CN107776412B - Braking resistance discharge control system and method - Google Patents
Braking resistance discharge control system and method Download PDFInfo
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- CN107776412B CN107776412B CN201710907118.6A CN201710907118A CN107776412B CN 107776412 B CN107776412 B CN 107776412B CN 201710907118 A CN201710907118 A CN 201710907118A CN 107776412 B CN107776412 B CN 107776412B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/22—Dynamic electric resistor braking, combined with dynamic electric regenerative braking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention discloses a braking resistance discharge control system and a method, wherein the system comprises a communication network, N discharge branches and N controllers which are in one-to-one correspondence with the N discharge branches, wherein N is an integer greater than or equal to 2; each bleeding branch comprises a brake resistor and a power tube which are connected in series, and each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch; the N controllers are communicated with the whole vehicle controller through the communication network to obtain a discharging instruction, and the discharging power corresponding to the discharging instruction is shared according to the number of the controllers in the system. The invention can realize that a plurality of controllers respond to the discharge power together, thus the peak power of the whole system is multiplied by the original power, and the invention can be suitable for more application occasions; and for a single controller, the controller can be operated in a single machine mode or in parallel, and the hardware and software of each controller are the same, so that the development cost is reduced.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a braking resistance discharge control system and a braking resistance discharge control method.
Background
The electric automobile often appears long distance downhill slope or the operating mode of emergency braking, and main drive controller can get into the electricity generation mode under this operating mode, turns into the electric energy repayment among the power battery with the kinetic energy of vehicle. In the power generation mode, in order to protect the power battery, a part of electric energy is discharged to the brake resistor. In a traditional electric quantity discharge method, the on-off of a resistor is controlled by a hardware circuit to discharge the electric quantity. In particular, the controller is also used for controlling the on-off of a power tube (such as an insulated gate bipolar transistor) on a discharge path of the brake circuit so as to control the discharge time and power of the brake resistor.
At present, hardware circuits are mostly adopted on electric automobiles to control the on-off of a brake resistor, namely the hardware circuits acquire the voltage on a bus. And if the voltage exceeds a certain threshold value, the brake resistor is switched on to discharge the electric quantity. When the voltage is lower than a certain threshold value, the brake resistor is disconnected to stop discharging. The on-off of the power tube is controlled by the brake resistor controller to control the bleeding time and power of the brake resistor. The former can not control the power discharged by the resistor, and different vehicle models need to be provided with different hardware circuits to adapt to different discharge conditions. In the latter case, the controller is used for controlling the power tube to output different duty ratios, so that the brake resistor can be controlled to discharge different powers. However, each device in the controller has a certain tolerance limit, and correspondingly, the brake resistor bleeding power also has a peak value. If the maximum discharge power required by the whole vehicle exceeds the peak power, a single controller cannot meet the requirement. Meanwhile, most controllers are made of die castings, and if the controllers of different models are manufactured, the die sinking needs to be carried out for many times, so that a large amount of cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a braking resistance discharge control system and method aiming at the defects that in the scheme of controlling a braking resistance by a hardware circuit in the prior art, the power discharged by the resistance cannot be controlled, different vehicle models need to be configured with different hardware circuits to adapt to different discharge conditions, and in the scheme of controlling a power tube by a controller to control different powers discharged by the braking resistance, each device in the controller has a certain tolerance limit, the power discharged by the braking resistance also has a peak value, and a single controller cannot meet the requirements.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a braking resistance discharge control system, which comprises a communication network, N discharge branches and N controllers in one-to-one correspondence with the N discharge branches, wherein N is an integer greater than or equal to 2; each bleeding branch comprises a brake resistor and a power tube which are connected in series, and each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch; and each controller in the N controllers is communicated with the whole vehicle controller through the communication network to obtain a discharging instruction, and the discharging power corresponding to the discharging instruction is shared according to the number of the controllers in the system.
