CN103603735A - CNG (compressed natural gas) automobile fuel gas supply monitoring system and CNG automobile fuel gas supply monitoring method - Google Patents
CNG (compressed natural gas) automobile fuel gas supply monitoring system and CNG automobile fuel gas supply monitoring method Download PDFInfo
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- CN103603735A CN103603735A CN201310573863.3A CN201310573863A CN103603735A CN 103603735 A CN103603735 A CN 103603735A CN 201310573863 A CN201310573863 A CN 201310573863A CN 103603735 A CN103603735 A CN 103603735A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
An embodiment of the invention discloses a CNG (compressed natural gas) automobile fuel gas supply monitoring system and a CNG automobile fuel gas supply monitoring method. The system comprises a leakage sensor, a whole automobile electronic control unit, a first switch and a second switch, wherein the second switch comprises a first output end and a second output end; the first output end is connected with a gasoline nozzle; and the second output end is connected with a fuel gas nozzle of a fuel gas supply system. By using the system, the concentration of fuel gas surrounding the fuel gas supply system is not greater than a preset value in the whole automobile electronic control unit; when a CNG automobile meets a gas using condition, the second switch is controlled to be switched to the second output end, and fuel gas serves as the fuel of the automobile; when the CNG automobile does not meet the gas using condition, the second switch is controlled to be switched to the first output end, gasoline serves as the fuel of the automobile, so that the fuel gas supply system of the CNG automobile is monitored in real time, the fuel gas supply is cut off timely when fuel gas of the fuel gas supply system of the CNG automobile leaks, and the safety protection performance of the CNG automobile is improved.
Description
Technical field
The present invention relates to CNG automobile technical field, relate in particular to a kind of CNG automobile fuel gas supplying monitoring system and method.
Background technique
CNG(Compressed Natural Gas) automobile refers to that usining compressed natural gas substitutes regular price gasoline or diesel oil as the automobile of automotive fuel.
As shown in Figure 1, the gas supply system in current CNG automobile generally comprises: gas cylinder 1, stores rock gas in described gas cylinder 1; The cylinder valve 3 being connected with described gas cylinder 1 by high-voltage tube 2; The gas charging valve 5 being connected with described cylinder valve 3 by high-voltage tube 4; The decompressor 6 being connected with described gas charging valve 5 by high-voltage tube; The filter 8 being connected with described decompressor 6 by low-voltage tube 7; The gas rail pressure sensor 10 being connected with described filter 8 by low-voltage tube 9; The gas nozzle 11 being connected with described gas rail pressure sensor 10 by low-voltage tube.Wherein, described cylinder valve 3 is controlled it by Twoway valves controller and is opened and closed, and described decompressor 6 is by its switching of decompressor electromagnetic valve.
When described CNG automobile uses rock gas as automotive fuel, described cylinder valve 3 is opened, and the rock gas in described gas cylinder 1 passes through gas charging valve 5, the gentle rail pressure sensor 10 of decompressor 6 successively, from described gas nozzle 11 ejections, offer described CNG automobile, as automotive fuel.
But CNG, as the hazardous gas of a kind of easy firing, blast, when offering convenience to traffic, has also increased the danger of CNG automobile.Therefore, how to monitor CNG automobile fuel gas supply system, and when gas leakage appears in described gas supply system, cut off in time fuel gas supply, prevent the generation of the accidents such as automobile burning, blast, become the research emphasis of CNG automobile safety protective.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present invention provides a kind of CNG automobile fuel gas supplying monitoring system and method, to realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent the generation of the accidents such as automobile burning, blast, improve the security protection performance of described CNG automobile.
For achieving the above object, the embodiment of the present invention provides following technological scheme:
A CNG automobile fuel gas supplying monitoring system, described CNG automobile comprises: power supply, oil-gas switch switch, petrol jet and gas supply system, described supervisory system comprises:
To the described gas supply system leak sensor that around gas concentration carries out real-time detection, and described leak sensor is connected with described power supply;
The finished vehicle electronic control unit being connected with described leak sensor, and described finished vehicle electronic control unit is connected with described gas supply system;
The first switch and second switch that control end is all connected with described finished vehicle electronic control unit, described second switch comprises the first output terminal and the second output terminal;
Wherein, the input end of described the first switch is connected with power supply, and output terminal is connected with input end, the gas supply system of second switch; The first output terminal of described second switch is connected with petrol jet, and the second output terminal is connected with the gas nozzle of described gas supply system;
The in the situation that of described the first switch closure, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
Preferably, described leak sensor be arranged in described gas supply system high-voltage tube between gas cylinder and cylinder valve directly over.
