pump relay K2 belong to switching device, along with user's use, there is certain probability of failure, normal condition is when vehicle control unit 100 carries out the vacuum pump control, through first drive circuit 102, control first vacuum pump relay K1 and realize the control to the vacuum pump, adopt first vacuum pump relay K1's output feedback voltage simultaneously, whether be used for judging first vacuum pump relay K1 output normal, when detecting that first vacuum pump relay K1 is not normally exported, vehicle control unit 100 passes through second drive circuit 103, control second vacuum pump relay K2 carries out drive control. Meanwhile, if the system detects that the TBD (calibrated) relay output is abnormal, the system sends a related zone bit through the CAN, reports the zone bit to a background remote cloud server through a remote intelligent terminal, and actively prompts a user to replace a corresponding relay when maintaining or going to a 4S shop for maintenance.
Further, with continued reference to fig. 2, the vehicle control unit 100 includes an MCU circuit 101 and a comparison circuit 104, where the MCU circuit 101 is connected to the comparison circuit 104; wherein the content of the first and second substances,
the MCU circuit 101 is used for collecting a relative pressure signal and a brake switch signal of a vacuum tank and generating a vacuum pump control signal according to the relative pressure signal and the brake switch signal of the vacuum tank;
and the comparison circuit 104 is used for performing redundancy control on the vacuum pump according to the vacuum pump control signal when the MCU circuit 101 fails.
It should be noted that software and hardware redundancy control is implemented by the MCU circuit 101 and the comparison circuit 104. When the vehicle controller 100 controls the vacuum pump, the vehicle controller 100 collects a vacuum tank pressure signal (analog quantity signal), one path of the vacuum tank pressure signal is sent to the MCU circuit 101 and used for judging a software strategy of the MCU circuit 101, the other path of the vacuum tank pressure signal enters a comparison circuit (the circuit comparison circuit is enabled by default and is closed forcibly only when software detects and confirms that a vacuum tank pressure sensor fails), when the MCU circuit 101 in the vehicle controller 100 fails, the comparison circuit feeds back voltage through the pressure signal, and the comparison circuit and an amplification circuit realize the drive control of a second vacuum pump relay K2 according to a vacuum pump control signal, so that the redundant control of the vacuum pump is realized.
Further, the electric automobile vacuum pump redundancy control system still includes: a remote cloud server in communication connection with the vehicle control unit 100; wherein the content of the first and second substances,
the remote cloud server is used for acquiring vehicle GPS positioning information in real time and determining and outputting a remote atmospheric pressure value of the current vehicle position according to the vehicle GPS positioning information, the geographic position information and the season information;
the remote cloud server is further configured to report the remote atmospheric pressure value to the vehicle control unit 100 through CAN communication;
the vehicle control unit 100 is further configured to determine a relative atmospheric pressure value of the vacuum tank according to the relative pressure signal of the vacuum tank;
the vehicle control unit 100 is further configured to establish a vacuum tank pressure model according to the remote atmospheric pressure value and the relative atmospheric pressure value of the vacuum tank;
the vehicle control unit 100 is further configured to dynamically adjust a vacuum pump opening and closing threshold according to the vacuum tank pressure model so as to meet vacuum assistance in a preset area.
It is easy to understand that the electric vehicle vacuum pump redundancy control system may further include a remote cloud server, where the remote cloud server acquires vehicle GPS positioning information in real time, outputs an absolute atmospheric pressure value of the current vehicle position, that is, the remote atmospheric pressure value, by background positioning in combination with geographic position information and seasonal information, and reports the absolute atmospheric pressure value to the vehicle control unit 100 through a remote intelligent terminal via CAN communication. The vehicle control unit 100 establishes a vacuum tank pressure model by combining a remote atmospheric pressure value and a real-time acquired relative atmospheric pressure value of the vacuum tank, dynamically adjusts the opening and closing threshold value of the vacuum pump through the vacuum tank pressure model, and meets the braking assistance requirements in different atmospheric pressure environments of the plain and the plateau.
