阅读说明：本技术 商用车气制动系统气压报警方法 (Air pressure alarm method for commercial vehicle air brake system ) 是由 江天欣 孙建军 吕征 李华华 徐冕 于 2020-06-30 设计创作，主要内容包括：本发明涉及商用车气制动系统气压报警方法,包含步骤：获取前回路气压值、后回路气压值、驻挂回路气压值；与行车制动低压报警阈值、行车制动高压报警阈值、驻挂回路正常压力上限值、驻挂回路正常压力下限值分别对比；根据对比结果输出气压过低信号,或气压正常信号,或驻挂回路气压偏低信号,或驻挂回路气压偏高信号,或气压过高信号。本发明增加了对驻挂回路的监测及相关报警方法,也增加了限压阀发生故障时的判断逻辑,从而当限压阀和驻挂回路发生故障时,能及时做出正确的判断并报警,大幅提升了行车的安全性；增加了对由于高压故障带来的复杂情况下的报警方法,极大降低了误报、漏报的情况发生。(The invention relates to an air pressure alarm method of a commercial vehicle air brake system, which comprises the following steps: acquiring a front loop air pressure value, a rear loop air pressure value and a suspension loop air pressure value; respectively comparing the alarm threshold value with a service brake low-pressure alarm threshold value, a service brake high-pressure alarm threshold value, a normal pressure upper limit value of a parking loop and a normal pressure lower limit value of the parking loop; and outputting an air pressure over-low signal, an air pressure normal signal, an air pressure lower signal of the suspension loop, an air pressure higher signal of the suspension loop or an air pressure over-high signal according to the comparison result. The invention adds a monitoring and related alarming method for the parking loop and also adds a judgment logic when the pressure limiting valve fails, so that when the pressure limiting valve and the parking loop fail, correct judgment and alarming can be timely made, and the driving safety is greatly improved; an alarm method under complex conditions caused by high-voltage faults is added, and the occurrence of false alarm and missing alarm is greatly reduced.)

1. A commercial vehicle air brake system air pressure alarm method is characterized in that: comprises the following steps:

s100, continuously acquiring a front loop air pressure value and a rear loop air pressure value of the commercial vehicle air braking system and a suspension loop air pressure value for representing suspension loop air pressure behind a pressure limiting valve according to a manually preset acquisition frequency;

s200, respectively comparing the front loop air pressure value and the rear loop air pressure value with a manually preset service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the front loop is not higher than the service brake low-pressure alarm threshold value or the air pressure value of the rear loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure too-low signal;

s300, respectively comparing the front loop air pressure value and the rear loop air pressure value with an upper limit value of the normal pressure of the manually preset suspension loop, and performing the following operations according to the comparison result:

if the front loop air pressure value is not higher than the parking loop normal pressure upper limit value or the rear loop air pressure value is not higher than the parking loop normal pressure upper limit value, comparing the parking loop air pressure value with the service brake low pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal; otherwise, comparing the air pressure value of the parking loop with a manually preset service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake high-pressure alarm threshold, outputting an air pressure normal signal; otherwise, outputting an over-high air pressure signal;

s400, respectively comparing the front loop air pressure value, the rear loop air pressure value and the service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the front loop air pressure value is not higher than the service braking high-pressure alarm threshold value, or the rear loop air pressure value is not higher than the service braking high-pressure alarm threshold value, comparing the parking loop air pressure value with the service braking low-pressure alarm threshold value, the service braking high-pressure alarm threshold value, the parking loop normal pressure upper limit value and a manually preset parking loop normal pressure lower limit value one by one, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal;

if the air pressure value of the parking loop is higher than the service brake low-pressure alarm threshold and not higher than the lower limit value of the normal pressure of the parking loop, outputting a signal that the air pressure of the parking loop is lower;

if the air pressure value of the suspension loop is higher than the lower limit value of the normal pressure of the suspension loop and is not higher than the upper limit value of the normal pressure of the suspension loop, outputting the air pressure normal signal;

if the air pressure value of the parking loop is higher than the upper limit value of the normal pressure of the parking loop and is not higher than the service brake high-pressure alarm threshold, outputting a signal that the air pressure of the parking loop is higher;

if the air pressure value of the parking loop is higher than the service brake high-pressure alarm threshold value, the air pressure is over-high;

s500, respectively comparing the front loop air pressure value, the rear loop air pressure value and the service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the front loop air pressure value is higher than the service brake high-pressure alarm threshold value, or the rear loop air pressure value is higher than the service brake high-pressure alarm threshold value, comparing the parking loop air pressure value with the service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal;

and if the air pressure value of the parking loop is higher than the service brake low-pressure alarm threshold value, outputting an air pressure overhigh signal.

2. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle according to claim 1, wherein: also comprises the following steps:

s600, according to the output result of each step from S100 to S500, the following operations are carried out:

if the output result is the air pressure normal signal, the vehicle-mounted display screen does not display;

if the output result is the air pressure over-low signal, displaying the air pressure over-low signal on the vehicle-mounted display screen, and not receiving the output result until manual reset; and otherwise, updating and displaying the output result on the vehicle-mounted display screen in real time according to the acquisition frequency.

3. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle according to claim 1, wherein: the front loop air pressure value is collected by a front loop air pressure sensor which is arranged on a pipeline from the air storage cylinder to the foot valve and is close to one end of the air storage cylinder, and is output to the vehicle-mounted ECU.

4. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle according to claim 1, wherein: and the rear loop air pressure value is acquired by a rear loop air pressure sensor which is arranged on the pipeline from the air storage cylinder to the foot valve and is close to one end of the foot valve, and is output to the vehicle-mounted ECU.

5. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle according to claim 1, wherein: and the air pressure value of the parking loop is acquired by a parking loop air pressure sensor arranged behind the pressure limiting valve and is output to the vehicle-mounted ECU.

6. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle according to claim 1, wherein: the lower limit value of the normal pressure of the suspension loop is 700 kPa; the normal upper limit value of the suspension loop is 900 kPa.

7. The pneumatic alarm method for the pneumatic brake system of a commercial vehicle as claimed in claim 2, wherein: the collection frequency is 1 HZ.

Technical Field

The invention relates to the technical field of vehicle braking, in particular to an air pressure alarm method of a commercial vehicle air brake system.

Background

The air pressure alarm of the braking system can be displayed on an instrument panel in real time to remind a driver of the current safety condition of the vehicle; for vehicles employing pneumatic brake systems, brake system air pressure warning is a very important safety indicator.

However, the current relevant laws and regulations only require low-pressure alarm, so that the alarm method is quite single; specifically, the existing air pressure alarm method of the brake system is as follows: detecting the air pressure value of the front loop and the air pressure value of the rear loop; comparing the air pressure value of the front loop and the air pressure value of the rear loop with a low-pressure alarm air pressure value preset manually; if at least one is lower than the low-pressure alarm air pressure value, displaying the low-pressure information on the instrument, otherwise, not displaying.

According to the newly published technical conditions for motor vehicle operation safety GB7258-2017, the brake air pressure requirement is increased to 10bar, and part of main engine plants are even increased to 12 bar. In this case, a pressure limiting valve is required to be added to the circuit of the pneumatic brake system.

When the pressure limiting valve is in fault, the air pressure of the suspension loop is too low or too high; specifically, the method comprises the following steps: if the braking air pressure of the trailer is too low, the braking efficiency of the trailer is insufficient, and the trailer cannot be braked; if the air pressure of the trailer is too high, and the warning of the air pressure problem when the high air pressure warning and the pressure limiting valve are in failure is not given, the damage of the related valve on the trailer can be caused.

From the above, the currently adopted simple alarm method causes that the main flow host factory air pressure sensors stay at 2 and only monitor the driving air pressure; the drawbacks of this approach are:

1. the prior art does not consider the judgment logic when the pressure limiting valve fails, and lacks a monitoring and related alarming method for the suspension loop, so that when the pressure limiting valve and the suspension loop fail, correct judgment and alarming cannot be carried out, and the driving safety is influenced;

2. in the prior art, high-pressure faults caused by great increase of brake air pressure and an alarm method under complex conditions caused by the high-pressure faults are not considered, so that the situations of false alarm and missed alarm are caused.

Disclosure of Invention

The invention provides an air pressure alarm method of a commercial vehicle air brake system, aiming at solving the problems that when a pressure limiting valve and a parking loop are in failure, correct judgment can be made in time and an alarm can be given, so that the driving safety is greatly improved; in addition, the situations of false alarm and missing report can be greatly reduced.