Preferably, described finished vehicle electronic control unit is connected and comprises with described gas supply system:
Described finished vehicle electronic control unit is connected with the gas rail pressure sensor in described gas supply system;
Described finished vehicle electronic control unit is connected with the Twoway valves controller in described gas supply system;
Described finished vehicle electronic control unit is connected with the decompressor solenoid valve in described gas supply system;
Described finished vehicle electronic control unit is connected with the gas nozzle in described gas supply system.
Preferably, described decompressor solenoid valve is connected with described finished vehicle electronic control unit by the 3rd switch, and wherein, the control end of described the 3rd switch is connected with described finished vehicle electronic control unit, input end is connected with described power supply, and output terminal is connected with described decompressor solenoid valve.
Preferably, described the first switch is the first relay, and described second switch is the second relay, and described the 3rd switch is the 3rd relay.
Preferably, described CNG automobile is satisfied comprises by gas condition:
Described finished vehicle electronic control unit receives that described oil-gas switch switch sends uses gas demand signal;
The engine water temperature that described finished vehicle electronic control unit detects described CNG automobile is greater than preset temperature;
The engine speed that described finished vehicle electronic control unit detects described CNG automobile is greater than preset rotation speed.
Preferably, described supervisory system also comprises: the warning device being connected with described finished vehicle electronic control unit.
Preferably, described warning device is beacon or buzzer.
A CNG automobile fuel gas supplying monitoring method, is applied to the CNG automobile fuel gas supplying monitoring system described in above-mentioned any one, comprising:
Judge whether gas supply system gas concentration around surpasses predefined value;
Judge whether described CNG automobile meets the gas condition of using;
When described gas supply system gas concentration around does not surpass predefined value, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
Preferably, described CNG automobile is satisfied comprises by gas condition:
Described finished vehicle electronic control unit receives that described oil-gas switch switch sends uses gas demand signal;
The engine water temperature that described finished vehicle electronic control unit detects described CNG automobile is greater than preset temperature;
The engine speed that described finished vehicle electronic control unit detects described CNG automobile is greater than preset rotation speed.
Preferably, also comprise: when described gas supply system gas concentration around surpasses predefined value, report to the police.
Compared with prior art, technique scheme has the following advantages:
The technological scheme that the embodiment of the present invention provides, comprising: leak sensor, and finished vehicle electronic control unit, the first switch and second switch that control end is all connected with described finished vehicle electronic control unit, described second switch comprises the first output terminal and the second output terminal; Wherein, the input end of described the first switch is connected with power supply, and output terminal is connected with input end, the gas supply system of second switch; The first output terminal of described second switch is connected with petrol jet, the second output terminal is connected with the gas nozzle of described gas supply system, thereby the in the situation that of described the first switch closure, utilize described leak sensor to detect described gas supply system gas concentration around.The concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, use combustion gas as automotive fuel, otherwise, described car load control unit is controlled described second switch and is switched to the first output terminal, use gasoline as automotive fuel, with this, realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent automobile burning, the generation of the accidents such as blast, improve the security protection performance of described CNG automobile.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of CNG automobile fuel gas supply system in prior art;
The structural representation of the CNG automobile fuel gas supplying monitoring system that Fig. 2 provides for the embodiment of the present invention;
The schematic flow sheet of the CNG automobile fuel gas supplying monitoring method that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Just as described in the background section, how to monitor CNG automobile fuel gas supply system, and when gas leakage appears in described gas supply system, cut off in time fuel gas supply, prevent the generation of the accidents such as automobile burning, blast, become the research emphasis of CNG automobile safety protective.