In the brake resistance discharge control system according to the present invention, the communication network includes a first communication network and a second communication network, and the controller includes a discharge instruction receiving unit, a station number registration and state control unit, and a discharge instruction execution unit, wherein,
the discharging instruction receiving unit is used for receiving a discharging instruction sent by the vehicle control unit through the first communication network;
the station number registration and state control unit is used for registering the station number of the station number registration and state control unit in a second communication network based on a station number distribution rule when the power is on, and sending and receiving a state message in real time through the second communication network;
and the discharge instruction execution unit identifies the number of controllers in the whole communication network based on the state message, and controls the corresponding discharge branch circuit to share the discharge power corresponding to the discharge instruction according to the number of the controllers.
In the brake resistance discharge control system of the present invention, the station number allocation rule is:
each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
the numerical values of the station numbers of the N controllers are increased from the designated station number according to an increasing principle, wherein the designated station number is a preset numerical value;
and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number when the controller is powered off.
In the brake resistance discharge control system according to the present invention, the status message includes the following information: the station number, the registration state and the physical address of the local computer.
In the brake resistance discharge control system according to the present invention, each of the controllers includes an initialization subunit and a station number setting subunit, wherein,
the initialization subunit is used for initializing the local station number to the specified station number during power-on initialization, reading the physical address of the local machine and marking the registration state as unregistered;
the station number setting subunit is used for judging that only one controller is needed when the state message is not received within the preset power-on time, keeping the station number of the local machine at an initial value and marking the registration state as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is unregistered, firstly comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is greater than the physical address in the state message, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; then the registration state is marked as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is registered, firstly judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; the registration status is then marked as registered.
The invention also discloses a brake resistance discharge control method, which comprises the following steps:
n controllers which are in one-to-one correspondence with the N bleeding branches simultaneously receive a discharging instruction issued by the whole vehicle controller through a communication network;
each controller shares the discharge power corresponding to the discharge instruction according to the number of the controllers in the system;
each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch;
and N is an integer greater than or equal to 2, and each bleeding branch comprises a brake resistor and a power tube which are connected in series.
In the method for controlling the discharge of the brake resistor, the N controllers simultaneously receive a discharge instruction issued by the vehicle controller through a communication network, and the method includes the following steps:
and each controller receives a discharging instruction sent by the whole vehicle controller through the first communication network.
In the brake resistance discharge control method of the present invention, the method further includes:
each controller registers a station number in a second communication network based on a station number distribution rule when the controller is powered on, and sends and receives a state message in real time through the second communication network;
each controller shares the discharge power corresponding to the discharge command according to the number of controllers in the system, and the method specifically includes:
and each controller identifies the number of controllers in the whole communication network based on the state message, and controls the corresponding bleeding branch circuit to share the discharging power corresponding to the discharging instruction according to the number of the controllers.
In the brake resistance discharge control method of the present invention, the controller automatically registers its own station number in the second communication network according to the following station number allocation rule:
each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
the numerical values of the station numbers of the N controllers are increased from the designated station number according to an increasing principle, wherein the designated station number is a preset numerical value;
and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number when the controller is powered off.
In the brake resistance discharge control method of the present invention, registering the station number of the self includes:
when each controller is initialized in a power-on state, the station number of the controller is initialized to the designated station number, the physical address of the controller is read, and the registration state is marked as unregistered;
if the state message is not received within the preset time of power-on, judging that only one controller is available, keeping the station number of the local machine at an initial value, and marking the registration state as registered;
if the state message is received within the preset power-on time and the registration state in the state message is unregistered, firstly comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is larger than the physical address in the state message, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; then the registration state is marked as registered;
if the state message is received within the preset time of power-on and the registration state in the state message is registered, firstly judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; the registration status is then marked as registered.
The brake resistor discharge control system and method have the following beneficial effects: the invention can realize that a plurality of controllers respond to the discharge power together, thus the peak power of the whole system is multiplied by the original power, and the invention can be suitable for more application occasions; and for a single controller, the controller can be operated in a single machine mode or in parallel, and the hardware and software of each controller are the same, so that the development cost is reduced.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of a brake resistor discharge control system according to the present invention
FIG. 2 is a schematic structural diagram of one embodiment of a brake resistor discharge control system of the present invention;
FIG. 3 is a schematic diagram of the controller;
FIG. 4 is a schematic structural diagram of another embodiment of the brake resistor discharge control system of the present invention;
FIG. 5 is a flow chart of a brake resistor discharge control method of the present invention;
fig. 6 is a flowchart of the station number registration in one embodiment of the brake resistor discharge control method of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It is noted that the terms "equal," "same," "simultaneously," or other similar terms are not limited to the absolute equality or equality in mathematical terms, but may be similar in engineering sense or within an acceptable error range when practicing the claims of this patent. The term "coupled" or "connecting" is intended to encompass not only the direct connection of two entities, but also the indirect connection via other entities with beneficial and improved effects.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the present invention.
