阅读说明：本技术 一种tpms多车速信号并存的处理及失效判定方法 (Processing and failure judgment method for coexistence of TPMS (tire pressure monitor System) multiple vehicle speed signals ) 是由 邓宇 丘文胜 彭杨 崔硕 于 2019-03-05 设计创作，主要内容包括：本发明公开一种TPMS多车速信号并存的处理及失效判定方法。所述方法包括：以刷新周期为时间间隔实时接收车速报文信号；从接收到的车速报文信号中获取车速数据,以最大的车速作为当前车速；计算每个车速报文信号丢失的时间,如果某车速报文信号丢失的时间大于设定的时间阈值,则认为所述车速报文信号对应的车速传感器失效。本发明能够实现TPMS车速传感器失效的自动检测。通过以最大的车速作为当前车速,即使有部分车速信号丢失,仍然能够获得稳定的车速信号。(The invention discloses a processing and failure judgment method for coexistence of TPMS (tire pressure monitor System) multiple vehicle speed signals. The method comprises the following steps: receiving a vehicle speed message signal in real time by taking a refreshing period as a time interval; acquiring vehicle speed data from the received vehicle speed message signal, and taking the maximum vehicle speed as the current vehicle speed; and calculating the loss time of each vehicle speed message signal, and if the loss time of a certain vehicle speed message signal is greater than a set time threshold, determining that the vehicle speed sensor corresponding to the vehicle speed message signal is invalid. The invention can realize the automatic detection of the failure of the TPMS vehicle speed sensor. By taking the maximum vehicle speed as the current vehicle speed, a stable vehicle speed signal can be obtained even if a part of the vehicle speed signal is lost.)

1. A processing and failure judgment method for coexistence of multiple TPMS vehicle speed signals is characterized by comprising the following steps:

step 1, receiving a vehicle speed message signal in real time by taking a refreshing period as a time interval;

step 2, obtaining vehicle speed data from the received vehicle speed message signal, and taking the maximum vehicle speed as the current vehicle speed;

and 3, calculating the loss time of each vehicle speed message signal, and if the loss time of a certain vehicle speed message signal is greater than a set time threshold, determining that the vehicle speed sensor corresponding to the vehicle speed message signal is invalid.

2. The method of claim 1, wherein the refresh period is 1 second.

3. The method of claim 2, wherein the time threshold is 570 seconds.

4. The method of claim 1, wherein the method of calculating the time to loss of signal for each vehicle speed message comprises:

calculating the signal loss time of the vehicle speed message by adopting a signal loss timer;

if a vehicle speed message signal is received in the current refreshing period, resetting a signal loss timer;

if the vehicle speed message signal is not received in the current refreshing period and the current vehicle speed is less than the set vehicle speed threshold value, the value of the signal loss timer is unchanged;

and if the message signal is not received in the current refreshing period and the vehicle speed is greater than or equal to the set vehicle speed threshold value, setting the value of the signal loss timer and increasing the refreshing period by one.

5. The method of claim 4, wherein the vehicle speed threshold is 30 km/h.

Technical Field

The invention belongs to the technical field of TPMS (Tire Pressure Monitoring System), and particularly relates to a processing and failure judgment method for coexistence of multiple vehicle speed signals of TPMS.

Background

In recent years, rapid development and fierce competition of the automobile industry in China and release and implementation of national standards of tire pressure promote rapid popularization of TPMS in passenger vehicles. The TPMS is a system for monitoring pressure, temperature, acceleration, and the like of an automobile tire in real time. It is a commonly adopted strategy for a simplex tire pressure monitoring system to monitor the failure of a vehicle speed sensor by setting a vehicle speed threshold value through a tire pressure receiver. However, due to various historical reasons of a vehicle factory, the current situation that various vehicle speed CAN bus signal transmission sources (a vehicle speed sensor, an ABS, an ESC, a TCM, a gateway and the like) coexist exists in the whole vehicle network architecture, that is, a situation that a plurality of vehicle speed IDs exist on the CAN network at the same time, how to timely and effectively solve an arbitration mechanism and a TPMS sensor failure monitoring strategy when a plurality of vehicle speeds coexist, and the difficulty in the platform of a tire pressure monitoring system of the vehicle factory is undoubtedly increased.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a processing and failure judgment method for the coexistence of multiple vehicle speed signals of a TPMS.

