CN109782187A - 48V DC/DC control system and method based on road conditions detection - Google Patents
48V DC/DC control system and method based on road conditions detection Download PDFInfo
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- CN109782187A CN109782187A CN201910058160.4A CN201910058160A CN109782187A CN 109782187 A CN109782187 A CN 109782187A CN 201910058160 A CN201910058160 A CN 201910058160A CN 109782187 A CN109782187 A CN 109782187A
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Abstract
The present invention provides a kind of 48V DC/DC control methods based on road conditions detection, comprising: detects to the traveling road conditions of vehicle, generates corresponding traffic information；The two sides voltage of main relay contacts is detected, when the difference of testing result characterization two sides voltage is less than preset difference value, control main relay closure；Determined based on road condition of the traffic information to front of the car, the road condition includes that there are uphill way, flat section and descending sections in front of the car pre-determined distance；State status based on road condition judgement result and based on 48V battery SOC and 12V battery SOC, correspondingly controls DC/DC.The present invention also provides a kind of 48V DC/DC control systems based on road conditions detection.The present invention can sufficiently recycle braking energy under the road conditions such as mountain area long and steep downgrade, improve the efficiency of Energy Management System and reduce complete-vehicle oil consumption.
Description
Technical field
The present invention relates to technical field of new energy, and in particular to a kind of 48VDC/DC control system based on road conditions detection
System and method.
Background technique
With the publication of China's energy conservation and new-energy automobile Technology Roadmap, 48V system development has become China's energy conservation vapour
The development priority of vehicle.The 48V system of part vehicle enterprise P0 configuration has carried vehicle launch at present, realizes 10% or so oil
Consumption reduces.As what assembly electrification, next generation's 48V system configuration were researched and developed deepens continuously, 48V technology is with its high performance-price ratio, nothing
The advantage that high-voltage safety requires and maintenance is convenient will have bigger development space.
Therefore, how more efficiently to realize that the energy conservation and environmental protection of 48V system will become project urgently to be resolved.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of 48V DC/DC control system and method based on road conditions detection,
Even if vehicle driving in mountain area operating condition, can also complete Brake energy recovery to greatest extent and then reduce complete-vehicle oil consumption.
The technical solution adopted by the present invention are as follows:
The embodiment of the present invention provides a kind of 48V DC/DC control method based on road conditions detection, comprising:
The traveling road conditions of vehicle are detected, corresponding traffic information is generated；
The two sides voltage of main relay contacts is detected, is less than in the difference of testing result characterization two sides voltage default
When difference, control main relay closure；
Determined based on road condition of the traffic information to front of the car, the road condition includes that front of the car is default
There are uphill way, flat section and descending sections apart from interior；
State status based on road condition judgement result and based on 48V battery SOC and 12V battery SOC, to DC/DC
Correspondingly controlled.
Optionally, the shape of the SOC that result and SOC the and 12V battery based on 48V battery are determined based on road condition
State situation correspondingly controls DC/DC, is specifically included:
Determining that there are uphill ways or flat in result judgement front of the car pre-determined distance based on the road condition
When section, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission；
Determining and to work as in result judgement front of the car pre-determined distance there are when the section of downhill path based on the road condition
When the SOC of the 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, DC/DC is controlled
Carry out reverse transfer.
Optionally, during controlling DC/DC progress reverse transfer, when the SOC of the 12V battery is less than second threshold
When, control DC/DC carries out positive transmission, after the SOC of the 12V battery is greater than first threshold, restores control DC/DC and carries out
Reverse transfer.
Optionally, further includes:
When determining that vehicle enters descending section and is less than preset distance value away from bottom of slope based on the traffic information, and
When the SOC of the 48V battery is less than electric discharge cutoff threshold, control DC/DC carries out positive transmission.
Optionally, further includes:
When the difference of testing result characterization two sides voltage is greater than preset difference value, DC/DC reverse transfer is controlled, until two sides
The difference of voltage is less than the preset difference value.
