CN113032020B

CN113032020B - Method for DCM to stably receive RKE single-frame RF signals in low-power-consumption mode

Info

Publication number: CN113032020B
Application number: CN202110141618.XA
Authority: CN
Inventors: 刘屹坤; 陈家玉; 闻佳怡; 徐保江; 段威
Original assignee: Shanghai Jihan Electronic Technology Co ltd
Current assignee: Shanghai Jihan Electronic Technology Co ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2023-04-07
Anticipated expiration: 2041-02-03
Also published as: CN113032020A

Abstract

The invention relates to a method for a DCM to stably receive RKE single-frame RF signals in a low power consumption mode, which comprises the steps of firstly, judging whether an MCU is allowed to enter a sleep mode according to a working state, then setting a sleep wake-up strategy, waking up the MCU when 10ms is reached, enabling an RF receiving chip, detecting whether the RF signals are received after 5ms of the wake-up state is kept, keeping the wake-up state for 300ms after the RF signals are received, detecting whether the received RF signals are effective or wake-up sources are excited after 300ms, entering a normal working mode if yes, and otherwise, continuing entering the sleep mode. The invention adjusts the dormancy and awakening strategies of the MCU by calculating the time relation between the single-frame RF data and the preamble thereof, and realizes the stable reception of the RF signal on the premise of ensuring low power consumption of the product.

Description

Method for DCM to stably receive RKE single-frame RF signals in low-power-consumption mode

Technical Field

The invention relates to the technical field of DCM signal receiving, in particular to a method for stably receiving RKE single-frame RF signals by a DCM in a low power consumption mode.

Background

Based on RKE of the HCS300, only one frame of RF signal is triggered by a single button input; the product MCU receives the RF signal by using the Capture Device, the MCU needs to sleep to ensure the DCM low power consumption, the MCU Capture Device stops working after the sleep, but the RF signal of the RKE needs to be received by the MCU Capture Device, namely the MCU needs to be awakened to receive the RKE signal, namely the DCM enters a low power consumption mode and then the RF receiving chip is enabled and disabled periodically, therefore, when the DCM is in the low power consumption working mode, the RF receiving chip is enabled periodically to receive the RKE signal to ensure the low power consumption, namely the RKE preamble can not be received.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for stably receiving an RKE single-frame RF signal by a DCM under a low power consumption mode so as to solve the defects in the prior art.

The technical scheme for solving the technical problems is as follows:

the method for the DCM to stably receive the RKE single-frame RF signals in the low power consumption mode comprises the following steps:

s1: the MCU judges whether to allow to enter the sleep mode according to the working state, when the condition accords with the sleep mode, the sleep countdown is carried out, the RF receiving chip cannot be used when the countdown is finished, and the MCU enters the sleep mode after the 10ms awakening interruption is set;

s2: and initializing the MCU when the time reaches 10ms, enabling the RF receiving chip, keeping the awakening state for 5ms, detecting whether an RF signal is received, keeping the awakening state for 300ms after the RF signal is received, detecting whether the received RF signal is an effective RF signal or whether an awakening source is excited by the MCU after 300ms, if so, entering a normal working mode by the MCU, otherwise, continuously entering a sleep mode by the MCU, and repeatedly executing the step S2.

Further, in step S2, the RF signal is a 66-bit signal, and 1te =400us,1TE allowed error is 200us, and preamble is 23TE;

further, in step S2, the MCU starts to receive the 4TE preamble for 800us to 2400us to increase the receiving sensitivity;

the beneficial effects of the invention are: the invention adjusts the dormancy and awakening strategies of the MCU by calculating the time relation between the single-frame RF data and the preamble thereof, and realizes the stable reception of the RF signal on the premise of ensuring low power consumption of the product.

Drawings

FIG. 1 is a block diagram of a codeword according to the present invention;

FIG. 2 is a flow chart of a sleep strategy according to the present invention;

FIG. 3 is a diagram of a codeword format according to the present invention;

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

As shown in fig. 1, the method for the DCM to stably receive the RKE single frame RF signal in the low power consumption mode includes the following steps:

s1: the MCU judges whether to allow the MCU to enter the sleep mode according to the working state, when the condition accords with the sleep mode, the MCU counts down the sleep mode, the RF receiving chip cannot be started after the countdown is finished, and the MCU enters the sleep mode after setting 10ms awakening interrupt;

further, in step S2, the MCU starts to prepare to receive the RF signal after receiving the 4TE preamble for 800us to 2400us, so as to improve the receiving sensitivity;

in particular, when the wake-up source is activated, i.e. when a button is pressed, the HCS300 sends a frame of 66-bit codeword RF signals (1te =400us,1te allowed error is 200us, codeword format and codeword composition are shown in fig. 1 and 2), and the preamble is 23TE.

Meanwhile, the sleep time of the MCU is reduced to wake up for 5ms every 10ms, and the receiving of the 4TE preamble starts to prepare for receiving the RF signal (800 us to 2400us, the receiving sensitivity is improved), and the receiving of the RF signal is prepared to be used as an adaptive keeping-wake-up strategy (keeping awake for 300 ms); therefore, the RF signal receiving stability is ensured on the premise of realizing low power consumption of the product.

Referring to fig. 3: the RF signal is stably received on the premise of ensuring low power consumption for the product. The DCM wakes up the receiving RF signals and the detection wake-up source periodically by the MCU in the low power consumption mode, the specific strategy is to wake up for 5ms every 10ms, the receiving time of the RF preamble is reduced from 8TE before wake-up to 4TE, the sensitivity of receiving the RF preamble within 5ms is improved, and the DCM is kept awake for 300ms after receiving the preamble to detect the wake-up source (including the effective RF signals), so that the DCM can be ensured to enter a normal working mode through the RKE signals normally.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

The method for the DCM to stably receive the RKE single-frame RF signals in the low power consumption mode is characterized in that: the method comprises the following steps: s1: the MCU judges whether to allow to enter the sleep mode according to the working state, when the condition accords with the sleep mode, the sleep countdown is carried out, the RF receiving chip cannot be used when the countdown is finished, and the MCU enters the sleep mode after the 10ms awakening interruption is set;

s2): initializing the MCU when the time reaches 10ms, enabling the RF receiving chip, keeping the awakening state for 5ms, detecting whether an RF signal is received, keeping the awakening state for 300ms after the RF signal is received, detecting whether the received RF signal is an effective RF signal or whether an awakening source is excited by the MCU after 300ms, if so, entering a normal working mode by the MCU, otherwise, continuing entering a sleep mode by the MCU, and repeatedly executing the step S2;

in the step S2, the RF signal is a 66-bit signal, and 1te =400us,1te allowable error is 200us, preamble is 23TE;

in the step S2, the MCU starts to prepare to receive the RF signal after receiving the 4TE preamble for 800us to 2400us, so as to improve the receiving sensitivity;

the DCM wakes up to receive the RF signal and detect the wake-up source periodically under the low power consumption mode, the specific strategy is to wake up for 5ms every 10ms, the reception of the RF preamble is reduced from 8TE before wake-up to 4TE, the sensitivity of receiving the RF preamble within 5ms is improved, the DCM keeps awake for 300ms after receiving the preamble to detect the wake-up source, and the DCM can be ensured to enter a normal working mode through the RKE signal normally.