Specifically, the estimated vacuum tank pressure may be determined according to a user braking request (a braking switch and a braking pedal opening degree) and a vacuum boosting system operation time (including a vacuumizing time, a non-operation time and a vacuum boosting enabling time), wherein the user braking request may include the braking switch and the braking pedal opening degree, the vacuum boosting system operation time may include the vacuumizing time, the non-operation time and the vacuum boosting enabling time, the estimated vacuum tank pressure value is compared with an actual vacuum tank pressure value to diagnose whether the vacuum tank pressure sensor fails, and if the vacuum tank pressure sensor fails, the vehicle controller 100 enters a failure mode for controlling the vacuum pump, that is, the vacuum pump driving is turned on/off based on the estimated vacuum tank pressure value and the user braking request.
It should be noted that, in this embodiment, the redundant control system of the vacuum pump of the electric vehicle may be designed in a modular manner, the vehicle control unit 100 and the vacuum pump controller 200 are two sets of independent vacuum pump driving modules, and the vehicle control unit 100 and the vacuum pump controller 200 perform fault signal interaction through CAN communication, so as to meet a higher functional safety level. Based on cost optimization, three driving redundancy control modes are proposed for the embodiment: the system driving redundancy control is realized through the vehicle control unit 100 and the vacuum pump controller 200; the redundancy control of the driving circuit of the whole vehicle controller is realized through the MCU circuit 101, the first driving circuit 102 and the second driving circuit 103; software and hardware redundancy control is realized through the MCU circuit 101 and the comparison circuit 104, and two of them can be arbitrarily selected to be combined, which is not limited in this embodiment.
In addition, in order to achieve the above object, an embodiment of the present invention provides an electric vehicle vacuum pump redundancy control method, which is applied to the electric vehicle vacuum pump redundancy control system as described above, and the electric vehicle vacuum pump redundancy control system includes: referring to fig. 3, fig. 3 is a schematic flow chart of a vehicle control unit and a vacuum pump controller according to a first embodiment of a method for controlling redundancy of a vacuum pump of an electric vehicle according to the present invention.
In this embodiment, the electric vehicle vacuum pump redundancy control method includes the following steps:
step S10: and when the vehicle control unit receives an output instruction of the vacuum pump controller, judging whether the vacuum pump controller fails according to the output instruction.
It should be noted that the vehicle control unit and the vacuum pump controller jointly acquire a relative pressure signal of the vacuum tank and a brake switch signal, so as to realize redundant control of the vacuum pump. Under normal conditions, the vacuum pump control is executed by the vacuum pump controller, and the vehicle control unit only carries out redundancy monitoring. The vehicle control unit is used for judging whether the vacuum pump controller is invalid or not according to the output instruction when receiving the output instruction of the vacuum pump controller: when the vehicle control unit detects that the vacuum pump controller has an output instruction but does not actually output, determining that the software of the vacuum pump controller fails, namely the vacuum pump controller has no CAN communication interaction and no control output, and controlling the vacuum pump by the vehicle control unit.
Step S20: and the vehicle control unit collects a relative pressure signal of the vacuum tank and a brake switch signal when the vacuum pump controller fails, and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal.
It is easy to understand that when the vacuum pump controller fails, the vehicle control unit intervenes in controlling the vacuum pump, collects the relative pressure signal of the vacuum tank and the brake switch signal, and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal.
Specifically, the vehicle control unit can comprise a signal acquisition circuit, the electric vehicle can comprise a brake pedal and a vacuum tank pressure sensor, the brake pedal and the vacuum tank pressure sensor are respectively connected with the signal acquisition circuit of the vehicle control unit, the vehicle control unit acquires a vacuum tank relative pressure signal of the vacuum tank pressure sensor through the signal acquisition circuit, and the vehicle control unit acquires a brake switch signal of the brake pedal through the signal acquisition circuit.
Step S30: and the vehicle control unit performs redundancy control on the vacuum pump according to the control signal of the vacuum pump.
The vehicle control unit performs redundant control on the vacuum pump according to the vacuum pump control signal. When the vehicle control unit detects that the vacuum pump controller fails, the vehicle control unit intervenes to perform redundant control on the vacuum pump, and the influence on driving feeling and safety caused by the failure of the vacuum power assistance due to the failure of the vacuum pump controller is avoided. And the system driving redundancy control is realized through the vehicle control unit and the vacuum pump controller.