In order to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to the drawings and the specific embodiments in the specification, and it should be understood that the embodiments and the specific features in the embodiments of the present invention are detailed descriptions of the technical solution of the present application, and are not limited to the technical solution of the present application, and the technical features in the embodiments and the examples of the present invention may be combined with each other without conflict.
Referring to fig. 1, the general idea of the present invention is: a braking resistance discharge control system is constructed and comprises a communication network, N bleeding branches and N controllers, wherein a dashed box in the figure represents one bleeding branch, Vs represents a power supply to be bled, the N bleeding branches correspond to the N controllers one by one, and N is an integer greater than or equal to 2. Each bleeder branch comprises a brake resistor and a power tube which are connected in series, and each controller controls the discharge of the corresponding bleeder branch by controlling the on and off of the corresponding power tube; the N controllers communicate with a Vehicle Control Unit (VCU) through the communication network to obtain a discharge command, and share discharge power corresponding to the discharge command according to the number of controllers in the system.
Specifically, after receiving the discharge command, the controller controls the duty ratio of a PWM (Pulse Width Modulation) wave of the power tube according to the discharge power to be shared.
Referring to fig. 2, preferably, the communication network includes a first communication network and a second communication network. The first communication network is mainly responsible for communication between the VCU and the controller, and the second communication network is mainly responsible for communication between the controllers.
Referring to fig. 3, in detail, the controller includes a discharging instruction receiving unit, a station number registration and state control unit, and a discharging instruction executing unit, where:
and the discharging instruction receiving unit is used for receiving a discharging instruction sent by the whole vehicle controller through the first communication network.
And the station number registration and state control unit is used for registering the station number of the station number registration and state control unit in the second communication network based on the station number distribution rule when the power is on, and sending and receiving the state message in real time through the second communication network.
And the discharge instruction execution unit is used for identifying the number of controllers in the whole communication network based on the state message and controlling the corresponding discharge branch to share the discharge power corresponding to the discharge instruction according to the number of the controllers. For example, if there are N controllers, and the discharge power is P, each controller responds P/N.
Wherein the station number allocation rule comprises:
1) each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
2) the numerical values of the station numbers of the N controllers are increased from the designated station number according to an increasing principle, wherein the designated station number is a preset numerical value. For example, with only one controller, the station number is a designated station number, such as station number 1. When more than one controller is used, the numerical value of each station number is increased according to an increasing principle from the designated station number, such as 1, 2, 3 and the like;
3) and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number in case of power failure, for example, the station numbers 1, 2 and 3 are originally the same, if the 2 fails and is reduced, the station numbers 1 and 3 are still unchanged, the station number 2 is cleared, and if one controller is added, the station number is distributed as the station number 2.
The station number has two functions, the first is used for the above mentioned dynamic identification of the number of controllers, for example, the number of controllers can be counted according to the station number in all the received status messages; the second is that the feedback information (actual discharge power, voltage, current, fault information, etc.) of all controllers is uploaded to the VCU through the controller of the designated station number in a unified manner, specifically, the controllers of other stations except the designated station number send the feedback information to the controller of the designated station number through the second communication network, and the controller of the designated station number uploads the feedback information of the controller and the received feedback information of other controllers to the VCU through the first communication network.
It will be appreciated that the number of controllers may be configured according to actual needs. In general, peak powers of a single control unit of up to 70KW are already possible, theoretically two control units being sufficient in a commercial vehicle. In consideration of the control of the cost of the whole vehicle, a whole vehicle manufacturer can reasonably select a plurality of brake resistor controllers on the basis of the scheme of the invention, and the invention preferably selects two controllers.