In order to solve the problems, the technical scheme provided by the invention is as follows:

the air pressure alarming method of the commercial vehicle air braking system comprises the following steps:

s100, continuously acquiring a front loop air pressure value and a rear loop air pressure value of the commercial vehicle air braking system and a suspension loop air pressure value for representing suspension loop air pressure behind a pressure limiting valve according to a manually preset acquisition frequency;

s200, respectively comparing the front loop air pressure value and the rear loop air pressure value with a manually preset service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the front loop is not higher than the service brake low-pressure alarm threshold value or the air pressure value of the rear loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure too-low signal;

s300, respectively comparing the front loop air pressure value and the rear loop air pressure value with an upper limit value of the normal pressure of the manually preset suspension loop, and performing the following operations according to the comparison result:

if the front loop air pressure value is not higher than the parking loop normal pressure upper limit value or the rear loop air pressure value is not higher than the parking loop normal pressure upper limit value, comparing the parking loop air pressure value with the service brake low pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal; otherwise, comparing the air pressure value of the parking loop with a manually preset service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake high-pressure alarm threshold, outputting an air pressure normal signal; otherwise, outputting an over-high air pressure signal;

s400, respectively comparing the front loop air pressure value, the rear loop air pressure value and the service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the front loop air pressure value is not higher than the service braking high-pressure alarm threshold value, or the rear loop air pressure value is not higher than the service braking high-pressure alarm threshold value, comparing the parking loop air pressure value with the service braking low-pressure alarm threshold value, the service braking high-pressure alarm threshold value, the parking loop normal pressure upper limit value and a manually preset parking loop normal pressure lower limit value one by one, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal;

if the air pressure value of the parking loop is higher than the service brake low-pressure alarm threshold and not higher than the lower limit value of the normal pressure of the parking loop, outputting a signal that the air pressure of the parking loop is lower;

if the air pressure value of the suspension loop is higher than the lower limit value of the normal pressure of the suspension loop and is not higher than the upper limit value of the normal pressure of the suspension loop, outputting the air pressure normal signal;

if the air pressure value of the parking loop is higher than the upper limit value of the normal pressure of the parking loop and is not higher than the service brake high-pressure alarm threshold, outputting a signal that the air pressure of the parking loop is higher;

if the air pressure value of the parking loop is higher than the service brake high-pressure alarm threshold value, the air pressure is over-high;

s500, respectively comparing the front loop air pressure value, the rear loop air pressure value and the service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the front loop air pressure value is higher than the service brake high-pressure alarm threshold value, or the rear loop air pressure value is higher than the service brake high-pressure alarm threshold value, comparing the parking loop air pressure value with the service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal;

and if the air pressure value of the parking loop is higher than the service brake low-pressure alarm threshold value, outputting an air pressure overhigh signal.

Preferably, the method further comprises the following steps:

s600, according to the output result of each step from S100 to S500, the following operations are carried out:

if the output result is the air pressure normal signal, the vehicle-mounted display screen does not display;

if the output result is the air pressure over-low signal, displaying the air pressure over-low signal on the vehicle-mounted display screen, and not receiving the output result until manual reset; and otherwise, updating and displaying the output result on the vehicle-mounted display screen in real time according to the acquisition frequency.

Preferably, the front loop air pressure value is acquired by a front loop air pressure sensor which is arranged on a pipeline from the air storage cylinder to the foot valve and is close to one end of the air storage cylinder, and is output to the vehicle-mounted ECU.

Preferably, the rear loop air pressure value is acquired by a rear loop air pressure sensor which is arranged on the pipeline from the air storage cylinder to the foot valve and is close to one end of the foot valve, and is output to the vehicle-mounted ECU.

Preferably, the air pressure value of the parking loop is collected by a parking loop air pressure sensor installed behind the pressure limiting valve and output to the vehicle-mounted ECU.

Preferably, the lower limit value of the normal pressure of the suspension loop is 700 kPa; the normal upper limit value of the suspension loop is 900 kPa.

Preferably, the acquisition frequency is 1 HZ.

Compared with the prior art, the invention has the following advantages:

1. the monitoring and related alarming method for the parking loop is added, and the judgment logic when the pressure limiting valve fails is also added, so that when the pressure limiting valve and the parking loop fail, correct judgment and alarming can be timely made, and the driving safety is greatly improved;

2. an alarm method under complex conditions caused by high-voltage faults is added, and the occurrence of false alarm and missing alarm is greatly reduced.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of the present invention.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.

The air pressure alarm method of the commercial vehicle air brake system shown in fig. 1 comprises the following steps:

s100, continuously acquiring a front loop air pressure value and a rear loop air pressure value of the commercial vehicle air braking system and a parking loop air pressure value for representing the parking loop air pressure behind the pressure limiting valve according to a manually preset acquisition frequency.

In the present embodiment, the acquisition frequency is 1 HZ; in practical application, other frequencies can be set according to needs, and the implementation of the invention is not influenced.