Optionally, the electric discharge cutoff threshold is 30%；The charge cutoff threshold value is 95%；The first threshold is
90%；The second threshold is 80%.
Optionally, the pre-determined distance is 100m；The preset distance value is 10m.
Another embodiment of the present invention provides a kind of 48V DC/DC control systems based on road conditions detection, comprising:
Road conditions detection module, traveling road conditions used for vehicles are detected, and corresponding traffic information is generated；
Main relay control module is detected for the two sides voltage to main relay contacts, is characterized in testing result
When the difference of two sides voltage is less than preset difference value, control main relay closure；
Road conditions determination module, for being determined based on road condition of the traffic information to front of the car, the road conditions shape
State includes that there are uphill way, flat section and descending sections in front of the car pre-determined distance；
Control module, for the state based on road condition judgement result and based on 48V battery SOC and 12V battery SOC
Situation correspondingly controls DC/DC.
Optionally, the control module is specifically used for:
Determining that there are uphill ways or flat in result judgement front of the car pre-determined distance based on the road condition
When section, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission；
Determining and to work as in result judgement front of the car pre-determined distance there are when the section of downhill path based on the road condition
When the SOC of the 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, DC/DC is controlled
Carry out reverse transfer.
Optionally, the main relay control module is also used to:
When the difference of testing result characterization two sides voltage is greater than preset difference value, DC/DC reverse transfer is controlled, until two sides
The difference of voltage is less than the preset difference value.
48V DC/DC control system and method provided in an embodiment of the present invention based on road conditions detection, in traditional 48V system
Middle increase road condition detection system, the operation of DC/DC is controlled based on road conditions detection information, under the road conditions such as mountain area long and steep downgrade,
Braking energy can be sufficiently recycled, the efficiency of Energy Management System is improved and reduces complete-vehicle oil consumption.With adaptive learning algorithms
(ACC), the auxiliary such as self-actuating brake auxiliary system (AEB) drive function gradually popularize, the present invention can not additionally increase vehicle at
Under the premise of this, by sharing the components such as radar, camera with DAS (Driver Assistant System), the control of DC/DC is realized, it is economical and practical.
Detailed description of the invention
Fig. 1 is the hardware block diagram for the 48V DC/DC control system that the present invention uses；
Fig. 2 is the flow diagram of the 48V DC/DC control method of the invention based on road conditions detection；
Fig. 3 is the flow diagram of the 48V DC/DC control method based on road conditions detection of specific example of the invention；
Fig. 4 is the structural schematic diagram of the 48V DC/DC control system of the invention based on road conditions detection.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
Detailed description of the invention
Fig. 1 is the hardware block diagram for the 48V DC/DC control system that the present invention uses；Fig. 2 is of the invention based on road
The flow diagram of the 48V DC/DC control method of condition detection；Fig. 3 is being detected based on road conditions for specific example of the invention
The flow diagram of 48V DC/DC control method.
Firstly, being described in conjunction with Fig. 1 48V DC/DC control system used the present invention.As shown in Figure 1, of the invention
The 48V DC/DC control system used may include the road condition detection system being made of radar, camera, controller, BSG motor,
The 48V battery system being made of battery modules, BMS, main relay, 12V battery and battery sensor, the portions such as DC/DC and ECU
Part.
Wherein, radar is used to measure distance, camera is used to identify road conditions, and radar is cooperateed with camera completes environment sense
Know, wherein by radar obtain vehicle front smooth-riding surface distance, by camera confirm road surface ahead with the presence or absence of go up a slope or
Descending road conditions, and generate corresponding environment sensing data.The environment sensing data of generation are sent to controller, will be visited by controller
The environment sensing data measured are converted to quantifiable traffic information, including away from be at front of the car pre-determined distance it is flat or on
Descending etc..BSG motor is used to complete power generation (output 48V voltage), power-assisted and Brake energy recovery, 48V battery system be used to be
Motor power-assisted provides energy, absorbs power generation, energy regenerating or DC/DC and converts electric energy made of 12V system voltage, 12V battery is used
To power for 12V starter, each controller of 12V system, 12V battery sensor is used to monitor 12V cell voltage, electric current, SOC etc.