Referring to fig. 4, the present invention will be described in detail below by taking 2 controllers as an example. As shown in fig. 4, the first and second communication networks are both CAN networks. Specifically, the two controllers and the VCU are connected in parallel through the same CAN bus CAN 1. Meanwhile, the two controllers are also connected with the other path of CAN bus CAN2 of the background to realize information interaction between the controllers, such as the receiving and sending of status messages. The state message comprises the following information: the station number, the registration state and the physical address of the local computer.
In order to ensure the identity of hardware and software of the controllers, the state of each controller before networking is the same, and the only difference is that each controller writes a unique physical address, namely a mac (media Access control) address, in an EEPROM (Electrically Erasable Programmable read only memory) before leaving the factory. After the controller is connected with the network, the controller CAN2 interacts information to confirm whether other controllers exist in the whole network: if yes, when the VCU sends a discharge instruction of discharge power, the two controllers receive the discharge instruction at the same time and respond to 50% of the discharge power at the same time, so that the power carrying capacity of the brake resistor in the whole network is 2 times of the original power carrying capacity; if not, it is regarded as a single machine state and responds to 100% of the discharge power.
With continuing reference to fig. 3, in particular, the station number registration and status control unit includes: state control subunit, initialization subunit and station number subunit, wherein:
the state control subunit is used for sending and receiving the state message in real time through the second communication network;
the initialization subunit is used for initializing the station number of the local computer to the specified station number, namely to the station number 1, reading the physical address of the local computer and marking the registration state as unregistered when the power-on initialization is carried out;
the station number setting subunit is used for judging that only one controller is needed when the state message is not received within the preset power-on time, keeping the station number of the local machine at an initial value, namely the station number 1, and marking the registration state as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is unregistered, firstly comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is greater than the physical address in the state message, automatically increasing 1 for the numerical value of the station number of the local machine, namely changing the numerical value into the station number 2, otherwise, keeping the initial value for the station number of the local machine, namely the station number 1; then the registration state is marked as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is registered, firstly judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing 1 for the numerical value of the station number of the local machine, namely changing the numerical value into the station number 2, otherwise, keeping the initial value for the station number of the local machine, namely the station number 1; the registration status is then marked as registered.
Based on the same inventive concept, the invention also discloses a brake resistance discharge control method, referring to fig. 5, the method comprises:
s501, N controllers which correspond to the N bleeding branches one by one simultaneously receive a discharging instruction issued by the whole vehicle controller through a communication network;
s502, each controller shares the discharge power corresponding to the discharge instruction according to the number of the controllers in the system;
the N is an integer greater than or equal to 2, and each bleeding branch comprises a brake resistor and a power tube which are connected in series;
and S503, each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch.
Preferably, the communication network includes a first communication network and a second communication network. The first communication network is mainly responsible for communication between the VCU and the controller, and the second communication network is mainly responsible for communication between the controllers.
The step S501 of simultaneously receiving the discharge instruction issued by the vehicle control unit through the communication network includes: and each controller receives a discharging instruction sent by the whole vehicle controller through the first communication network.
Preferably, the method further comprises; and each controller registers the station number in a second communication network based on the station number distribution rule when the controller is powered on, and sends and receives a state message in real time through the second communication network. The state message comprises the following information: the station number, the registration state and the physical address of the local computer.
Wherein, the step S502 of sharing, by each controller according to the number of controllers in the system, the discharge power corresponding to the discharge command specifically includes: and each controller dynamically identifies the number of controllers in the whole communication network based on the state message, and controls the corresponding bleeding branch circuit to share the discharging power corresponding to the discharging instruction according to the number of the controllers. For example, if there are N controllers, and the discharge power is P, each controller responds P/N.
Specifically, the controller automatically registers its own station number in the second communication network according to the following station number allocation rule:
1) each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
2) the numerical value of the station numbers of the N controllers increases from the designated station number according to an increasing principle. For example, with only one controller, the station number is a designated station number, such as station number 1. When more than one controller is used, the numerical value of each station number is increased according to an increasing principle from the designated station number, such as 1, 2, 3 and the like;
3) and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number in case of power failure, for example, the station numbers 1, 2 and 3 are originally the same, if the 2 fails and is reduced, the station numbers 1 and 3 are still unchanged, the station number 2 is cleared, and if one controller is added, the station number is distributed as the station number 2.
