CN112046427A - Vehicle power supply system and power supply control method - Google Patents
Vehicle power supply system and power supply control method Download PDFInfo
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- CN112046427A CN112046427A CN202010953947.XA CN202010953947A CN112046427A CN 112046427 A CN112046427 A CN 112046427A CN 202010953947 A CN202010953947 A CN 202010953947A CN 112046427 A CN112046427 A CN 112046427A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 12
- 238000007599 discharging Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
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Abstract
The invention discloses a vehicle power supply system and a power supply control method. The method comprises the following steps: the power supply device comprises a first power supply module, a second power supply module, a control module and a power switch module; the second power supply module is externally connected with a load through the power switch module, the first power supply module is externally connected with the load, and the control module is respectively connected with the load and the power switch module; the first power supply module is used for supplying power to the load; the control module is used for detecting the condition that the first power supply module supplies power to the load; generating a switching signal based on the load power supply condition and sending the switching signal to a power switch module; the power switch module is used for determining the switch state of the power switch module based on the received switch signal; the second power supply module is used for supplying power to the load based on the switch state of the power switch module. According to the embodiment of the invention, the control module detects the condition that the power supply module supplies power to the load, and the switching signal is generated according to the power supply condition to control the state of the power supply switching module, so that the two power supply modules are independent from each other and do not influence each other, and the power supply requirement of automatic driving is met.
Description
Technical Field
The embodiment of the invention relates to the technical field of intelligent vehicles, in particular to a vehicle power supply system and a power supply control method.
Background
Along with the development of automobile intellectualization and electrification, the intelligence degree of a vehicle is higher and higher, automatic driving is gradually realized, the hands of a driver are liberated, meanwhile, stricter requirements are provided for the functional safety of the vehicle, and the higher functional safety requirements mean that an intelligent driving vehicle power supply system has the capacity of backup redundant power supply.
FIG. 1 is a prior art circuit configuration diagram of a parallel battery to provide redundant power; as shown in fig. 1, the direct parallel connection of the two storage batteries leads to the long-term mutual charging and discharging between the two storage batteries, the service life attenuation is accelerated, and the battery replacement cycle is directly shortened.
Fig. 2 is a circuit structure diagram of a dual Direct Current-Direct Current (DC-DC) converter used for providing a redundant power supply in the prior art, and as shown in fig. 2, two DC-DC converters for converting high voltage into low voltage include a high-power one as a main power supply output of a low-voltage system and a low-power one as a backup power supply output of an intelligent driving load and a safety-related load.
Fig. 3 is a circuit structure diagram of a prior art that adopts multiple switching devices to provide a redundant power supply, as shown in fig. 3, a switch S1 is normally closed, a switch S2 is normally open, when a main power supply loop goes wrong, S1 is open, and S2 is closed, but two batteries are not really isolated, so that the problem of mutual charging and discharging still exists when the storage battery 2 is recharged, and the service life of the storage battery is shortened.
Disclosure of Invention
The invention provides a vehicle power supply system and a power supply control method, which are used for realizing mutual independence and mutual noninterference of two power supply modules and meeting the power supply requirement of automatic driving.
In a first aspect, an embodiment of the present invention provides a vehicle power supply system, including: the power supply device comprises a first power supply module, a second power supply module, a control module and a power switch module; the second power supply module is externally connected with a load through the power switch module, the first power supply module is externally connected with the load, and the control module is respectively connected with the load and the power switch module;
the first power supply module is used for supplying power to the load;
the control module is used for detecting the condition that the first power supply module supplies power to the load; generating a switching signal based on the load power supply condition and sending the switching signal to the power switch module;
the power switch module is used for determining the switch state of the power switch module based on the received switch signal;
and the second power supply module is used for supplying power to the load based on the switching state of the power switch module.
In a second aspect, an embodiment of the present invention further provides a power supply control method, including:
detecting the condition that the first power supply module supplies power to the load through the control module;
generating a switching signal based on the load power supply condition through a control module and sending the switching signal to a power switch module;
determining, by the power switch module, a switch state of the power switch module based on the received switch signal;
and supplying power to the load through a second power supply module based on the on-off state of the power switch module.