In this embodiment, when the vehicle control unit receives an output instruction of the vacuum pump controller, whether the vacuum pump controller fails or not is judged according to the output instruction; the vehicle control unit collects a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal; and the vehicle control unit performs redundancy control on the vacuum pump according to the control signal of the vacuum pump. In the embodiment, under a normal condition, the vacuum pump control is executed by the vacuum pump controller, the vehicle control unit only carries out redundancy monitoring, when the vehicle control unit detects that the vacuum pump controller fails, the vehicle control unit intervenes to carry out redundancy control on the vacuum pump, the situation that the driving feeling and the safety are influenced due to vacuum power failure caused by the failure of the vacuum pump controller is avoided, and the technical problem that the driving feeling and the safety are influenced due to the vacuum power failure caused by the failure of software and hardware in the control of the existing electric vehicle vacuum pump is solved.
Referring to fig. 4, fig. 4 is a schematic flowchart illustrating a method for controlling redundancy of a vacuum pump of an electric vehicle according to a second embodiment of the present invention. Based on the first embodiment, the vehicle control unit comprises an MCU circuit, a first driving circuit and a second driving circuit; in the step S30, the method for controlling the redundancy of the vacuum pump of the electric vehicle in this embodiment specifically includes:
s301: the MCU circuit controls the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal so as to realize redundant control of the vacuum pump.
The vehicle control unit may include an MCU circuit, a first driving circuit and a second driving circuit, and the driving circuit redundancy control of the vehicle control unit is implemented by the MCU circuit, the first driving circuit and the second driving circuit. The vehicle control unit can further comprise a signal acquisition circuit, the signal acquisition circuit is connected with the MCU circuit, the electric vehicle can comprise a brake pedal and a vacuum tank pressure sensor, the brake pedal and the vacuum tank pressure sensor are respectively connected with the signal acquisition circuit, the vehicle control unit acquires a vacuum tank relative pressure signal of the vacuum tank pressure sensor through the signal acquisition circuit, the vehicle control unit acquires a brake switch signal of the brake pedal through the signal acquisition circuit, the signal acquisition circuit sends the vacuum tank relative pressure signal and the brake switch signal to the MCU circuit, and the MCU circuit generates a vacuum pump control signal according to the vacuum tank relative pressure signal and the brake switch signal.
S302: the MCU circuit collects the output end feedback voltage of the first vacuum pump relay and judges whether the first vacuum pump relay outputs normally or not according to the output end feedback voltage.
It is easy to understand that the vehicle control unit is provided with the drive circuit dual-backup redundancy, that is, the vehicle control unit comprises a first drive circuit and a second drive circuit, the drive circuits of the first vacuum pump relay and the second vacuum pump relay are two independent drive chips and circuits, that is, the first drive circuit and the second drive circuit are mutually independent, one of the drive circuits is digital high-side drive, and the other drive circuit is digital low-side drive. First vacuum pump relay and second vacuum pump relay belong to switching device, and along with user's use, there is certain probability of failure, and when vehicle control unit carried out vacuum pump control under the normal condition, through a drive circuit, control first vacuum pump relay realized the control to the vacuum pump, and the output feedback voltage of the first vacuum pump relay of simultaneous back-sampling for judge whether first vacuum pump relay output is normal.
S303: and when the MCU circuit detects that the first vacuum pump relay does not normally output, the second vacuum pump relay is controlled through the second driving circuit according to the control signal of the vacuum pump so as to realize the redundant control of the vacuum pump.
It should be noted that, under normal conditions, when the vehicle control unit executes vacuum pump control, the first drive circuit is used for controlling the first vacuum pump relay to realize control over the vacuum pump, and meanwhile, the feedback voltage of the output end of the first vacuum pump relay is adopted for judging whether the output of the first vacuum pump relay is normal or not. Meanwhile, if the system detects that the TBD (calibrated) relay output is abnormal, the system sends a related zone bit through the CAN, reports the zone bit to a background remote cloud server through a remote intelligent terminal, and actively prompts a user to replace a corresponding relay when maintaining or going to a 4S shop for maintenance.