The station number has two functions, the first is used for dynamically identifying the number of the controllers, for example, the number of the controllers can be counted according to the station numbers in all the received status messages; the second is that the feedback information (actual discharge power, voltage, current, fault information, etc.) of all controllers is uploaded to the VCU through the controller of the designated station number in a unified manner, specifically, the controllers of other stations except the designated station number send the feedback information to the controller of the designated station number through the second communication network, and the controller of the designated station number uploads the feedback information of the controller and the received feedback information of other controllers to the VCU through the first communication network.
It will be appreciated that the number of controllers may be configured according to actual needs. In general, peak powers of a single control unit of up to 70KW are already possible, theoretically two control units being sufficient in a commercial vehicle. In consideration of the control of the cost of the whole vehicle, a whole vehicle manufacturer can reasonably select a plurality of brake resistor controllers on the basis of the scheme of the invention, and the invention preferably selects two controllers. Referring to fig. 6, the station number registration process will be described below by taking two controllers as an example.
Specifically, the registration of the station number of each controller includes:
s601, when each controller is initialized in a power-on state, initializing the station number of the controller to the designated station number, reading the physical address of the controller, and marking the registered state as unregistered;
s602, judging whether a state message is received within preset power-on time, if so, entering a step S603, otherwise, entering a step S606;
s603, judging whether the registration state in the state message is registered, if so, executing a step S604, otherwise, executing a step S605;
s604, judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing the numerical value of the station number of the local machine by 1, namely changing the numerical value into the station number 2, otherwise, keeping the initial value of the station number of the local machine, namely the station number 1, and executing the step S607;
s605, comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is greater than the physical address in the state message, automatically increasing the numerical value of the station number of the local machine by 1, namely changing the numerical value into the station number 2, otherwise, keeping the initial value of the station number of the local machine, namely the station number 1, and executing the step S607;
s606, judging that only one controller is provided, and the station number of the local machine keeps an initial value, namely the station number 1;
and S607, marking the registration state as registered.
In summary, the brake resistor discharge control system and method of the present invention have the following advantages: the invention can realize that a plurality of controllers respond to the discharge power together, thus the peak power of the whole system is multiplied by the original power, and the invention can be suitable for more application occasions; and for a single controller, the controller can be operated in a single machine mode or in parallel, and the hardware and software of each controller are the same, so that the development cost is reduced.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A braking resistance discharge control system is characterized by comprising a communication network, N bleeding branches and N controllers in one-to-one correspondence with the N bleeding branches, wherein N is an integer greater than or equal to 2; each bleeding branch comprises a brake resistor and a power tube which are connected in series, and each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch; and each controller in the N controllers is communicated with the whole vehicle controller through the communication network to obtain a discharging instruction, and the discharging power corresponding to the discharging instruction is shared according to the number of the controllers in the system.
2. The brake resistance discharge control system according to claim 1, wherein the communication network includes a first communication network and a second communication network, and the controller includes a discharge instruction receiving unit, a station number registration and state control unit, a discharge instruction execution unit, wherein,
the discharging instruction receiving unit is used for receiving a discharging instruction sent by the vehicle control unit through the first communication network;
the station number registration and state control unit is used for registering the station number of the station number registration and state control unit in a second communication network based on a station number distribution rule during power-on, and sending and receiving a state message in real time through the second communication network;
and the discharge instruction execution unit is used for identifying the number of controllers in the whole communication network based on the state message and controlling the corresponding bleeding branch to share the discharge power corresponding to the discharge instruction according to the number of the controllers.
3. The brake resistor discharge control system according to claim 2, wherein the station number allocation rule is:
each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
the numerical values of the station numbers of the N controllers are increased from the designated station number according to an increasing principle, wherein the designated station number is a preset numerical value;
and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number when the controller is powered off.
4. The brake resistor discharge control system of claim 2 wherein the status message includes the following information: the station number, the registration state and the physical address of the local computer.