The vehicle power supply system of the present invention includes: the power supply device comprises a first power supply module, a second power supply module, a control module and a power switch module. The external load of first power module supplies power for the load, and the external load of second power module through switch module, control module respectively with the load with switch module connects. The control module is used for detecting the power supply condition of the first power supply module as a load, generating a switching signal according to the power supply condition and sending the switching signal to the power switch module, and determining the switching state of the power switch module. The second power supply module supplies power to the load based on the on-off state of the power switch module. The problem of among the prior art between two power supply module mutual charge-discharge and then produce life-span decay etc is solved, realize two power supply module mutual independence, each other does not influence, can satisfy autopilot's power supply demand.
Drawings
FIG. 1 is a circuit diagram of a prior art battery in parallel to provide redundant power;
FIG. 2 is a diagram of a prior art circuit for providing redundant power using dual DC-DC converters according to the present invention;
FIG. 3 is a diagram of a prior art circuit for providing redundant power using multiple switching devices;
fig. 4 is a schematic structural diagram of a vehicle power supply system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle power supply system according to a second embodiment of the present invention;
fig. 6 is a flowchart of a power supply control method according to a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a vehicle power supply system according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 4 is a schematic structural diagram of a vehicle power supply system according to an embodiment of the present invention, which is applicable to a situation of intelligent vehicle power supply.
As shown in fig. 4, a vehicle power supply system according to a first embodiment of the present invention includes: the power supply system comprises a first power supply module 11, a second power supply module 12, a control module 13 and a power switch module 14; the second power supply module 12 is externally connected with a load 15 through a power switch module 14, the first power supply module 11 is externally connected with the load 15, and the control module 13 is respectively connected with the load 15 and the power switch module 14.
The first power supply module 11 is used for supplying power to a load 15.
The control module 13 is used for detecting the condition that the first power supply module 11 supplies power to the load 15; and generating a switching signal based on the power supply condition of the load 15 and sending the switching signal to the power switch module 14.
And the power switch module 14 is used for determining the switch state of the power switch module 14 based on the received switch signal.
And a second power supply module 12 for supplying power to the load 15 based on the switching state of the power switch module 14.
In the present embodiment, the first power supply module 11 refers to an energy storage device for supplying electric energy to the vehicle related system. The second power supply module 12 is a standby energy storage device for guaranteeing the safety requirement of the intelligent driving vehicle power supply system.
Wherein, the first power supply module 11 includes: storage batteries, supercapacitors or lithium batteries; the second power supply module 12 includes: a battery, a super capacitor or a lithium battery. The service life of the super capacitor is longer, the charging and discharging power can be larger, but the stored energy is less, whether the capacity of the super capacitor meets the requirement or not needs to be calculated according to the driving requirement of an emergency, and the cost is increased if the capacity needs to be increased. The energy storage and the life-span of lithium cell are all better, but need increase BMS and manage, and control is more complicated, and the cost is also on the high side. In this embodiment, the first power supply module is a battery based on cost considerations.
Wherein the load 15 includes: comfort load, safety related load and intelligent driving load. When the vehicle power supply system is normal, the first power supply module 11 supplies power for a comfortable load, a safety related load and an intelligent driving load; when the first power supply module 11 of the vehicle is in fault or the circuit between the first power supply module and the load is abnormal, the second power supply module 12 supplies power for the safety-related load and the intelligent driving load.
The control module 13 detects that the first power supply module 11 supplies power to the load 15, and when the control module 13 detects that the first power supply module 11 supplies power to the load 15 normally, the control module 13 generates a switch off signal and sends the switch off signal to the power switch module 14. The power switch module 14 determines that the power switch module 14 is in the off state based on receiving the switch off signal, the first power supply module 11 supplies power to the load 15, and the second power supply module 12 does not participate in the power supply.
In another embodiment, the power switch module 14 is in a normally off state. Specifically, the vehicle power supply system works normally, and when the first power supply module supplies power to the load 15 normally, the power switch module 14 is in the off state, and it is not necessary to send a switching signal to the power switch module 14 to change the off state.
The power switching module 14 in this embodiment may include a DC-DC converter and a switching device. The DC-DC converter is used to convert high-voltage DC power to low-voltage DC power, or the DC-DC converter is used to convert low-voltage DC power to high-voltage DC power. The DC-DC-DC converter in this embodiment is configured to convert a first DC power into a second DC power, where the first DC power is provided by the first power supply module or the power source. The second direct current is the direct current required by the second power supply module.