In view of this, the embodiment of the present invention provides a kind of CNG automobile fuel gas supplying monitoring system, and described CNG automobile comprises: power supply, oil-gas switch switch, petrol jet and gas supply system, and described supervisory system comprises:
To the described gas supply system leak sensor that around gas concentration carries out real-time detection, and described leak sensor is connected with described power supply;
The finished vehicle electronic control unit being connected with described leak sensor, and described finished vehicle electronic control unit is connected with described gas supply system;
The first switch and second switch that control end is all connected with described finished vehicle electronic control unit, described second switch comprises the first output terminal and the second output terminal;
Wherein, the input end of described the first switch is connected with power supply, and output terminal is connected with input end, the gas supply system of second switch; The first output terminal of described second switch is connected with petrol jet, and the second output terminal is connected with the gas nozzle of described gas supply system;
The in the situation that of described the first switch closure, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
Accordingly, the embodiment of the present invention also provides a kind of CNG automobile fuel gas supplying monitoring method, is applied to above-mentioned CNG automobile fuel gas supplying monitoring system, comprising:
Judge whether gas supply system gas concentration around surpasses predefined value;
Judge whether described CNG automobile meets the gas condition of using;
When described gas supply system gas concentration around does not surpass predefined value, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
The technological scheme that the embodiment of the present invention provides, can be the in the situation that of described the first switch closure, utilize described leak sensor to detect described gas supply system gas concentration around, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, use combustion gas as automotive fuel, otherwise, described car load control unit is controlled described second switch and is switched to the first output terminal, use gasoline as automotive fuel, with this, realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent automobile burning, the generation of the accidents such as blast, improve the security protection performance of described CNG automobile.
For above-mentioned purpose of the present invention, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that.Therefore the present invention is not subject to the restriction of following public concrete enforcement.
As shown in Figure 2, the embodiment of the present invention provides a kind of CNG automobile fuel gas supplying monitoring system, described CNG automobile comprises: power supply, oil-gas switch switch, petrol jet and gas supply system, described supervisory system comprises: the first switch and second switch that leak sensor, finished vehicle electronic control unit, control end are all connected with described finished vehicle electronic control unit.
Wherein, described leak sensor is arranged at around described gas supply system, for described gas supply system gas concentration is around detected, and the gas supply system detecting gas concentration is around converted to voltage signal exports to finished vehicle electronic control unit.
In described gas supply system, gas cylinder, cylinder valve and the high-voltage tube that connects described gas cylinder and cylinder valve are arranged on automobile trunk, belong to region sluggish in air circulation, therefore, in one embodiment of the invention, described leak sensor is preferably arranged in automobile trunk, and be positioned at described gas cylinder, cylinder valve and connect described gas cylinder and cylinder valve high-voltage tube directly over so that the gas leakage situation of described gas supply system is monitored.
It should be noted that, in embodiments of the present invention, described leak sensor is also connected with power supply, thereby utilizes described power supply for described leak sensor provides voltage signal, guarantees that described leak sensor carries out Real-Time Monitoring to described gas supply system.
On described finished vehicle electronic control unit, be provided with leak sensor signal input part (pin a3), fuel gas supply signal output part, wherein, described leak sensor signal input part (pin a3) is connected with the output terminal of described leak sensor, described fuel gas supply signal output part is connected with gas supply system, thereby according to the voltage signal of described leak sensor output, around judging described gas supply system, whether gas concentration surpasses predefined value, when around described gas supply system, gas concentration surpasses predefined value, by described fuel gas supply signal output part, control described gas supply system and cut off fuel gas supply, make described CNG automobile utilize gasoline as fuel.
On described finished vehicle electronic control unit, be also provided with the first switching signal output terminal (pin b2), second switch signal output part (pin c1) and voltage signal input end (pin b1), wherein, described the first switching signal output terminal (pin b2) is connected with the control end of the first switch, described second switch signal output part (pin c1) is connected with the control end of described second switch, described voltage signal input end (pin b1) is connected with power supply, for described finished vehicle electronic control unit provides operating voltage.And the input end of described the first switch is connected with power supply, output terminal is connected with input end and the gas supply system of described second switch; Described second switch comprises the first output terminal and the second output terminal, and described the first output terminal is connected with petrol jet, and the second output terminal is connected with the gas nozzle of described gas supply system.
