New energy commercial vehicle air compressor redundancy control system and method

Abstract

The invention relates to the technical field of new energy commercial vehicles, in particular to a new energy commercial vehicle air compressor redundancy control system and method.The new energy commercial vehicle air compressor redundancy control system comprises a VCU used for synchronously receiving two paths of air pressure value signals, and the VCU controls starting and stopping of an inflation pump through the two paths of air pressure value signals and a drying tank pressure switch hard wire signal; a control scheme that a VCU controls an inflating pump through an air pressure value is adopted, a drying tank outputs a pressure switch hard wire signal at the same time to be connected to the VCU, and after the air pressure reaches a target value, the inflating pump continuously works for a period of time and then is closed, so that the redundancy control requirement for the inflating pump is met; 1) the problem of long-time inflation after the switch of the market vehicle drying tank fails is solved; and the problems of air pressure deviation and the like caused by difference of exhaust threshold values of different drying tanks and air path assembly are solved, and software engineering application is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy commercial vehicles, in particular to a new energy commercial vehicle air compressor redundancy control system and method. BACKGROUND

[0002] At present, new energy commercial vehicles adopt air pressure braking, and the air pump control system mainly includes VCU, EHBS, air pump, drying tank and other parts.

[0003] The VCU controls the start and stop of the air pump through the gas cylinder pressure value and the hard-wired signal of the drying tank pressure switch.

[0004] Because the exhaust corresponding pressure values of different air pump control systems are different, and the hard-wired signal of the drying tank pressure switch is easy to fail, this control mode is prone to the problem of long working of the air pump, which increases power consumption and reduces the service life of the air pump. SUMMARY

[0005] In view of the problems existing in the prior art, the purpose of the present application is to provide a new energy commercial vehicle air compressor redundancy control system and method.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a new energy commercial vehicle air compressor redundancy control system, comprising a VCU for synchronously receiving two air pressure value signals, the VCU controls the start and stop of the air pump through the two air pressure value signals and the hard-wired signal of the drying tank pressure switch.

[0007] Preferably, the control system is also provided with a drying tank and an air pump, and the air pump is controlled by the EHBS.

[0008] A new energy commercial vehicle air compressor redundancy control method, comprising the following steps:

[0009] 1) The VCU receives two air pressure value signals of the vehicle braking system, and judges whether the air pressure value signal is valid;

[0010] 2) If the air pressure value signal is invalid, the start and stop of the air pump is controlled by the drying tank pressure switch;

[0011] 3) If the air pressure value signal is valid, the two air pressure value signals of the braking system and the drying tank pressure switch are judged at the same time, and the start and stop of the air pump is controlled.

[0012] Preferably, the way of judging whether the air pressure value signal is valid in the step 1) is that when the drying tank pressure switch is not invalid, the air pump is controlled to start and stop by the air pressure value, when the air pressure value is lower than the set limit value, the air pump is controlled to start working, and when the air pressure value reaches the set target value, the air pump is continuously controlled to work for 1 min; when the drying tank pressure switch is invalid, the air pump is controlled to be closed, or the air pump is controlled to be closed after the time reaches.

[0013] The present application has the following beneficial effects:

[0014] 1) The present application solves the problem of long inflation after the market vehicle drying tank switch fails;

[0015] 2) Adapt to different drying tank exhaust threshold differences and air pressure deviation caused by air path assembly problems, realize software engineering application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the principle diagram of the redundancy control system of the inflation pump.

[0017] Figure 2 is the flow chart of the redundancy control method of the inflation pump.

[0018] In the figure: 1-VCU; 2-EHBS; 3-inflation pump; 4-drying tank; 5-vehicle air path. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be further described in detail below with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0020] Key term definition:

[0021] VCU: vehicle controller;

[0022] EHBS: electrically driven brake system.

[0023] A redundancy control system of a new energy commercial vehicle air compressor, comprising VCU1, EHBS2, inflation pump3, drying tank4 and vehicle air path5, wherein VCU1 synchronously receives two-way air pressure value signals, and the drying tank pressure switch hard-wire signal on the drying tank4 is connected to VCU1.

[0024] A redundancy control method of a new energy commercial vehicle air compressor, first receiving two-way air pressure values of the vehicle braking system by VCU1, judging whether the air pressure value signal is valid; if the signal is invalid, only the drying tank pressure switch is used to control the start and stop of the inflation pump3; if the signal is valid, the two-way air pressure values of the braking system and the drying tank pressure switch are jointly used to control the start and stop of the inflation pump3.