In this embodiment, the MCU circuit controls the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal, so as to implement redundant control of the vacuum pump; the MCU circuit collects the output end feedback voltage of the first vacuum pump relay and judges whether the first vacuum pump relay normally outputs or not according to the output end feedback voltage; and when the MCU circuit detects that the first vacuum pump relay does not normally output, the second vacuum pump relay is controlled through the second driving circuit according to the control signal of the vacuum pump so as to realize the redundant control of the vacuum pump. In the embodiment, under a normal condition, the vacuum pump control is executed by the vacuum pump controller, the vehicle control unit only carries out redundancy monitoring, when the vehicle control unit detects that the vacuum pump controller fails, the vehicle control unit intervenes to carry out redundancy control on the vacuum pump, the situation that the driving feeling and the safety are influenced due to vacuum power failure caused by the failure of the vacuum pump controller is avoided, and the technical problem that the driving feeling and the safety are influenced due to the vacuum power failure caused by the failure of software and hardware in the control of the existing electric vehicle vacuum pump is solved.
In order to achieve the above object, the present invention further provides an electric vehicle, which includes the electric vehicle vacuum pump redundancy control system as described above, or applies the electric vehicle vacuum pump redundancy control method as described above. The specific structure of the electric vehicle vacuum pump redundancy control system and the flow of the electric vehicle vacuum pump redundancy control method refer to the above embodiments, and since the electric vehicle adopts all the technical schemes of all the above embodiments, the electric vehicle at least has all the beneficial effects brought by the technical schemes of the above embodiments, and are not repeated herein.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the redundant control system of the vacuum pump of the electric vehicle provided by any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an electric automobile vacuum pump redundant control system which characterized in that, electric automobile vacuum pump redundant control system includes: the system comprises a vehicle control unit and a vacuum pump controller, wherein the vehicle control unit is in communication connection with the vacuum pump controller; wherein the content of the first and second substances,
the vehicle control unit is used for judging whether the vacuum pump controller fails or not according to the output instruction when receiving the output instruction of the vacuum pump controller;
the vehicle control unit is also used for acquiring a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generating a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the vehicle control unit is also used for carrying out redundancy control on the vacuum pump according to the vacuum pump control signal.
2. The electric vehicle vacuum pump redundancy control system of claim 1, wherein the vehicle control unit comprises an MCU circuit, a first driving circuit and a second driving circuit, the MCU circuit is connected to the first driving circuit and the second driving circuit respectively, the first driving circuit is connected to a first vacuum pump relay, and the second driving circuit is connected to a second vacuum pump relay; wherein the content of the first and second substances,
the MCU circuit is also used for controlling the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal so as to realize redundant control of the vacuum pump;
the MCU circuit is also used for collecting the output end feedback voltage of the first vacuum pump relay and judging whether the first vacuum pump relay normally outputs or not according to the output end feedback voltage;
and the MCU circuit is also used for controlling the second vacuum pump relay through the second driving circuit according to the control signal of the vacuum pump when the abnormal output of the first vacuum pump relay is detected so as to realize the redundant control of the vacuum pump.
3. The electric vehicle vacuum pump redundancy control system of claim 1, wherein the vehicle control unit comprises an MCU circuit and a comparison circuit, the MCU circuit is connected to the comparison circuit; wherein the content of the first and second substances,
the MCU circuit is used for acquiring a relative pressure signal of a vacuum tank and a brake switch signal and generating a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the comparison circuit is used for carrying out redundancy control on the vacuum pump according to the vacuum pump control signal when the MCU circuit fails.
4. The electric vehicle vacuum pump redundancy control system of claim 1, further comprising: the remote cloud server is in communication connection with the vehicle control unit; wherein the content of the first and second substances,
the remote cloud server is used for acquiring vehicle GPS positioning information in real time and determining and outputting a remote atmospheric pressure value of the current vehicle position according to the vehicle GPS positioning information, the geographic position information and the season information;
the remote cloud server is further used for reporting the remote atmospheric pressure value to the whole vehicle controller through CAN communication;
the vehicle control unit is further used for determining the relative atmospheric pressure value of the vacuum tank according to the relative pressure signal of the vacuum tank;
the vehicle control unit is also used for establishing a vacuum tank pressure model according to the remote atmospheric pressure value and the relative atmospheric pressure value of the vacuum tank;
and the vehicle control unit is further used for dynamically adjusting the opening and closing threshold values of the vacuum pump according to the vacuum tank pressure model so as to meet the vacuum assistance of a preset area.