Further, the DC-DC converter in this embodiment is a unidirectional output, which means that only the first power supply module 11 outputs and charges the second power supply module 12 through the DC-DC converter, and the second power supply module 12 does not output and charge the first power supply module 11 through the DC-DC converter. Thus, circuit isolation and battery charge and discharge functions can be provided. The switch off signal generated by the control module 13 indicates that the power switch module 14 is in an off state, and is not limited to the on-off state of a specific device, and different devices are different in the on-off state according to the working principle.
When the control module 13 detects that the first power supply module 11 supplies power to the load 15 abnormally, the control module 13 generates a switch closing signal and sends the switch closing signal to the power switch module 14. The power switch module 14 determines that the power switch module 14 is in the closed state based on receiving the switch close signal, and the second power module 12 supplies power to the load 15. The power supply abnormality includes an internal fault of the first power supply module 11, an electric quantity of the first power supply module 11 is insufficient, and a line between the first power supply module 11 and the load 15 is disconnected.
In the vehicle power supply system, the control module detects the power supply condition of the power supply module as the load, and generates a switching signal to be sent to the power switch module according to the power supply condition of the power supply module as the load, so as to determine the switching state of the power switch module. The problem of among the prior art between two power supply module mutual charge-discharge and then produce life-span decay etc is solved, realize two power supply module mutual independence, each other does not influence, can satisfy autopilot's power supply demand.
Example two
On the basis of the above embodiments, the present embodiment further optimizes the above vehicle power supply system.
Fig. 5 is a schematic structural diagram of a vehicle power supply system according to a second embodiment of the present invention. As shown in fig. 5, the power switch module 14 of the vehicle power supply system in the embodiment includes a first switch 141, and the second power supply module 12 is externally connected to the load 15 through the first switch 141 in the power switch module 14.
The control module 13 is specifically configured to generate a close switch signal and send the close switch signal to the power switch module 14 when the first power supply module 11 fails to normally supply power to the load 15.
The power switch module 14 is specifically configured to determine that the first switch 141 is closed based on the closing switch signal.
And the second power supply module 12 is used for being connected with the load 15 through the first switch 141 with the closed switch to supply power to the load 15.
Wherein, first switch 141 can select MOS pipe or relay according to actual demand, and the response time of MOS pipe is better, more is fit for frequently moving, and the relay then more is fit for the low-cost scheme of heavy current.
Specifically, when the control module 13 detects that the first power supply module 11 supplies power to the load 15 normally, the control module 13 generates a switch off signal and sends the switch off signal to the power switch module 14. The power switch module 14 determines that the first switch 141 of the power switch module 14 is turned off based on the received switch off signal, the first power supply module 11 supplies power to the load 15, and the second power supply module 12 does not participate in power supply.
When the control module 13 detects that the first power supply module 11 supplies power to the load 15 abnormally, the control module 13 generates a switch closing signal and sends the switch closing signal to the power switch module 14. The power switch module 14 determines that the first switch 141 of the power switch module 14 is closed based on the received switch closing signal, and the second power supply module 12 supplies power to the load 15 through the closed first switch 141.
Further, the vehicle power supply system in this embodiment further includes: a power supply 16 and a protection module 17.
The power supply 16 is connected with the first power supply module 11 through the protection module 17, and the power supply 16 is connected with the second power supply module 12 after passing through the protection module 17 and the power switch module 14.
The power supply 16 is configured to charge the first power supply module 11 after the power supply 16 is started.
It should be noted that the power supply 16 may be a power supply provided by a generator, and the power supply 16 of the new energy vehicle converts a high voltage into a low voltage for a power battery through a DC-DC converter. The protection module 17 may be composed of a plurality of fuses.
In the case where the vehicle power supply system is normal, the power source 16 charges the first power supply module 11 through the protection module 17 after its own start. When the second power supply module 12 is detected to be low in power, the power supply 16 charges the second power supply module 12 after passing through the protection module 17 and the power switch module 14.
Further, the vehicle power supply system in this embodiment further includes: the first charge sensor 18 and the second charge sensor 19, and the power switch module 14 includes a DC-DC converter 142.