[0025] When the air pressure value is lower than the set limit value, the control air pump 3 starts to work, and when the air pressure value reaches the set target value, the control air pump 3 continues to work for 1 min (the time should be set as a calibration amount, which is convenient for subsequent adjustment), and when the time reaches, the control air pump 3 is closed. The logic guarantees the engineering application of the control system of the air pump 3. The pressure points of the dry tank exhaust of the real vehicle assembly are different. If only a fixed set target value is controlled, when the dry tank 4 exhausts above the set value, the control function is normal; when the dry tank 4 exhausts below the set value, the air pump 3 works for a long time. Therefore, the addition of the air pump working delay can guarantee the engineering application prospect of the air pump control system.

[0026] The dry tank pressure switch is judged, and if the pressure switch is valid, the control air pump 3 starts to work, and when the pressure switch is invalid, the control air pump is closed. When the dry tank pressure switch fails, the air pump 3 works for a long time. The logic and the above-mentioned logic combination complete the redundancy control scheme of the air pump. When the air reaches the corresponding air pressure target value, if the dry tank exhausts in a short time, the dry tank pressure switch is invalid, the air pump 3 is closed, and there is no need to complete the specified remaining delay time, which reduces the power consumption and avoids the invalid work of the air pump 3. When the dry tank pressure switch fails, the air pump 3 starts to work, and when the corresponding air pressure value reaches the set target value, the air pump can still be normally closed after a delay, which will not affect the service life of the air pump. When the air pressure value signal is invalid, the dry tank pressure switch state is judged to control the air pump 3 to start and stop.

[0027] Embodiment: There is a market problem of long working of the air pump in the vehicle produced by a certain vehicle enterprise. Through on-site investigation, it is found that the problem is caused by the air pump control scheme used by the vehicle: when the air pressure value is less than the set limit value, the control air pump 3 works, and when the air pressure value reaches the set target value, the control air pump 3 is closed; the dry tank pressure switch is valid, the control air pump 3 works, and when the dry tank pressure switch is invalid, the control air pump 3 is closed. Since the dry tank pressure switch is a hard-wired signal, the hard-wired signal is easy to fail when the vehicle running time increases and the running environment is poor. When the dry tank pressure switch signal fails, the air pump 3 works for a long time.

[0028] After the new energy commercial vehicle air pump redundancy control system and method are adopted, when the dry tank pressure switch is not invalid, the air pump 3 is controlled to work and stop through the real vehicle air pressure value. When the air pressure value is lower than the set limit value, the control air pump 3 starts to work, and when the air pressure value reaches the set target value, the control air pump 3 continues to work for 1 min, and when the dry tank pressure switch signal is invalid in this time, the control air pump 3 is closed, or when the time reaches, the control air pump 3 is closed; when the dry tank pressure switch fails, the air pump 3 can still be controlled to work and stop through the real vehicle air pressure value.

[0029] The application solves the problem that the service life of the inflating pump is reduced due to long work after the failure of the drying tank pressure switch; meanwhile, by introducing a set of state detection method, the difference of the exhaust threshold of different drying tanks and the pressure difference caused by the gas path assembly can be adapted, and the engineering application of the whole system is realized.

[0030] The application is not limited to the above-mentioned embodiments, and any person should know that the structural changes made under the inspiration of the application fall within the protection scope of the application, and any technical solutions with the same or similar technical solutions as the application fall within the protection scope of the application.

[0031] The technical, shape and structure parts not described in detail in the application are all known technologies.

Claims

1. A new energy commercial vehicle air compressor redundancy control system, characterized in that, The VCU is used to synchronize receiving two air pressure value signals, and controls the start and stop of the air pump through the two air pressure value signals and the hard-wired signal of the drying tank pressure switch.

2. The new energy commercial vehicle air compressor redundancy control system according to claim 1, characterized in that, The control system is also provided with a drying tank and an air pump, and the air pump is controlled by the EHBS.

3. A new energy commercial vehicle air compressor redundancy control method, comprising the following steps: 1) The VCU receives two air pressure value signals of the vehicle braking system, and judges whether the air pressure value signals are valid; 2) If the air pressure value signals are invalid, the air pump is controlled to start and stop through the drying tank pressure switch; 3) If the air pressure value signals are valid, the two air pressure value signals of the braking system and the drying tank pressure switch are simultaneously judged, and the air pump is controlled to start and stop.

4. The new energy commercial vehicle air compressor redundancy control method according to claim 3, characterized in that, In the step 1), the way to judge whether the air pressure value signals are valid is that when the drying tank pressure switch is not invalid, the air pump is controlled to start and stop through the air pressure value, and when the air pressure value is lower than the set limit value, the air pump is controlled to start working, and when the air pressure value reaches the set target value, the air pump is continuously controlled to work for 1 min; when the drying tank pressure switch is invalid, the air pump is controlled to be closed, or the air pump is controlled to be closed after the time reaches.

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