In addition on described finished vehicle electronic control unit, be also provided with: the oil gas signal input part being connected with oil-gas switch switch, the petrol jet signal output part being connected with petrol jet (pin b3), key signal input part (pin c4), engine rotational speed signal input end (pin c3) and engine water temperature signal input part (pin c2).
Wherein, described oil gas signal input part comprises: with oily demand signal input end (pin d3) with gas demand signal input end (pin d2), when described oil-gas switch switching over is extremely used oil condition, described oil-gas switch switch is used oily demand signal by the oily demand signal input end of described use (pin d3) to one of described finished vehicle electronic control unit input, when described oil-gas switch switching over is extremely used gaseity, described oil-gas switch switch is by the described gas demand signal input end (pin d2) of using, to one of described finished vehicle electronic control unit input, use gas demand signal.
Described key signal input part (pin c4) is connected with automobile key, for receiving the input signal of automobile key.Described engine rotational speed signal input end (pin c3) is connected with described engine rotation speed sensor, for detecting in real time the rotating speed of motor, described engine water temperature signal input part (pin c2) is connected with described engine water temperature sensor, for detecting in real time the water temperature of motor.
It should be noted that, the input signal of CNG automobile key generally includes: ON signal, START signal and OFF signal.When the key signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit is OFF signal, described finished vehicle electronic control unit is not worked, and described CNG automobile is in starting state not, when the signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit is ON signal, described finished vehicle electronic control unit is by described the first switching signal output terminal (pin b2), control described the first switch closed, be communicated with the path between described power supply and gas supply system, finished vehicle electronic control unit, second switch, utilize described power supply for described gas supply system, finished vehicle electronic control unit and second switch provide operating voltage, make described CNG automobile in treating starting state, when the key signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit is START signal, it is closed that described finished vehicle electronic control unit is controlled described second switch, be communicated with described finished vehicle electronic control unit, gas nozzle in petrol jet or described gas supply system, path between second switch and power supply, utilize described petrol jet to provide fuel for described CNG automobile, or utilize gas nozzle in described gas supply system to provide fuel for described CNG automobile, ensure that described CNG automobile is in starting state, it is travelling state.
Concrete, when the signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit is ON signal, described finished vehicle electronic control unit is by described the first switching signal output terminal (pin b2), control described the first switch closed, be communicated with the path between described power supply and gas supply system, finished vehicle electronic control unit, second switch, utilize described power supply for described gas supply system, finished vehicle electronic control unit and second switch provide operating voltage, make described CNG automobile in treating starting state.
Then, the voltage signal that described finished vehicle electronic control unit receives according to described leak sensor signal input part (pin a3), judges whether described gas supply system gas concentration around surpasses predefined value.
When described gas supply system gas concentration around surpasses predefined value, whether no matter described finished vehicle electronic control unit detects described CNG automobile meets the gas condition of using, described finished vehicle electronic control unit is all by described second switch signal output part (pin c1), control described second switch and switch to the first output terminal, be communicated with the path between described power supply, petrol jet and finished vehicle electronic control unit, utilize described petrol jet to provide fuel for described CNG automobile.
When described gas supply system gas concentration around does not surpass predefined value, utilize described finished vehicle electronic control unit to judge whether described CNG automobile meets the gas condition of using.If detecting described CNG automobile, described finished vehicle electronic control unit do not meet the gas condition of using, described finished vehicle electronic control unit is by described second switch signal output part (pin c1), control described second switch and switch to the first output terminal, be communicated with the path between described power supply, petrol jet and finished vehicle electronic control unit, utilize described petrol jet to provide fuel for described CNG automobile.If detecting described CNG automobile, described finished vehicle electronic control unit meets the gas condition of using, described finished vehicle electronic control unit is by described second switch signal output part (pin c1), control described second switch and switch to the second output terminal, be communicated with the path between described power supply, gas nozzle and finished vehicle electronic control unit, utilize gas nozzle in described gas supply system to provide fuel for described CNG automobile.
As from the foregoing, only the in the situation that of described the first switch closure, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is just controlled described second switch and is switched to the second output terminal, utilize gas nozzle to provide fuel for described CNG automobile, otherwise, described car load control unit is all controlled described second switch and is switched to the first output terminal, utilizes petrol jet to provide fuel for described CNG automobile.