The first electric quantity sensor 18 is connected with the first power supply module 11, the second electric quantity sensor 19 is connected with the second power supply module 12, and the first electric quantity sensor 18 and the second electric quantity sensor 19 are respectively connected with the control module 13.
The first electric quantity sensor 18 is used for measuring the first electric quantity of the first power supply module 11 and sending the first electric quantity to the control module 13;
the second electric quantity sensor 19 is used for measuring the second electric quantity of the second power supply module 12 and sending the second electric quantity to the control module 13;
the control module 13 is further configured to determine a state 142 of the DC-DC converter based on a relationship between the first electrical quantity and the second electrical quantity.
It should be noted that the power switch module 14 includes a first switch 141 and a DC-DC converter 142. The first switch 141 has one end connected to the second module 12 and the DC-DC converter 142, and the other end connected to the load 15. The DC-DC converter 142 has one end connected to the first power supply module 11 through the protection module 17, and the other end connected to the second power supply module 12 and the first switch 141, respectively. The DC-DC converter 142 is a unidirectional output, and when the DC-DC converter 142 is in an output state, the first power supply module 11 can charge the second module 12.
Specifically, in a normal operating state of the vehicle power supply system, before the power supply 16 is started, the first electric quantity sensor 18 measures the first electric quantity of the first power supply module 11, and the second electric quantity sensor 19 measures the second electric quantity of the second power supply module 12, and sends the measurement result to the controller 13. When the first power is normal, the control module 13 controls the first switch 141 in the power switch module 14 to be turned off, and the DC-DC converter 142 turns off the output. After the power supply 16 is normally started, the first power supply module 11 is charged through the protection module 17.
Optionally, after the power supply 16 is normally started, if the second electric quantity sensor 19 measures that the second electric quantity of the second power supply module 12 is smaller than the second threshold, the first switch 141 is turned off, the DC-DC converter 142 turns on the output, and the power supply 16 charges the second power supply module 12 through the protection module 17 and the power switch module 14. When the second electric quantity is detected to be greater than the third threshold value during the process of charging the second power supply module 12 by the power source 16, the DC-DC converter 142 turns off the output, and stops charging the second power supply module 12.
Optionally, in a normal operating state of the vehicle power supply system, before the power supply 16 is started, when the first power amount is higher than the first threshold and the second power amount is lower than the second threshold, the control module 13 controls the first switch 141 in the power switch module 14 to be turned off, the DC-DC converter 142 starts outputting, and the first power supply module 11 charges the second power supply module 12 through the protection module 17 and the DC-DC converter 142. In the process that the first power supply module 11 charges the second power supply module 12, when it is detected that the second power amount is greater than the third threshold or the first power amount is smaller than the fourth threshold, the control module 13 controls the first switch 141 in the power switch module 14 to be turned off, the DC-DC converter 142 turns off the output, and the first power supply module 11 stops charging the second power supply module 12.
Alternatively, when the control module 13 detects that the power supply 16 fails, the control module 13 controls the first switch 141 to be closed, the DC-DC converter 142 to turn on the output, and the first power supply module 11 and the second power supply module 12 simultaneously supply power to the load 15.
The DC-DC converter 142 realizes isolation between the first power supply module 11 and the second power supply module 12, and prevents them from charging and discharging each other. When the system normally works, the second power supply module 12 does not participate in power supply, and meanwhile, the system can always ensure that the second power supply module 12 is in a relatively healthy electric quantity state, so that the service life of the second power supply module 12 is further ensured, and the maintenance of the second power supply module 12 in the life cycle of the whole vehicle is reduced.
The vehicle power supply system provided by the second embodiment of the invention is specifically described on the basis of the above embodiments, and specifically describes the connection relationship and functions of the power switch module, the power supply, the protection module, the first electric quantity sensor and the second electric quantity sensor. The electric quantity condition of the power supply module is detected in real time through the first electric quantity sensor and the second electric quantity sensor, and the closing state of the power switch module is controlled according to the electric quantity of the power supply module, so that the charging and discharging of the two modules under different conditions are controlled. The mutual independence and mutual noninterference of the two power supply modules are realized.