Parameter, DC/DC are used to realize the mutual transmitting of electric energy between 48V system and 12V system, and ECU is used to receive road condition detection system
Information simultaneously carries out COMPREHENSIVE CALCULATING according to states such as engine condition, 48V battery, the SOC of 12V battery, braking, throttles, controls BSG
The components such as motor, DC/DC, BMS execute corresponding actions.
Then, the 48V DC/DC control method of the invention detected based on road conditions is introduced in conjunction with Fig. 2 and Fig. 3, it should
Method is executed by control system above-mentioned.As shown in Fig. 2, the 48V DC/DC control method of the invention based on road conditions detection
The following steps are included:
S100, the traveling road conditions of vehicle are detected, generates corresponding traffic information.
S200, the two sides voltage of main relay contacts is detected, it is small in the difference of testing result characterization two sides voltage
When preset difference value, control main relay closure.
S300, determined based on road condition of the traffic information to front of the car, before the road condition includes vehicle
There are uphill way, flat section and descending sections in the pre-determined distance of end.
S400, result and the state status based on 48V battery SOC and 12V battery SOC are determined based on road condition, it is right
DC/DC is correspondingly controlled.
Wherein, in the step s 100, it can complete to detect by radar on vehicle and camera, and generate corresponding road
Condition information.
In step s 200, it after driver actuation, can be carried out by two sides voltage of the ECU to main relay contacts
Detection, when the difference of testing result characterization two sides voltage is less than preset difference value, control BMS is directly closed main relay.It is examining
When surveying the difference of result characterization two sides voltage greater than preset difference value, DC/DC reverse transfer is controlled, until the difference of two sides voltage is small
When the preset difference value, control BMS is closed main relay.In one example, preset difference value can be 5V.
In step S300, it can be determined by road condition of the controller above-mentioned to front of the car.Controller benefit
It can be obtained according to the data that radar and camera perceive with internal algorithm away from being flat or upper and lower at front of the car pre-determined distance
Slope, such as away from being flat section or slope section or descending section at front of the car 100m, and at descending section, vehicle
Distance etc. of the front end away from the gradient.
In step S400, it can be executed by controller above-mentioned, specifically be can comprise the following steps that
S401, being determined in result judgement front of the car pre-determined distance based on the road condition there are uphill way or
When flat section, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission.
In this step, if the controller determine that there are uphill ways or flat in front of the car pre-determined distance such as 100m
When section, can the SOC state to 48V battery detect, when the SOC of the 48V battery be greater than electric discharge cutoff threshold when, ECU
It controls DC/DC and carries out positive transmission, i.e., transmit the energy of 48V electrical network to 12V electrical network.Otherwise, ECU controls DC/
DC stops working.In this process, if main relay disconnects, ECU control DC/DC stops working.
In one example, electric discharge cutoff threshold can be 30%.
S402, based on the road condition determine result judgement front of the car pre-determined distance in there are downhill path section when,
And when the SOC of the 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, control
DC/DC carries out reverse transfer.
In this step, if the controller determine that in front of the car pre-determined distance such as 100m there are downhill path section when, can be right
The SOC state of 12V battery and 48V battery is detected, when the SOC of the 12V battery is greater than first threshold and 48V electricity
When the SOC in pond is less than charge cutoff threshold value, ECU controls DC/DC and carries out reverse transfer, i.e., by the energy of 12V electrical network to 48V
Electrical network transmission.During controlling DC/DC progress reverse transfer, when the SOC of the 12V battery is less than second threshold
When, ECU controls DC/DC and carries out positive transmission, after the SOC of the 12V battery is greater than first threshold, restores control DC/DC
Carry out reverse transfer.
In one example, the charge cutoff threshold value can be 95%；The first threshold can be 90%；The second threshold
It can be 80%.
