CN219523830U - PEPS system based on 24V electrical system of vehicle - Google Patents

Abstract

The utility model discloses a PEPS system based on a 24V electrical system of a vehicle, which relates to the field of vehicle PEPS systems, wherein a DCDC voltage reduction chip which is arranged in the PEPS system and is electrically connected with the 24V electrical system is used for reducing the voltage output by the 24V electrical system and then inputting the reduced voltage to a low-frequency chip and a first LDO module which are electrically connected with the 24V electrical system, and the selectable range of the low-frequency chip and the LDO module is enlarged by reducing the input voltage, so that the chip cost is reduced, and meanwhile, the supply condition of the chip is ensured.

Description

PEPS system based on 24V electrical system of vehicle

Technical Field

The utility model relates to the field of vehicle PEPS systems, in particular to a PEPS system based on a 24V electrical system of a vehicle.

Background

Keyless entry and one-key start (PEPS) systems are very widely deployed in today's automobiles, and many passenger cars are deployed in very low deployment vehicle types, but the current use in light trucks is very small, on the one hand because the original commercial vehicle consumer has low requirements for comfort deployment, and on the other hand, the available range of PEPS related components of the 24V system is too small and the price is too high.

Most PEPS chips in the market are designed for 12V electrical systems of passenger cars, the working voltage range of the 12V electrical systems is 9V-16V, the working voltage range of the light truck type 24V electrical systems is 18V-32V, related chips meeting the requirements are difficult to find in the market, and the cost is high, such as low frequency chips, LDOs and the like.

Based on the PEPS designed by the conventional 24V electrical system, it is first required to find a low-frequency chip that meets the 24V electrical system, where the operating voltage range of the commonly used low-frequency chip in the market is 6V-28V, and is not required to meet the requirement of the 24V electrical system, and it is required to find a low-frequency chip with an operating voltage covering 18V-32V (such as a low-frequency chip with an operating voltage of 6V-36V), which can be difficult to find, or is expensive. The LDO,12V system only needs to find one LDO with 16V reduced to 5V, and the LDO is quite more and has quite favorable price; the LDO of the 24V system needs 32V to be reduced to 5V, the voltage difference is very large, obvious heating problem is brought, the output current capacity is reduced, the optional range of the LDO is smaller, and the price is very expensive.

Disclosure of Invention

In order to solve the problem that relevant chips meeting requirements are difficult to find in the market when the working voltage range of a light truck type 24V electrical system is 18V-32V, the utility model provides a PEPS system based on a vehicle 24V electrical system, which comprises the following components:

the device comprises a DCDC buck chip, an MCU, a low frequency chip, a first LDO module, a second LDO module and a radio frequency chip; wherein:

the DCDC step-down chip is electrically connected with the 24V electrical system and is used for accessing and reducing the voltage output by the 24V electrical system;

the first LDO module is electrically connected with the DCDC buck chip and is used for reducing the voltage input by the DCDC buck chip and providing a power supply for the low-frequency chip, the MCU and the second LDO module after buck;

the MCU is used for generating a control instruction;

the low-frequency chip is electrically connected with the DCDC buck chip and is in communication connection with the MCU, and is used for driving the low-frequency antenna to send a low-frequency signal to the intelligent key according to a control instruction generated by the MCU;

the radio frequency chip is used for receiving the relative position data sent by the intelligent key and sending the relative position data to the MCU; the relative position data is the relative position coordinates of the intelligent key and the low-frequency antenna, which are generated by the intelligent key according to the low-frequency signals sent by the low-frequency antenna;

the second LDO module is used for reducing the voltage input by the first LDO module and providing a power supply for the radio frequency chip after the voltage reduction;

the MCU is also used for controlling the opening and closing states of the vehicle door according to the relative position data sent by the radio frequency chip.

Further, the PEPS system further comprises: the CAN chip is electrically connected with the first LDO module and is in communication connection with the MCU;

the first LDO module is also used for inputting a power supply after voltage reduction to the CAN chip;

the MCU is specifically used for generating a vehicle door control signal according to the relative position data sent by the radio frequency chip and sending the vehicle door control signal to the CAN chip;

the CAN chip is used for generating door control data corresponding to the door control signals; the door control data is a CAN message for controlling the door to be opened by a BCM body controller.

Further, the PEPS system further comprises a high-side driver electrically connected with the 24V electrical system and in communication with the MCU;

the MCU is also used for generating a starting control instruction according to the relative position data sent by the radio frequency chip and issuing the starting control instruction to the high-side drive;

the high-side drive is used for controlling the starting of the vehicle engine according to the starting control instruction issued by the MCU.

Further, the low-frequency signal sent by the low-frequency antenna to the intelligent key is a 125kHz signal.

Further, the relative position data received by the radio frequency chip is 433MHz radio frequency signal.

Further, the first LDO module is a 5V LDO module.

Further, the second LDO module is a 3.3V LDO module.

Further, the low frequency chip is a 12V low frequency chip.