On the basis of the foregoing embodiment, the control module 13 is further specifically configured to control the DC-DC converter 142 to start up and the first power supply module 11 to charge the second power supply module 12 when the first electric quantity is greater than a first threshold and the second electric quantity is less than a second threshold before the power supply 16 is started, where the first threshold is greater than or equal to the second threshold.
The control module 13 is further specifically configured to control the DC-DC converter 142 to turn off when the second electric quantity is greater than the third threshold or the first electric quantity is less than the fourth threshold in a process that the first power supply module 11 charges the second power supply module 12, and the first power supply module 11 stops charging the second power supply module 12.
The control module 13 is further configured to control the DC-DC converter to be turned off and the first switch 141 to be turned on when the power source 16 fails, so that the first power supply module 11 and the second power supply module 12 simultaneously supply power to the load 15.
The control module 13 is further configured to, after detecting that the power supply 16 is started, control the DC-DC converter 142 to turn on and control the first switch 141 to turn off when the second electric quantity is smaller than the second threshold, where the power supply 16 charges the second power supply module 12.
EXAMPLE III
Fig. 6 is a flowchart of a power supply control method provided in a third embodiment of the present invention, where the method is executed by the vehicle power supply system provided in the above embodiment, and includes:
and S110, detecting the condition that the first power supply module supplies power to the load through the control module.
And S120, generating a switching signal based on the load power supply condition through the control module, and sending the switching signal to the power switch module.
S130, determining the switch state of the power switch module through the power switch module based on the received switch signal.
And S140, supplying power to the load through a second power supply module based on the switching state of the power switch module.
The power switch module comprises a first switch, and the second power supply module is externally connected with a load through the first switch in the power switch module.
When the first power supply module fails to normally supply power to the load, the control module generates a closing switch signal and sends the closing switch signal to the power switch module.
Determining, by the power switching module, that the first switch is closed based on the close switch signal.
And the second power supply module is connected with the load based on the first switch closed by the switch to supply power to the load.
Further, the system further comprises: power supply and protection module.
The power supply is connected with the first power supply module through the protection module, and the power supply is connected with the second power supply module after passing through the protection module and the power switch module.
And the power supply is used for charging the first power supply module after the power supply is started.
Further, the system further comprises: the power switch module comprises a direct current-direct current DC-DC converter.
The first electric quantity sensor is connected with the first power supply module, the second electric quantity sensor is connected with the second power supply module, and the first electric quantity sensor and the second electric quantity sensor are respectively connected with the control module.
And measuring the first electric quantity of the first power supply module through the first electric quantity sensor, and sending the first electric quantity to the control module.
And measuring the second electric quantity of the second power supply module through the second electric quantity sensor, and sending the second electric quantity to the control module.
Determining, by a control module, a state of a DC-DC converter based on a relationship of the first electrical quantity and the second electrical quantity.
Further, before the power supply is started, the control module controls the DC-DC converter to be turned on when the first electric quantity is greater than a first threshold and the second electric quantity is less than a second threshold, and the first power supply module charges the second power supply module, wherein the first threshold is greater than or equal to the second threshold.
Further, when the first power supply module charges the second power supply module, the control module controls the DC-DC converter to be turned off when the second electric quantity is greater than a third threshold value or the first electric quantity is less than a fourth threshold value, and the first power supply module stops charging the second power supply module.
Further, when the power supply fails, the control module controls the DC-DC converter to be turned off and controls the first switch to be turned on, so that the first power supply module and the second power supply module simultaneously supply power to the load.
Further, the control module controls the DC-DC converter to be started and controls the first switch to be switched off based on the fact that the control module detects that the power supply is started and the second electric quantity is smaller than a second threshold value, and the power supply charges the second power supply module.
Further, the first power supply module includes: storage batteries, supercapacitors or lithium batteries; the second power supply module includes: a battery, a super capacitor or a lithium battery.
In this embodiment, the control module detects a power supply condition of the first power supply module as a load, generates a switching signal according to the power supply condition, and sends the switching signal to the power switch module to determine the switching state of the power switch module. The second power supply module supplies power to the load based on the on-off state of the power switch module. The problem of among the prior art between two power supply module mutual charge-discharge and then produce life-span decay etc is solved, realize two power supply module mutual independence, each other does not influence, can satisfy autopilot's power supply demand.
