Intelligent LNG (Liquefied Natural Gas) supply control system

Abstract

The invention discloses an intelligent LNG fuel gas supply control system which comprises an LNG liquid outlet electromagnetic valve and an LNG pressure sensor, one end of the LNG liquid outlet electromagnetic valve is connected with a storage battery through a wire, the other end of the LNG liquid outlet electromagnetic valve is connected with a power supply relay through a wire, one end of the power supply relay is connected with a key switch through a wire, and the other end of the power supply relay is connected with an LNG pressure sensor. And one end of the power supply relay is also connected with the storage battery through a wire, the liquid inlet end of the LNG liquid outlet electromagnetic valve is installed on a liquid outlet of the LNG gas cylinder, and the liquid outlet end of the LNG liquid outlet electromagnetic valve is connected to the LNG vaporizer. Through cooperative use of the storage battery, the vehicle key switch and the power supply relay, the LNG liquid outlet electromagnetic valve has the advantage that the power supply relay and the LNG liquid outlet electromagnetic valve are in linkage, and opening and closing of the LNG liquid outlet electromagnetic valve are automatically controlled when the vehicle key switch is turned on and turned off; through the combination instrument, the pressure of the LNG cylinder can be detected in real time, the pressure condition of the cylinder can be mastered in real time in a cab, and the safety problem caused by the pressure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical engineering automobile engine gaseous fuel control components, in particular to an intelligent LNG gas supply control system. BACKGROUND

[0002] LNG is liquefied natural gas (LNG for short), and the LNG gas supply control system is a vehicle-mounted LNG core key component. Generally, in order to ensure that the low-temperature liquid LNG (-162 DEG C) fuel is successfully converted into gas, a manual stop valve is installed at the liquid outlet of the LNG tank. When the vehicle needs to start, the driver operates the cylinder liquid outlet stop valve switch to open the manual stop valve, so that the low-temperature liquid LNG is transported to the vaporizer through the internal pressure of the cylinder, and the engine coolant exchanges with the low-temperature liquid LNG through the vaporizer, so that the low-temperature liquid LNG is converted into gaseous fuel, and the gaseous fuel is input to the engine through the gas supply pipeline for combustion. When the vehicle stops running, the driver operates the liquid outlet stop valve switch to close the liquid outlet stop valve, and the low-temperature liquid in the cylinder stops flowing into the vaporizer.

[0003] At present, the gas control system on the automobile has the following problems: (1) the LNG gas control system is not intelligent enough. Before the vehicle starts, the driver needs to stand on one side of the cylinder valve and manually open the liquid outlet stop valve. When the vehicle stops running, the driver needs to stand on one side of the cylinder valve and manually close the cylinder liquid outlet stop valve. This operation depends heavily on the driver's operation and requires the driver to operate frequently to achieve it; (2) in the LNG gas supply system, the gas pressure is usually only read on the cylinder pressure gauge. When the cylinder pressure is too low or too high, the driver cannot know the cylinder pressure, which may lead to insufficient liquid output due to insufficient pressure, thereby affecting the safety performance of the vehicle and the degree of intelligence. In view of this, the following technical scheme is proposed. SUMMARY

[0004] The present application aims to provide an intelligent LNG gas supply control system, which has the advantages of power relay and LNG liquid outlet electromagnetic valve linkage, and solves the problem of insufficient intelligence in the LNG gas control system. Before the vehicle starts, the driver needs to stand on one side of the cylinder valve and manually open the liquid outlet stop valve.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an intelligent LNG gas supply control system, comprising an LNG liquid outlet electromagnetic valve and an LNG pressure sensor, one end of the LNG liquid outlet electromagnetic valve is connected with a storage battery through a wire, the other end of the LNG liquid outlet electromagnetic valve is connected with a power relay through a wire, one end of the power relay is connected with a key switch through a wire, and one end of the power relay is also connected with the storage battery through a wire.

[0006] Preferably, the liquid outlet end of the LNG outlet solenoid valve is installed on the liquid outlet of the LNG cylinder, the liquid outlet end of the LNG outlet solenoid valve is connected to the LNG vaporizer, and the LNG outlet solenoid valve is connected to the vehicle key switch through the power relay.

[0007] Preferably, the power relay and the storage battery are both installed on the vehicle chassis, the storage battery is the power supply of the whole vehicle, and is 24V.

[0008] Preferably, the LNG pressure sensor is installed on the LNG cylinder, and one end of the LNG pressure sensor is connected to a combination instrument through a wire, and the combination instrument is located on the vehicle instrument panel.

[0009] Preferably, one end of the LNG pressure sensor is connected to a capacitor one through a wire, the other end of the LNG pressure sensor is connected to a capacitor two through a wire, the capacitor one and the capacitor two are connected through a wire, the capacitor one is a ceramic capacitor with a capacitance of 0.1 mu F, and the capacitor two is an electrolytic capacitor with a capacitance of 10 mu F.

[0010] Preferably, a fuse is connected in series on the wire between the power relay and the storage battery, and a self-diagnosis interface is connected to the wire between the key switch and the storage battery.