Compared with the prior art, the utility model at least has the following beneficial effects:

(1) According to the utility model, through the DCDC step-down chip which is arranged in the PEPS system and is electrically connected with the 24V electrical system, the voltage output by the 24V electrical system is reduced and then is input into the low-frequency chip and the first LDO module which are electrically connected with the 24V electrical system, and through reducing the input voltage, the selectable range of the low-frequency chip and the LDO module is enlarged, the chip cost is reduced, and meanwhile, the supply condition of the chip is ensured;

(2) According to the utility model, the input voltage is reduced through the DCDC buck chip, so that the condition that a 5V LDO module and a 12V low-frequency chip are still used under the condition of a 24V electrical system is met, and the heating problem caused by the fact that the existing PEPS system uses the LDO module which is stepped down from 32V to 5V and the voltage difference is overlarge is solved.

Drawings

FIG. 1 is a block diagram of a PEPS system based on a 24V electrical system of a vehicle.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Example 1

In order to meet the condition that the 5V LDO module and the 12V low frequency chip can still be used in the case of the 24V electrical system, as shown in fig. 1, the present utility model proposes a PEPS system based on the 24V electrical system of a vehicle, which includes:

the device comprises a DCDC buck chip, an MCU, a low frequency chip, a first LDO module, a second LDO module and a radio frequency chip; wherein:

the DCDC step-down chip is electrically connected with the 24V electrical system and is used for accessing and reducing the voltage output by the 24V electrical system;

specifically, the DCDC step-down chip steps down an 18V-32V power supply output by a 24V electrical system to 12V, and then inputs the 18V-32V power supply into the low-frequency chip and the first LDO module.

The first LDO module is electrically connected with the DCDC buck chip and is used for reducing the voltage input by the DCDC buck chip and providing a power supply for the low-frequency chip, the MCU and the second LDO module after buck;

specifically, the first LDO module steps down the 12V voltage input by the DCDC step-down chip to 5V and inputs the voltage to the MCU, the low-frequency chip, the second LDO module and the CAN chip.

The first LDO module is specifically a 5V LDO module (i.e., a 12V to 5V LDO).

The MCU is used for generating a control instruction;

the low-frequency chip is electrically connected with the DCDC buck chip and is in communication connection with the MCU, and is used for driving the low-frequency antenna to send a low-frequency signal to the intelligent key according to a control instruction generated by the MCU;

the low-frequency chip is specifically a 12V low-frequency chip.

Here, the 5V power input to the low frequency chip is used to supply power to the logic processing of the low frequency chip, and the low frequency chip is used to drive the low frequency antenna to transmit a low frequency signal after boosting the 12V power input to the low frequency chip.

The low-frequency signal sent by the low-frequency antenna to the intelligent key is a 125kHz signal.

The radio frequency chip is used for receiving the relative position data sent by the intelligent key and sending the relative position data to the MCU; the relative position data is the relative position coordinates of the intelligent key and the low-frequency antenna, which are generated by the intelligent key according to the low-frequency signals sent by the low-frequency antenna;

the relative position data received by the radio frequency chip is 433MHz radio frequency signal.

The second LDO module is used for reducing the voltage input by the first LDO module and providing a power supply for the radio frequency chip after the voltage reduction; the second LDO module is a 3.3V LDO module (i.e., a 5V to 3.3V LDO).

Specifically, the 3.3V LDO module steps down the 5V power input by the first LDO module to 3.3V and inputs the stepped down power to the radio frequency chip.

The MCU is also used for controlling the opening and closing states of the vehicle door according to the relative position data sent by the radio frequency chip.

The PEPS system further comprises: the CAN chip is electrically connected with the first LDO module and is in communication connection with the MCU;

the first LDO module is also used for inputting a power supply after voltage reduction to the CAN chip;

the MCU is specifically used for generating a vehicle door control signal according to the relative position data sent by the radio frequency chip and sending the vehicle door control signal to the CAN chip;

the CAN chip is used for generating door control data corresponding to the door control signals; the door control data is a CAN message for controlling the door to be opened by a BCM body controller.

The PEPS system further comprises a high-side driver electrically connected with the 24V electrical system and in communication connection with the MCU; the high side drive power source is directly derived from the 24V electrical system.

The MCU is also used for generating a starting control instruction according to the relative position data sent by the radio frequency chip and issuing the starting control instruction to the high-side drive;

the high-side drive is used for controlling the starting of the vehicle engine according to the starting control instruction issued by the MCU.

In this embodiment:

the radio frequency chip is of the type: PQJ7911AHN/C0C;

the model of the low-frequency chip is as follows: ATA5291-GJQW;

the model of the CAN chip is as follows: ATA6562-GAQW1;

the model of the first LDO module is as follows: R1524S050B-E2-KE;

the model of the second LDO module is as follows: BU33SD2MG-MTR;

the DCDC step-down chip is of the type: MPQ4570GF-AEC1-Z;

the MCU is of the type: R7F7010233AFP.