Example four
Fig. 7 is a schematic structural diagram of a vehicle power supply system according to a fourth embodiment of the present invention, and details of a method in the present embodiment are described with reference to fig. 7. Specifically, the power supply control method includes the following conditions:
1. in a normal working state of the system, before the power supply 16 is started, the control module 13 can detect the electric quantities of the first power supply module 11 and the second power supply module 12 in real time through the first electric quantity sensor 18 and the second electric quantity sensor 19, and when the first electric quantity of the first power supply module 11 is normal, the DC-DC converter 142 is turned off to output, and the first switch 141 is turned off.
2. In a normal working state of the system, after the power supply 16 is started, the power supply 16 supplies power to all loads 15 of the entire vehicle and charges the first power supply module 11 to ensure the electric quantity of the first power supply module 11, the DC-DC converter 142 turns off the output, and the first switch 141 is turned off.
3. In a normal working state of the system, before the power supply 16 is started, when the first electric quantity sensor 18 detects that the first electric quantity of the first power supply module 11 is greater than the first threshold value, and the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is less than the second threshold value, the DC-DC converter 142 starts outputting, the first power supply module 11 charges the second power supply module 12, and the first switch 141 is turned off.
4. In a normal working state of the system, before the power supply 16 is started, when the first power supply module 11 charges the second power supply module 12, and the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is greater than the third threshold, or the first electric quantity sensor 18 detects that the first electric quantity of the first power supply module 11 is less than the fourth threshold, the DC-DC converter 142 turns off the output, stops charging, and the first switch 141 is turned off.
5. In a normal working state of the system, after the power supply 16 is started, when the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is smaller than the second threshold value, the power supply 16 charges the second power supply module 12, and the DC-DC converter 142 starts to output.
6. In a normal working state of the system, after the power supply 16 is started, and in a charging process of the second power supply module 12 after the power supply 16 is started, when the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is greater than the third threshold value, the DC-DC converter 142 turns off output, stops charging, and the first switch 141 is turned off.
7. When the power supply 16 fails or the fuse 1 is fused, the direct current-direct current DC-DC converter 142 turns off the output, the first switch 141 is closed, and the two power supply modules simultaneously supply power to the safety-related load 152 and the intelligent driving load 153, so that the operable time of intelligent driving is ensured to the greatest extent.
8. When the main power supply line fails or the fuse 3 is fused due to short circuit of the comfortable load 151 and the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is greater than the third threshold value, the DC-DC converter 142 turns off the output, the first switch 141 is turned on, and only the second power supply module 12 supplies power to the safety-related load 152 and the intelligent driving load 153, so as to ensure the driving safety in emergency.
9. When the main power supply line fails due to a fault or the fuse 3 is fused due to a short circuit of the comfortable load 151, and the second electric quantity sensor 19 detects that the second electric quantity of the second power supply module 12 is smaller than a second threshold value, (the electric quantity of the second power supply module 12 can be always ensured under normal driving conditions, and such a situation can not occur, generally, only a vehicle parked for a long time, and failure occurs just after driving is resumed), the direct current-direct current DC-DC converter 142 starts to output, the first switch 141 is closed, the power supply 16 provides power for the safety-related load 152 and the intelligent driving load 153 through the direct current-direct current DC-DC converter 142 and the second power supply module 12, so that the working time of the intelligent driving system is prolonged as much as possible.
In addition, when the system normally works, the second power supply module 12 does not participate in power supply, and meanwhile, the system can always ensure that the second power supply module 12 is in a relatively healthy electric quantity state, so that the service life of the second power supply module 12 is further ensured, and the maintenance of the second power supply module 12 by the life cycle of the whole vehicle is reduced.
The fourth embodiment of the invention provides a vehicle power supply system, which is characterized in that after passing through a power supply and a protection module, a first power supply module is connected, a second power supply module is connected through a power switch module, the two power supply modules are respectively connected with an electric quantity sensor for detecting the state of the power supply modules, and safety related loads (such as ESP, EPS, headlights and the like) and intelligent driving loads (such as cameras, radars and the like) adopt double power supplies for power supply. The power switch module internally comprises a direct current-direct current (DC-DC) converter and a first switch, the DC-DC converter can only supply power to the second power supply module by the first power supply module and can close output, and when a power supply system fails, the second power supply module supplies power for safety related loads and intelligent driving loads, so that the requirement of functional safety is met.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A vehicle power supply system, characterized by comprising: the power supply device comprises a first power supply module, a second power supply module, a control module and a power switch module; the second power supply module is externally connected with a load through the power switch module, the first power supply module is externally connected with the load, and the control module is respectively connected with the load and the power switch module;
the first power supply module is used for supplying power to the load;
the control module is used for detecting the condition that the first power supply module supplies power to the load; generating a switching signal based on the load power supply condition and sending the switching signal to the power switch module;
the power switch module is used for determining the switch state of the power switch module based on the received switch signal;
and the second power supply module is used for supplying power to the load based on the switching state of the power switch module.