S403, determining that vehicle enters descending section and away from bottom of slope less than preset distance value based on the traffic information
When, and when the SOC of the 48V battery is less than electric discharge cutoff threshold, control DC/DC carries out positive transmission.
In this step, if the controller determine that vehicle enters descending section and bottom of slope is less than preset distance value for example
When 10m, can the SOC state to 48V battery detect, when the 48V battery SOC be less than electric discharge cutoff threshold (such as 30%)
When, ECU controls DC/DC and carries out positive transmission.Otherwise, ECU controls DC/DC and stops working.
The specific example of 48V DC/DC control method based on road conditions detection of the invention can be as shown in Figure 3.
Based on the same inventive concept, the embodiment of the invention also provides a kind of 48V DC/DC controls based on road conditions detection
System, since the principle of the solved problem of the system is similar to preceding method, the implementation of the system may refer to aforementioned side
The implementation of method, overlaps will not be repeated.
Fig. 4 is the structural schematic diagram of the 48V DC/DC control system of the invention based on road conditions detection.As shown in figure 4, this
The 48V DC/DC control system based on road conditions detection that inventive embodiments provide, comprising:
Road conditions detection module 201, traveling road conditions used for vehicles are detected, and corresponding traffic information is generated；
Main relay control module 202 is detected for the two sides voltage to main relay contacts, in testing result table
When levying the difference of two sides voltage less than preset difference value, control main relay closure；
Road conditions determination module 203, for being determined based on road condition of the traffic information to front of the car, the road conditions
State includes that there are uphill way, flat section and descending sections in front of the car pre-determined distance；
Control module 204, for determining result based on road condition and based on 48V battery SOC and 12V battery SOC
State status correspondingly controls DC/DC.
Further, the control module 204 is specifically used for:
Determining that there are uphill ways or flat in result judgement front of the car pre-determined distance based on the road condition
When section, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission；
Determining and to work as in result judgement front of the car pre-determined distance there are when the section of downhill path based on the road condition
When the SOC of the 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, DC/DC is controlled
Carry out reverse transfer；And
When determining that vehicle enters descending section and is less than preset distance value away from bottom of slope based on the traffic information, and
When the SOC of the 48V battery is less than electric discharge cutoff threshold, control DC/DC carries out positive transmission.
Further, during controlling DC/DC progress reverse transfer, when the SOC of the 12V battery is less than the second threshold
When value, control DC/DC carries out positive transmission, after the SOC of the 12V battery is greater than first threshold, restore control DC/DC into
Row reverse transfer.
Further, the main relay control module 202 is also used to:
When the difference of testing result characterization two sides voltage is greater than preset difference value, DC/DC reverse transfer is controlled, until two sides
The difference of voltage is less than the preset difference value.
Further, the electric discharge cutoff threshold is 30%；The charge cutoff threshold value is 95%；The first threshold is
90%；The second threshold is 80%.
Further, the pre-determined distance is 100m；The preset distance value is 10m.
The function of above-mentioned each module can correspond to the respective handling step in process shown in Fig. 2 to 3, and details are not described herein.
Embodiment described above, only a specific embodiment of the invention, to illustrate technical solution of the present invention, rather than
It is limited, scope of protection of the present invention is not limited thereto, although having carried out with reference to the foregoing embodiments to the present invention detailed
Illustrate, those skilled in the art should understand that: anyone skilled in the art the invention discloses
In technical scope, it can still modify to technical solution documented by previous embodiment or variation can be readily occurred in, or
Person's equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make corresponding technical solution
Essence is detached from the spirit and scope of technical solution of the embodiment of the present invention, should be covered by the protection scope of the present invention.Therefore,
The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of 48V DC/DC control method based on road conditions detection characterized by comprising
The traveling road conditions of vehicle are detected, corresponding traffic information is generated；
The two sides voltage of main relay contacts is detected, is less than preset difference value in the difference of testing result characterization two sides voltage
When, control main relay closure；
Determined based on road condition of the traffic information to front of the car, the road condition includes front of the car pre-determined distance
Inside there is uphill way, flat section and descending section；
State status based on road condition judgement result and based on 48V battery SOC and 12V battery SOC, carries out DC/DC
Correspondingly control.