The embodiment needs to be explained that the MCU is used as a micro control unit and is responsible for issuing control instructions to the low-frequency chip to enable the low-frequency chip to work; the low frequency chip is responsible for driving the low frequency antenna of each mounted position on the vehicle, the low frequency chip can drive the low frequency antenna to send 125 kHz's low frequency signal after receiving MCU's control command, after the smart key received the low frequency signal, judge the distance of smart key from the low frequency antenna according to signal strength, through the low frequency antenna of vehicle interior and exterior installation, judge the accurate position coordinate of smart key promptly the relative position coordinate of smart key and low frequency antenna to relative position coordinate is through 433M radio frequency signal transmission to radio frequency chip, the radio frequency chip will receive 433M radio frequency signal promptly relative position coordinate transmission to MCU. MCU judges whether the intelligent key is in the car or outside the car through relative position coordinates, when passenger needs to get into the car and MCU judges that the intelligent key is near the door (in the preset range of the door), CAN give the CAN chip send door control signal and unlock door signal promptly, the CAN chip converts the door control signal that MCU sent into CAN message to send to BCM automobile body controller through the CAN line, BCM automobile body controller is opened according to the CAN message control door that receives, the passenger just so CAN realize no key (i.e. does not use physical mechanical key to open the door) to get into in the car. When a passenger needs to ignite to start the vehicle, the MCU judges that the legal intelligent key (namely the intelligent key belonging to the vehicle) is in the vehicle according to the relative position coordinates, and then the MCU gives a starting control instruction to the high-side chip, so that the high-side chip supplies power to an ignition relay in the vehicle, the engine is started after the ignition relay is attracted, and the passenger can start the vehicle without a key (without mechanical key screwing).

According to the utility model, through the DCDC step-down chip which is arranged in the PEPS system and is electrically connected with the 24V electrical system, the voltage output by the 24V electrical system is reduced and then is input into the low-frequency chip and the first LDO module which are electrically connected with the 24V electrical system, and the low-frequency chip (12V low-frequency chip) and the LDO module (5V LDO module) of the 12V electrical system can still be used under the condition of the 24V electrical system by reducing the input voltage, so that the selectable range of the low-frequency chip and the LDO module is enlarged, the chip cost is reduced, and meanwhile, the supply condition of the chip is ensured.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to herein as "first," "second," "a," and the like are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

Claims (8)

1. A PEPS system based on a 24V electrical system of a vehicle, comprising:

the device comprises a DCDC buck chip, an MCU, a low frequency chip, a first LDO module, a second LDO module and a radio frequency chip; wherein:

the DCDC step-down chip is electrically connected with the 24V electrical system and is used for accessing and reducing the voltage output by the 24V electrical system;

the first LDO module is electrically connected with the DCDC buck chip and is used for reducing the voltage input by the DCDC buck chip and providing a power supply for the low-frequency chip, the MCU and the second LDO module after buck;

the MCU is used for generating a control instruction;

the low-frequency chip is electrically connected with the DCDC buck chip and is in communication connection with the MCU, and is used for driving the low-frequency antenna to send a low-frequency signal to the intelligent key according to a control instruction generated by the MCU;

the radio frequency chip is used for receiving the relative position data sent by the intelligent key and sending the relative position data to the MCU; the relative position data is the relative position coordinates of the intelligent key and the low-frequency antenna, which are generated by the intelligent key according to the low-frequency signals sent by the low-frequency antenna;

the second LDO module is used for reducing the voltage input by the first LDO module and providing a power supply for the radio frequency chip after the voltage reduction;

the MCU is also used for controlling the opening and closing states of the vehicle door according to the relative position data sent by the radio frequency chip.

2. The PEPS system according to claim 1, wherein the PEPS system further comprises: the CAN chip is electrically connected with the first LDO module and is in communication connection with the MCU;

the first LDO module is also used for inputting a power supply after voltage reduction to the CAN chip;

the MCU is specifically used for generating a vehicle door control signal according to the relative position data sent by the radio frequency chip and sending the vehicle door control signal to the CAN chip;

the CAN chip is used for generating door control data corresponding to the door control signals; the door control data is a CAN message for controlling the door to be opened by a BCM body controller.

3. The PEPS system according to claim 2, wherein the PEPS system further comprises a high side drive electrically connected to the 24V electrical system and in communication with the MCU;

the MCU is also used for generating a starting control instruction according to the relative position data sent by the radio frequency chip and issuing the starting control instruction to the high-side drive;

the high-side drive is used for controlling the starting of the vehicle engine according to the starting control instruction issued by the MCU.

4. The PEPS system according to claim 3, wherein the low frequency antenna transmits a 125kHz signal to the key fob.

5. The PEPS system according to claim 4, wherein the radio frequency chip receives 433MHz radio frequency signals as the relative position data.

6. The PEPS system according to claim 1, wherein the first LDO module is a 5V LDO module.

7. The PEPS system according to claim 1, wherein the second LDO module is a 3.3V LDO module.

8. The PEPS system according to claim 1, wherein the low frequency chip is a 12V low frequency chip.