In one embodiment of the invention, described CNG automobile meets and to comprise by gas condition: described finished vehicle electronic control unit receives described oil-gas switch switch and sends and use gas demand signal; The engine water temperature that described finished vehicle electronic control unit detects described CNG automobile is greater than preset temperature; The engine speed that described finished vehicle electronic control unit detects described CNG automobile is greater than preset rotation speed.
In this embodiment, first, the signal that described finished vehicle electronic control unit sends described oil-gas switch switch by oil gas signal input part judges, when described oil gas signal input part receives signal that described oil-gas switch switch sends when with gas demand signal, described finished vehicle electronic control unit detects the water temperature of described motor by described engine water temperature signal input part (pin c2), when the water temperature signal of the motor receiving when described engine water temperature signal input part (pin c2) is greater than preset temperature, described finished vehicle electronic control unit detects the rotating speed of described motor by described engine rotational speed signal input end (pin c3), when the engine rotational speed signal receiving when described engine rotational speed signal input end (pin c3) is greater than preset rotation speed, described CNG automobile meets the gas condition of using.; only having described finished vehicle electronic control unit to receive described oil-gas switch switch sends when being greater than engine speed that preset temperature and described finished vehicle electronic control unit detect described CNG automobile and being greater than three conditions of preset rotation speed and all meeting with the engine water temperature that gas demand signal, described finished vehicle electronic control unit detect described CNG automobile; described CNG automobile just meets and uses gas condition, otherwise described CNG automobile does not meet the gas condition of using.
In one embodiment of the invention, described finished vehicle electronic control unit is connected and comprises with described gas supply system: described finished vehicle electronic control unit is connected with the gas rail pressure sensor in described gas supply system; Described finished vehicle electronic control unit is connected with the Twoway valves controller in described gas supply system; Described finished vehicle electronic control unit is connected with the decompressor solenoid valve in described gas supply system; Described finished vehicle electronic control unit is connected with the gas nozzle in described gas supply system.
In this embodiment, on described finished vehicle electronic control unit, be provided with: gas rail pressure sensor signal input end (pin a1), gas rail pressure sensor signal output terminal (pin d4), Twoway valves controller signals output terminal (pin a2), decompressor solenoid valve signal output part (pin a4) and gas nozzle signal output part (pin b4).
The concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is first by described Twoway valves controller signals output terminal (pin a2), the cylinder valve that utilizes described Twoway valves controller to control in described gas supply system is opened, and provide operating voltage by described gas rail pressure sensor signal output terminal (pin d4) for described gas rail pressure sensor, then, by described decompressor solenoid valve signal output part (pin a4), utilize decompressor described in described decompressor electromagnetic valve to open, finally, by described gas rail pressure sensor signal input end (pin a1), receive the output voltage signal of described gas rail pressure sensor, and when the output voltage signal of described gas rail pressure sensor is normal, control second switch and switch to the second output terminal, then by described gas nozzle signal output part (pin b4), control described gas nozzle and provide fuel for described CNG automobile.
In another embodiment of the present invention, described decompressor solenoid valve is connected with described finished vehicle electronic control unit by the 3rd switch, wherein, the control end of described the 3rd switch is connected with described finished vehicle electronic control unit, input end is connected with described power supply, and output terminal is connected with described decompressor solenoid valve.In this embodiment, when stating finished vehicle electronic control unit, utilize described in described Twoway valves controller opens after cylinder valve, again judge whether the signal that described leak sensor signal input part (pin a3) receives is greater than the predefined value in described finished vehicle electronic control unit, when the signal receiving when described leak sensor signal input part (pin a3) is not more than the predefined value in described finished vehicle electronic control unit, it is closed that described finished vehicle electronic control unit is controlled described the 3rd switch by decompressor solenoid valve signal output part (pin a4), be communicated with described decompressor solenoid valve, path between the 3rd switch and finished vehicle electronic control unit, realization utilizes described decompressor solenoid valve to open decompressor.
It should be noted that, in the process of described CNG automobile running, described leak sensor is carried out Real-Time Monitoring to described gas supply system gas concentration around, and converts thereof into voltage signal and export to finished vehicle electronic control unit.When the signal receiving when the leak sensor signal input part of described finished vehicle electronic control unit is greater than the predefined value in described finished vehicle electronic control unit, described finished vehicle electronic control unit is controlled at once described second switch and is switched to the first output terminal, and described CNG automobile switches to oil work.