5. The electric vehicle vacuum pump redundancy control method is applied to the electric vehicle vacuum pump redundancy control system according to any one of claims 1 to 4, and the electric vehicle vacuum pump redundancy control system comprises: the electric vehicle vacuum pump redundancy control method comprises the following steps:
when the vehicle control unit receives an output instruction of the vacuum pump controller, judging whether the vacuum pump controller fails according to the output instruction;
the vehicle control unit collects a relative pressure signal of a vacuum tank and a brake switch signal when the vacuum pump controller fails, and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the vehicle control unit performs redundancy control on the vacuum pump according to the control signal of the vacuum pump.
6. The electric vehicle vacuum pump redundancy control method of claim 5, wherein the vehicle control unit comprises an MCU circuit, a first driving circuit and a second driving circuit;
the step of the vehicle control unit performing redundancy control on the vacuum pump according to the vacuum pump control signal comprises the following steps:
the MCU circuit controls the first vacuum pump relay through the first driving circuit according to the vacuum pump control signal so as to realize redundant control of the vacuum pump;
the MCU circuit collects the output end feedback voltage of the first vacuum pump relay and judges whether the first vacuum pump relay normally outputs or not according to the output end feedback voltage;
and when the MCU circuit detects that the first vacuum pump relay does not normally output, the second vacuum pump relay is controlled through the second driving circuit according to the control signal of the vacuum pump so as to realize the redundant control of the vacuum pump.
7. The electric vehicle vacuum pump redundancy control method of claim 5, wherein the vehicle control unit comprises an MCU circuit and a comparison circuit,
the step of the vehicle control unit performing redundancy control on the vacuum pump according to the vacuum pump control signal comprises the following steps:
the MCU circuit collects a relative pressure signal of the vacuum tank and a brake switch signal and generates a vacuum pump control signal according to the relative pressure signal of the vacuum tank and the brake switch signal;
and the comparison circuit performs redundancy control on the vacuum pump according to the vacuum pump control signal when the MCU circuit fails.
8. The electric vehicle vacuum pump redundancy control method of claim 5, wherein the electric vehicle vacuum pump redundancy control system further comprises: a remote cloud server;
after the step of performing redundancy control on the vacuum pump according to the vacuum pump control signal, the vehicle control unit further comprises:
the remote cloud server acquires vehicle GPS positioning information in real time, and determines and outputs a remote atmospheric pressure value of the current vehicle position according to the vehicle GPS positioning information, the geographic position information and the season information;
the remote cloud server reports the remote atmospheric pressure value to the whole vehicle controller through CAN communication;
the vehicle control unit determines the relative atmospheric pressure value of the vacuum tank according to the relative pressure signal of the vacuum tank;
the vehicle control unit establishes a vacuum tank pressure model according to the remote atmospheric pressure value and the relative atmospheric pressure value of the vacuum tank;
and the vehicle control unit dynamically adjusts the opening and closing threshold of the vacuum pump according to the pressure model of the vacuum tank so as to meet the vacuum assistance of a preset area.
9. The method for controlling the redundancy of the vacuum pump of the electric vehicle as claimed in claim 8, wherein the vehicle controller dynamically adjusts the opening and closing thresholds of the vacuum pump according to the vacuum tank pressure model so as to satisfy the vacuum assistance in the preset area, and further comprises:
the vehicle control unit determines a pressure value of a vacuum tank according to the brake switch signal and the running time of a vacuum boosting system;
the vehicle control unit collects an actual vacuum tank pressure value, and compares the vacuum tank pressure value with the actual vacuum tank pressure value to judge whether a vacuum tank pressure sensor fails or not;
and the vehicle control unit enters a fault mode when determining that the vacuum tank pressure sensor fails.
10. An electric vehicle, characterized in that the electric vehicle comprises the electric vehicle vacuum pump redundancy control system according to any one of claims 1 to 4, or the electric vehicle vacuum pump redundancy control method according to any one of claims 5 to 9 is applied.
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