In the embodiment, the air pressure value of the front loop is acquired by a front loop air pressure sensor which is arranged on a pipeline from the air storage cylinder to the foot valve and is close to one end of the air storage cylinder; the front loop air pressure sensor is in electric signal connection with the vehicle-mounted ECU, and outputs the acquired front loop air pressure value to the vehicle-mounted ECU.

In the embodiment, the air pressure value of the rear loop is acquired by a rear loop air pressure sensor which is arranged on a pipeline from the air storage cylinder to the foot valve and is close to one end of the foot valve; the rear loop air pressure sensor is in electric signal connection with the vehicle-mounted ECU, and outputs the acquired rear loop air pressure value to the vehicle-mounted ECU.

In the specific embodiment, the air pressure value of the suspension loop is acquired by an air pressure sensor of the suspension loop arranged behind the pressure limiting valve; and the parking loop air pressure sensor is in electric signal connection with the vehicle-mounted ECU, and outputs the acquired parking loop air pressure value to the vehicle-mounted ECU.

It should be noted that, in this embodiment, the upper limit value of the normal pressure of the suspension loop is 900 kPa; in practical application, other air pressure values can be set according to requirements, and the implementation of the invention is not influenced.

S200, respectively comparing the front loop air pressure value and the rear loop air pressure value with a manually preset service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the front loop is not higher than the service brake low-pressure alarm threshold value, or the air pressure value of the rear loop is not higher than the service brake low-pressure alarm threshold value, an air pressure too-low signal is output.

S300, respectively comparing the air pressure value of the front loop and the air pressure value of the rear loop with the upper limit value of the normal pressure of the manually preset suspension loop, and performing the following operations according to the comparison result:

if the air pressure value of the front loop is not higher than the upper limit value of the normal pressure of the parking loop, or the air pressure value of the rear loop is not higher than the upper limit value of the normal pressure of the parking loop, comparing the air pressure value of the parking loop with a service brake low-pressure alarm threshold, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, outputting an air pressure over-low signal; otherwise, comparing the air pressure value of the parking loop with a manually preset service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake high-pressure alarm threshold value, outputting an air pressure normal signal; otherwise, outputting an over-high air pressure signal.

S400, respectively comparing the air pressure value of the front loop and the air pressure value of the rear loop with a service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

it should be noted that, in this embodiment, the lower limit of the normal pressure of the suspension loop is 700 kPa; in practical application, other air pressure values can be set according to requirements, and the implementation of the invention is not influenced.

If the air pressure value of the front loop is not higher than the service braking high-pressure alarm threshold value, or the air pressure value of the rear loop is not higher than the service braking high-pressure alarm threshold value, comparing the air pressure value of the parking loop with the service braking low-pressure alarm threshold value, the service braking high-pressure alarm threshold value, the upper limit value of the normal pressure of the parking loop and the lower limit value of the normal pressure of the parking loop preset manually one by one, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, an air pressure too low signal is output.

And if the air pressure value of the parking loop is higher than the service brake low pressure alarm threshold value and is not higher than the normal pressure lower limit value of the parking loop, outputting a low air pressure signal of the parking loop.

And if the air pressure value of the suspension loop is higher than the lower limit value of the normal pressure of the suspension loop and is not higher than the upper limit value of the normal pressure of the suspension loop, outputting an air pressure normal signal.

And if the air pressure value of the parking loop is higher than the upper limit value of the normal pressure of the parking loop and is not higher than the service brake high-pressure alarm threshold, outputting a signal that the air pressure of the parking loop is higher.

If the air pressure value of the parking loop is higher than the service brake high-pressure alarm threshold value, an air pressure overhigh signal is output.

S500, respectively comparing the front loop air pressure value and the rear loop air pressure value with a service brake high-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the front loop is higher than the service brake high-pressure alarm threshold value, or the air pressure value of the rear loop is higher than the service brake high-pressure alarm threshold value, comparing the air pressure value of the parking loop with the service brake low-pressure alarm threshold value, and performing the following operations according to the comparison result:

if the air pressure value of the parking loop is not higher than the service brake low-pressure alarm threshold value, an air pressure too low signal is output.

If the air pressure value of the parking loop is higher than the service brake low-pressure alarm threshold value, an air pressure overhigh signal is output.

S600, according to the output result of each step from S100 to S500, the following operations are carried out:

if the output result is a normal air pressure signal, the vehicle-mounted display screen does not display.

If the output result is an air pressure over-low signal, displaying the air pressure over-low signal on the vehicle-mounted display screen, and not receiving the output result until manual reset; otherwise, updating the display output result on the vehicle-mounted display screen in real time according to the acquisition frequency.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.