In a preferred embodiment of the invention, described the first switch is the first relay, described second switch is the second relay, described the 3rd switch is the 3rd relay, but the present invention does not limit this, in other embodiments of the invention, described the first switch, second switch and the 3rd switch also can, for other constructions of switch, be determined on a case-by-case basis.
In yet another embodiment of the present invention, described supervisory system also comprises: the warning device being connected with described finished vehicle electronic control unit.In this embodiment, on described finished vehicle electronic control unit, be also provided with gas leakage alarm signal output part (pin d1), when described finished vehicle electronic control unit is by described leak sensor, while described gas supply system gas concentration around being detected over predefined value, described finished vehicle electronic control unit is by gas leakage alarm signal output part (pin d1), for described warning device provides voltage signal, described warning device starts to report to the police.
It should be noted that, described warning device can be beacon, can be also buzzer, can also be other warning devices, and the present invention does not limit this, is determined on a case-by-case basis.
Below in conjunction with specific embodiment, the working procedure of CNG automobile fuel gas supplying monitoring system provided by the present invention is described.In this embodiment, described supply voltage is 12V, described finished vehicle electronic control unit for the operating voltage that described gas rail pressure sensor provides be 5V, the voltage signal that described finished vehicle electronic control unit provides for described warning device is also 5V, predefined value in described finished vehicle electronic control unit is 3V, described default water temperature is 50 ℃, and described preset rotation speed is 1500 revs/min, and described finished vehicle electronic control unit is car load ECU.
When the signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit is ON signal, described leak sensor sends voltage signal to described finished vehicle electronic control unit, when the voltage signal receiving by described leak sensor signal input part (pin a3) when described finished vehicle electronic control unit is 0-3V, illustrate that described gas supply system gas concentration is around in safety range, without leakage alarms, described warning device is not worked.When the voltage signal receiving by described leak sensor signal input part (pin a3) when described finished vehicle electronic control unit is 3V-5V, illustrate that described gas supply system gas concentration is not around in safety range, described finished vehicle electronic control unit sends leakage alarm signal by described leakage alarm signal output part (pin d1), and described warning device starts to report to the police.
When the signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit has just switched to START signal by ON signal, because the engine speed of described CNG automobile is zero, no matter have or not leakage alarm, the input end that described finished vehicle electronic control unit is all controlled described second switch signal is communicated with the first output terminal, described petrol jet work, described CNG automotive ignition starts.
The signal receiving when the key signal input part (pin c4) of described finished vehicle electronic control unit switches to after START signal, be after described CNG automotive ignition has started, when described finished vehicle electronic control unit receives with gas demand signal, (be the use gas demand signal input end (pin d2) of described finished vehicle electronic control unit, receive the 12V voltage signal that described oil-gas switch switch sends) time, first utilize described finished vehicle electronic control unit judgement to have or not leakage alarm, if any leakage alarm, maintain petrol jet work.
As there is no a leakage alarm, utilize described finished vehicle electronic control unit to judge whether described engine water temperature meets the condition of 50 ℃ that is greater than, if met, whether the rotating speed that continues to utilize described finished vehicle electronic control unit to judge described motor meets the condition of 1500 revs/min that is greater than, if met, utilizing described finished vehicle electronic control unit to control cylinder valve by described Twoway valves controller opens, and open by decompressor electromagnetic valve decompressor, then receive the voltage signal that described gas rail pressure sensor sends, and the voltage signal sending when described gas rail pressure sensor is when normal (as 4V-5V), controlling described second switch switches to input end and is communicated with the second output terminal, described gas nozzle work.
When switching to, described CNG automobile utilizes after gas nozzle work, in the process of described CNG automobile running, utilize described leak sensor to carry out Real-Time Monitoring to described gas supply system gas concentration around, and convert thereof into voltage signal and export to finished vehicle electronic control unit.When the signal receiving when the leak sensor signal input part of described finished vehicle electronic control unit is greater than the predefined value in described finished vehicle electronic control unit, described finished vehicle electronic control unit is controlled at once described second switch and is switched to the first output terminal, and described CNG automobile switches to oil work.