2. The system of claim 1, wherein the power switch module comprises a first switch, and the second power module is externally connected to a load through the first switch in the power switch module;
the control module is specifically configured to generate a close switch signal and send the close switch signal to the power switch module when the first power supply module fails to normally supply power to the load;
the power switch module is specifically configured to determine that the first switch is closed based on the close switch signal;
and the second power supply module is used for being connected with the load through the first switch closed by the switch and supplying power to the load.
3. The system of claim 1, further comprising: a power supply and a protection module;
the power supply is connected with the first power supply module through the protection module, and the power supply is connected with the second power supply module after passing through the protection module and the power switch module;
the power supply is used for charging the first power supply module after the power supply is started.
4. The system of claim 2, further comprising: the power switch module comprises a direct current-direct current DC-DC converter;
the first electric quantity sensor is connected with the first power supply module, the second electric quantity sensor is connected with the second power supply module, and the first electric quantity sensor and the second electric quantity sensor are respectively connected with the control module;
the first electric quantity sensor is used for measuring first electric quantity of the first power supply module and sending the first electric quantity to the control module;
the second electric quantity sensor is used for measuring second electric quantity of the second power supply module and sending the second electric quantity to the control module;
the control module is further configured to determine a state of the DC-DC converter based on a relationship between the first electrical quantity and the second electrical quantity.
5. The system of claim 4, wherein the control module is further configured to control the DC-DC converter to start when the first electrical quantity is greater than a first threshold value and the second electrical quantity is less than a second threshold value before the power source is started, and the first power module charges the second power module, wherein the first threshold value is greater than or equal to the second threshold value.
6. The system according to claim 4, wherein the control module is further specifically configured to control the DC-DC converter to turn off when the second electric quantity is greater than a third threshold value or the first electric quantity is less than a fourth threshold value in a process that the first power supply module charges the second power supply module, and the first power supply module stops charging the second power supply module.
7. The system of claim 4,
and the control module is also used for controlling the DC-DC converter to be closed and controlling the first switch to be closed when the power supply fails so as to enable the first power supply module and the second power supply module to simultaneously supply power to the load.
8. The system of claim 4,
and the control module is further used for controlling the DC-DC converter to be started and controlling the first switch to be switched off under the condition that the power supply is detected to be started and the second electric quantity is smaller than a second threshold value, and the power supply charges the second power supply module.
9. The system of claim 1, wherein the first power module comprises: storage batteries, supercapacitors or lithium batteries; the second power supply module includes: a battery, a super capacitor or a lithium battery.
10. A power supply control method, comprising:
detecting the condition that the first power supply module supplies power to the load through the control module;
generating a switching signal based on the load power supply condition through a control module and sending the switching signal to a power switch module;
determining, by the power switch module, a switch state of the power switch module based on the received switch signal;
and supplying power to the load through a second power supply module based on the on-off state of the power switch module.
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| CN114024363A (en) * | 2021-11-26 | 2022-02-08 | 深圳威迈斯新能源股份有限公司 | Double-power-supply system based on electric automobile and control method thereof |
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| CN114475489A (en) * | 2021-12-27 | 2022-05-13 | 奇瑞汽车股份有限公司 | Power supply system of automobile, automobile and control method of power supply system of automobile |
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| CN114954315A (en) * | 2022-06-13 | 2022-08-30 | 中国第一汽车股份有限公司 | Whole car power supply system and vehicle |
| CN115459248A (en) * | 2022-09-09 | 2022-12-09 | 广州汽车集团股份有限公司 | Power distribution circuit, power distribution method and power consumption equipment |
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Application publication date: 20201208 |