5. The brake resistor discharge control system according to claim 4, wherein the station number registration and status control unit includes an initialization sub-unit and a station number setting sub-unit, wherein,
the initialization subunit is used for initializing the station number of the local computer to the specified station number during power-on initialization, reading the physical address of the local computer and marking the registration state as unregistered;
the station number setting subunit is used for judging that only one controller is needed when the state message is not received within the preset power-on time, keeping the station number of the local machine at an initial value and marking the registration state as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is unregistered, firstly comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is greater than the physical address in the state message, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; then the registration state is marked as registered;
the station number setting subunit is also used for receiving the state message within the preset power-on time, and when the registration state in the state message is registered, firstly judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; the registration status is then marked as registered.
6. A brake resistance discharge control method, characterized in that the method comprises:
n controllers which are in one-to-one correspondence with the N bleeding branches simultaneously receive a discharging instruction issued by the whole vehicle controller through a communication network;
each controller shares the discharge power corresponding to the discharge instruction according to the number of the controllers in the system;
each controller controls the discharge of the corresponding bleeding branch by controlling the on and off of the power tube in the corresponding bleeding branch;
and N is an integer greater than or equal to 2, and each bleeding branch comprises a brake resistor and a power tube which are connected in series.
7. The brake resistor discharge control method according to claim 6, wherein the N controllers simultaneously receive a discharge command issued by the vehicle controller through the communication network, and the method includes:
and each controller receives a discharging instruction sent by the whole vehicle controller through a first communication network.
8. The brake resistor discharge control method according to claim 7, characterized by further comprising:
each controller registers a station number in a second communication network based on a station number distribution rule when the controller is powered on, and sends and receives a state message in real time through the second communication network;
each controller shares the discharge power corresponding to the discharge command according to the number of controllers in the system, and the method specifically includes:
and each controller identifies the number of controllers in the whole communication network based on the state message, and controls the corresponding bleeding branch circuit to share the discharging power corresponding to the discharging instruction according to the number of the controllers.
9. The brake resistor discharge control method according to claim 8, wherein the controller automatically registers its own station number in the second communication network according to the following station number allocation rule:
each controller registers station numbers in preset time after power-on initialization, and stops station number registration after the preset time;
the numerical values of the station numbers of the N controllers are increased from the designated station number according to an increasing principle, wherein the designated station number is a preset numerical value;
and after each controller is electrified and registers the station number, keeping the station number unchanged, and automatically clearing the station number when the controller is powered off.
10. The brake resistor discharge control method according to claim 8, wherein registering the own station number includes:
when each controller is initialized in a power-on state, the station number of the controller is initialized to be the designated station number, the physical address of the controller is read, and the registration state is marked as unregistered;
if the state message is not received within the preset time of power-on, judging that only one controller is available, keeping the station number of the local machine at an initial value, and marking the registration state as registered;
if the state message is received within the preset power-on time and the registration state in the state message is unregistered, firstly comparing the physical address in the state message with the physical address of the local machine, if the physical address of the local machine is larger than the physical address in the state message, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; then the registration state is marked as registered;
if the state message is received within the preset time of power-on and the registration state in the state message is registered, firstly judging whether the station number in the state message is the same as the initialized station number of the local machine, if so, automatically increasing the numerical value of the station number of the local machine by 1, otherwise, keeping the initial value of the station number of the local machine; the registration status is then marked as registered.
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| SU851719A1 (en) * | 1979-10-04 | 1981-07-30 | Ленинградский Ордена Ленина Институтинженеров Железнодорожноготранспорта Им. Ak. B.H.Образцова | Multimotor electric drive |
| JP3357690B2 (en) * | 1992-09-07 | 2002-12-16 | 株式会社東芝 | Dynamic braking control device for linear motor driven electric vehicle. |
| KR100344984B1 (en) * | 1999-10-12 | 2002-07-19 | 엘지전자주식회사 | Braking method of washing machine |
| CN101423032B (en) * | 2008-11-28 | 2010-12-08 | 清华大学 | Electric automobile super capacitance management system |
| CN102170145B (en) * | 2010-02-27 | 2013-12-04 | 比亚迪股份有限公司 | A discharge balancing device for a battery pack and a working method of the device |
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