As can be seen here, the CNG automobile fuel gas supplying monitoring system that the embodiment of the present invention provides can be the in the situation that of described the first switch closure, utilize described leak sensor to detect described gas supply system gas concentration around, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, use combustion gas as automotive fuel, otherwise, described car load control unit is controlled described second switch and is switched to the first output terminal, use gasoline as automotive fuel, with this, realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent automobile burning, the generation of the accidents such as blast, improve the security protection performance of described CNG automobile.
Accordingly, the embodiment of the present invention also provides a kind of CNG automobile fuel gas supplying monitoring method, is applied to the CNG automobile fuel gas supplying monitoring system described in above-mentioned arbitrary embodiment, as shown in Figure 3, comprising:
When described CNG automobile is when until starting state, be that described CNG automobile key is in ON state, described the first switch is closed, judges that whether gas supply system gas concentration around surpasses predefined value, has or not leakage alarm, when if described gas supply system gas concentration around surpasses predefined value, have leakage alarm, warning device work, if when described gas supply system gas concentration around does not surpass predefined value, without leakage alarm, warning device is not worked.
When described CNG automobile is in by when starting state switches to starting state, when described CNG automobile key switches to START state by ON state, described CNG gasoline work.
When described CNG automobile is during in starting state, described CNG automobile key is in START state, and described gas supply system gas concentration is not around while surpassing predefined value (without leakage alarm), judges whether described CNG automobile meets the gas condition of using.
When described CNG automobile meets by gas condition, open the cylinder valve in described gas supply system.
In one embodiment of the invention, described CNG automobile is satisfied comprises by gas condition: receive the gas request of using; The engine water temperature of described CNG automobile is greater than preset temperature; The engine speed of described CNG automobile is greater than preset rotation speed.Concrete, when without leakage alarm, first judge whether to receive the gas request of using; When receiving with gas request, judge whether the engine water temperature of described CNG automobile is greater than preset temperature; When the engine water temperature of described CNG automobile is greater than preset temperature, judge whether the engine speed of described CNG automobile is greater than preset rotation speed.When the engine speed of described CNG automobile is greater than preset rotation speed, start described gas supply system, open the cylinder valve in described gas supply system.
Cylinder valve in opening described gas supply system, judges whether gas supply system gas concentration around surpasses predefined value again.If described gas supply system gas concentration does not around surpass predefined value yet, open the decompressor in described gas supply system, otherwise close cylinder valve, described CNG gasoline work.
Open after the decompressor in described gas supply system, judge that whether the voltage of the gas rail pressure sensor in described gas supply system is normal.If the voltage of the gas rail pressure sensor in described gas supply system is normal, control described second switch and switch to the second output terminal, described CNG automobile use gas work, otherwise, described CNG gasoline work.
It should be noted that, in the process of described CNG automobile running, need to carry out Real-Time Monitoring to described gas supply system gas concentration around, when described gas supply system gas concentration around surpasses predefined value, control at once described second switch and switch to the first output terminal, described CNG gasoline work.
As can be seen here, the CNG automobile fuel gas supplying monitoring method that the embodiment of the present invention provides can Real-Time Monitoring described in gas supply system gas concentration around, only have the concentration when the combustion gas around of described gas supply system to be not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, use combustion gas as automotive fuel, otherwise, described car load control unit is controlled described second switch and is switched to the first output terminal, use gasoline as automotive fuel, with this, realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent automobile burning, the generation of the accidents such as blast, improve the security protection performance of described CNG automobile.
In sum, the CNG automobile fuel gas supplying monitoring system and method that the embodiment of the present invention provides, can realize the real-time monitoring to described CNG automobile fuel gas supply system, and when there is gas leakage in described CNG automobile fuel gas supply system, cut off in time fuel gas supply, prevent the generation of the accidents such as automobile burning, blast, improve the security protection performance of described CNG automobile.