In order to achieve the purpose, the invention adopts the following technical scheme:

a processing and failure judgment method for coexistence of multiple TPMS vehicle speed signals comprises the following steps:

step 1, receiving a vehicle speed message signal in real time by taking a refreshing period as a time interval;

step 2, obtaining vehicle speed data from the received vehicle speed message signal, and taking the maximum vehicle speed as the current vehicle speed;

and 3, calculating the loss time of each vehicle speed message signal, and if the loss time of a certain vehicle speed message signal is greater than a set time threshold, determining that the vehicle speed sensor corresponding to the vehicle speed message signal is invalid.

Further, the refresh period is 1 second.

Further, the time threshold is 570 seconds.

Further, the method for calculating the signal loss time of each vehicle speed message comprises the following steps:

calculating the signal loss time of the vehicle speed message by adopting a signal loss timer;

if a vehicle speed message signal is received in the current refreshing period, resetting a signal loss timer;

if the vehicle speed message signal is not received in the current refreshing period and the current vehicle speed is less than the set vehicle speed threshold value, the value of the signal loss timer is unchanged;

and if the message signal is not received in the current refreshing period and the vehicle speed is greater than or equal to the set vehicle speed threshold value, setting the value of the signal loss timer and increasing the refreshing period by one.

Further, the vehicle speed threshold is 30 km/h.

Compared with the prior art, the invention has the following beneficial effects:

the invention receives the vehicle speed message signals in real time and obtains vehicle speed data, calculates the loss time of each vehicle speed message signal by taking the maximum vehicle speed as the current vehicle speed, and judges whether the vehicle speed sensor corresponding to the vehicle speed message signals fails according to whether the loss time of the vehicle speed message signals is greater than a set time threshold value, thereby realizing the automatic detection of the vehicle speed sensor failure. By taking the maximum vehicle speed as the current vehicle speed, a stable vehicle speed signal can be obtained even if a part of the vehicle speed signal is lost.

Drawings

Fig. 1 is a flowchart of a method for processing a TPMS with multiple vehicle speed signals and determining a failure in the TPMS according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The flow chart of the processing and failure determination method for the coexistence of multiple vehicle speed signals of the TPMS in the embodiment of the invention is shown in FIG. 1, and the method comprises the following steps:

s101, receiving a vehicle speed message signal in real time by taking a refreshing period as a time interval;

s102, acquiring vehicle speed data from the received vehicle speed message signal, and taking the maximum vehicle speed as the current vehicle speed;

s103, calculating the loss time of each vehicle speed message signal, and if the loss time of a certain vehicle speed message signal is greater than a set time threshold, determining that the vehicle speed sensor corresponding to the vehicle speed message signal is invalid.

Preferably, the refresh period is 1 second.

Preferably, the time threshold is 570 seconds.

As an alternative embodiment, the method for calculating the signal loss time of each vehicle speed message comprises the following steps:

calculating the signal loss time of the vehicle speed message by adopting a signal loss timer;

if a vehicle speed message signal is received in the current refreshing period, resetting a signal loss timer;

if the vehicle speed message signal is not received in the current refreshing period and the current vehicle speed is less than the set vehicle speed threshold value, the value of the signal loss timer is unchanged;

and if the message signal is not received in the current refreshing period and the vehicle speed is greater than or equal to the set vehicle speed threshold value, setting the value of the signal loss timer and increasing the refreshing period by one.

Preferably, the vehicle speed threshold is 30 km/h. When the vehicle speed is 20-25 km/h, the TPMS sensor sends message signals in a period of 60 seconds, the loss time of the vehicle speed message signals is counted over 30km/h, and the speed redundancy is about 5-10 km/h.