2. the 48V DC/DC control method according to claim 1 based on road conditions detection, which is characterized in that described to be based on
Road condition determines the state status of the SOC of result and SOC the and 12V battery based on 48V battery, carries out to DC/DC corresponding
Ground control, specifically includes:
Determining that there are uphill way or flat sections in result judgement front of the car pre-determined distance based on the road condition
When, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission；
Determine in result judgement front of the car pre-determined distance based on the road condition there are when the section of downhill path, and when described
When the SOC of 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, control DC/DC is carried out
Reverse transfer.
3. the 48V DC/DC control method according to claim 2 based on road conditions detection, which is characterized in that in control DC/
During DC carries out reverse transfer, when the SOC of the 12V battery is less than second threshold, control DC/DC carries out positive biography
It is defeated, after the SOC of the 12V battery is greater than first threshold, restores control DC/DC and carry out reverse transfer.
4. the 48V DC/DC control method according to claim 2 based on road conditions detection, which is characterized in that further include:
When determining that vehicle enters descending section and is less than preset distance value away from bottom of slope based on the traffic information, and work as institute
When stating the SOC of 48V battery less than electric discharge cutoff threshold, control DC/DC carries out positive transmission.
5. the 48V DC/DC control method according to claim 1 based on road conditions detection, which is characterized in that further include:
When the difference of testing result characterization two sides voltage is greater than preset difference value, DC/DC reverse transfer is controlled, until two sides voltage
Difference be less than the preset difference value.
6. the 48V DC/DC control method according to claim 3 based on road conditions detection, which is characterized in that the electric discharge
Cutoff threshold is 30%；The charge cutoff threshold value is 95%；The first threshold is 90%；The second threshold is 80%.
7. the 48V DC/DC control method according to claim 4 based on road conditions detection, which is characterized in that described default
Distance is 100m；The preset distance value is 10m.
8. a kind of 48V DC/DC control system based on road conditions detection characterized by comprising
Road conditions detection module, traveling road conditions used for vehicles are detected, and corresponding traffic information is generated；
Main relay control module is detected for the two sides voltage to main relay contacts, characterizes two sides in testing result
When the difference of voltage is less than preset difference value, control main relay closure；
Road conditions determination module, for being determined based on road condition of the traffic information to front of the car, the road condition packet
Include in front of the car pre-determined distance that there are uphill way, flat section and descending sections；
Control module, for the state feelings based on road condition judgement result and based on 48V battery SOC and 12V battery SOC
Condition correspondingly controls DC/DC.
9. the 48V DC/DC control system according to claim 1 based on road conditions detection, which is characterized in that the control
Module is specifically used for:
Determining that there are uphill way or flat sections in result judgement front of the car pre-determined distance based on the road condition
When, and when the SOC of the 48V battery is greater than electric discharge cutoff threshold, control DC/DC carries out positive transmission；
Determine in result judgement front of the car pre-determined distance based on the road condition there are when the section of downhill path, and when described
When the SOC of 12V battery is less than charge cutoff threshold value greater than the SOC of first threshold and the 48V battery, control DC/DC is carried out
Reverse transfer.
10. it is according to claim 8 based on road conditions detection 48V DC/DC control system, which is characterized in that the master after
Electrical control module is also used to:
When the difference of testing result characterization two sides voltage is greater than preset difference value, DC/DC reverse transfer is controlled, until two sides voltage
Difference be less than the preset difference value.
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| CN112389201A (en) * | 2020-10-30 | 2021-02-23 | 东风商用车有限公司 | Method and device for controlling balanced emergency power supply of double electrical systems of vehicle |
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Application publication date: 20190521 |
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| RJ01 | Rejection of invention patent application after publication |