In this specification, various piece adopts the mode go forward one by one to describe, and each part stresses is the difference with other parts, between various piece identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To these embodiments' multiple modification, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. a CNG automobile fuel gas supplying monitoring system, described CNG automobile comprises: power supply, oil-gas switch switch, petrol jet and gas supply system, it is characterized in that, described supervisory system comprises:
To the described gas supply system leak sensor that around gas concentration carries out real-time detection, and described leak sensor is connected with described power supply;
The finished vehicle electronic control unit being connected with described leak sensor, and described finished vehicle electronic control unit is connected with described gas supply system;
The first switch and second switch that control end is all connected with described finished vehicle electronic control unit, described second switch comprises the first output terminal and the second output terminal;
Wherein, the input end of described the first switch is connected with power supply, and output terminal is connected with input end, the gas supply system of second switch; The first output terminal of described second switch is connected with petrol jet, and the second output terminal is connected with the gas nozzle of described gas supply system;
The in the situation that of described the first switch closure, the concentration that the combustion gas around of described gas supply system detected when described leak sensor is not more than the predefined value in described finished vehicle electronic control unit, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
2. CNG automobile fuel gas supplying monitoring system according to claim 1, is characterized in that, described leak sensor be arranged in described gas supply system high-voltage tube between gas cylinder and cylinder valve directly over.
3. CNG automobile fuel gas supplying monitoring system according to claim 1, is characterized in that, described finished vehicle electronic control unit is connected and comprises with described gas supply system:
Described finished vehicle electronic control unit is connected with the gas rail pressure sensor in described gas supply system;
Described finished vehicle electronic control unit is connected with the Twoway valves controller in described gas supply system;
Described finished vehicle electronic control unit is connected with the decompressor solenoid valve in described gas supply system;
Described finished vehicle electronic control unit is connected with the gas nozzle in described gas supply system.
4. CNG automobile fuel gas supplying monitoring system according to claim 3, it is characterized in that, described decompressor solenoid valve is connected with described finished vehicle electronic control unit by the 3rd switch, wherein, the control end of described the 3rd switch is connected with described finished vehicle electronic control unit, input end is connected with described power supply, and output terminal is connected with described decompressor solenoid valve.
5. CNG automobile fuel gas supplying monitoring system according to claim 4, is characterized in that, described the first switch is the first relay, and described second switch is the second relay, and described the 3rd switch is the 3rd relay.
6. CNG automobile fuel gas supplying monitoring system according to claim 1, is characterized in that, described CNG automobile is satisfied to be comprised by gas condition:
Described finished vehicle electronic control unit receives that described oil-gas switch switch sends uses gas demand signal;
The engine water temperature that described finished vehicle electronic control unit detects described CNG automobile is greater than preset temperature;
The engine speed that described finished vehicle electronic control unit detects described CNG automobile is greater than preset rotation speed.
7. according to the CNG automobile fuel gas supplying monitoring system described in claim 1-6 any one, it is characterized in that, described supervisory system also comprises: the warning device being connected with described finished vehicle electronic control unit.
8. CNG automobile fuel gas supplying monitoring system according to claim 7, is characterized in that, described warning device is beacon or buzzer.
9. a CNG automobile fuel gas supplying monitoring method, is applied to the CNG automobile fuel gas supplying monitoring system described in claim 1-8 any one, it is characterized in that, comprising:
Judge whether gas supply system gas concentration around surpasses predefined value;
Judge whether described CNG automobile meets the gas condition of using;
When described gas supply system gas concentration around does not surpass predefined value, and when described CNG automobile meets by gas condition, described finished vehicle electronic control unit is controlled described second switch and is switched to the second output terminal, otherwise described car load control unit is controlled described second switch and is switched to the first output terminal.
10. automobile fuel gas supplying monitoring method according to claim 9, is characterized in that, described CNG automobile is satisfied to be comprised by gas condition:
Described finished vehicle electronic control unit receives that described oil-gas switch switch sends uses gas demand signal;
The engine water temperature that described finished vehicle electronic control unit detects described CNG automobile is greater than preset temperature;
The engine speed that described finished vehicle electronic control unit detects described CNG automobile is greater than preset rotation speed.
11. automobile fuel gas supplying monitoring methods according to claim 10, is characterized in that, also comprise: when described gas supply system gas concentration around surpasses predefined value, report to the police.
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| CN201310573863.3A CN103603735B (en) | 2013-11-14 | 2013-11-14 | A kind of CNG automobile fuel gas supply supervisory system and method |
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| CN103603735B (en) | 2016-03-16 |
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