[0011] Preferably, a diode is connected in antiparallel across the coil of the power relay, one end of the power relay is further connected to a resistor through a wire, the other end of the power relay is connected to a capacitor three, and the resistor and the capacitor three are connected through a wire.

[0012] Preferably, the combination instrument is connected to a fault indicator lamp through a wire, and the fault indicator lamp is installed in the cab.

[0013] Compared with the prior art, the application has the following advantages:

[0014] 1. By cooperating the storage battery, the vehicle key switch and the power relay, the power relay and the LNG outlet solenoid valve are linked to automatically control the opening and closing of the LNG outlet solenoid valve when the vehicle key switch is opened and closed.

[0015] 2. By using the combination instrument, the LNG cylinder pressure can be detected in real time, so that the driver can know the cylinder pressure in real time and avoid safety problems caused by pressure.

[0016] 3. By cooperating the capacitor one and the capacitor two, various electromagnetic interferences in the automobile circuit are solved, the filter capacitor can filter the high-frequency interference signals on the power line, so that the LNG pressure sensor obtains a more stable power supply, thereby improving the accuracy of pressure detection.

[0017] 4、The application uses a fuse, when a short circuit fault occurs in the circuit, the fuse will melt and cut off the circuit, thereby protecting the battery, power relay and other electrical equipment from damage.

[0018] 5、The application uses a self-diagnosis interface, which allows maintenance personnel to use a dedicated diagnostic instrument to read the fault code and real-time data of the LNG system, quickly locate and eliminate faults, and improve maintenance efficiency.

[0019] 6、The application uses a diode in anti-parallel connection, which can short-circuit the reverse electromotive force when the power relay coil is powered off, thereby protecting the power relay coil and the components in the control circuit from the impact of reverse voltage.

[0020] 7、The application uses a resistor and a capacitor in combination to form an RC absorption circuit, which can suppress the generation of electric arc when the power relay contact is disconnected, thereby prolonging the service life of the power relay contact and reducing the interference of electric arc on other circuits. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The schematic diagram of the application. DETAILED DESCRIPTION

[0022] Please refer to Figure 1 An intelligent LNG gas supply control system, comprising an LNG outlet electromagnetic valve and an LNG pressure sensor, one end of the LNG outlet electromagnetic valve is connected with a battery through a wire, the other end of the LNG outlet electromagnetic valve is connected with a power relay through a wire, one end of the power relay is connected with a key switch through a wire, and one end of the power relay is also connected with the battery through a wire.

[0023] The liquid inlet end of the LNG outlet electromagnetic valve is installed on the liquid outlet of the LNG cylinder, the liquid outlet end of the LNG outlet electromagnetic valve is connected to the LNG vaporizer, and the LNG outlet electromagnetic valve is connected with the vehicle key switch through the power relay.

[0024] The power relay and the battery are both installed on the vehicle chassis, the battery is the power source of the whole vehicle, and is 24V.

[0025] The LNG pressure sensor is installed on the LNG cylinder, one end of the LNG pressure sensor is connected with a combination instrument through a wire, and the combination instrument is located on the vehicle instrument table.

[0026] One end of the LNG pressure sensor is connected with a capacitor one through a wire, the other end of the LNG pressure sensor is connected with a capacitor two through a wire, the capacitor one and the capacitor two are connected through a wire, the capacitor one is a 0.1 mu F ceramic capacitor, and the capacitor two is a 10 mu F electrolytic capacitor; through the capacitor one and the capacitor two, various electromagnetic interferences existing in the automobile circuit are solved, the filter capacitor can filter the high-frequency interference signal on the power line, so that the LNG pressure sensor obtains more stable power supply, thereby improving the accuracy of pressure detection; the capacitor one and the capacitor two are combined into a filter capacitor.

[0027] A fuse is connected in series on the wire between the power supply relay and the storage battery, and a self-diagnosis interface is connected outside the wire between the key switch and the storage battery; through the use of the fuse, when a short circuit fault occurs in the circuit and the current is too large, the fuse will be fused, cutting off the circuit, thereby protecting the storage battery, the power supply relay and other electrical equipment from damage. For example: if a short circuit occurs inside the LNG liquid outlet electromagnetic valve, the fuse can cut off the power supply in time to avoid the expansion of the fault. Through the self-diagnosis interface, maintenance personnel can use a special diagnostic instrument to read the fault code, real-time data and other information of the LNG system, quickly locate and eliminate the fault, and improve the maintenance efficiency.

[0028] A diode is connected in anti-parallel across the two ends of the coil of the power supply relay, one end of the power supply relay is also connected with a resistor through a wire, and the other end of the power supply relay is connected with a capacitor three, and the resistor and the capacitor three are connected through a wire. By connecting a diode in anti-parallel: when the power supply relay coil is powered off, a reverse electromotive force will be generated, and the diode can short-circuit the reverse electromotive force to protect the power supply relay coil and the components in the control circuit from the impact of the reverse voltage. Through the cooperation of the resistor and the capacitor three, an RC absorption circuit is formed, which can suppress the generation of electric arc when the power supply relay contact is disconnected, prolong the service life of the power supply relay contact, and reduce the interference of the electric arc on other circuits.

[0029] The combination instrument is connected with a fault indication lamp through a wire, and the fault indication lamp is installed in the cab. When the LNG pressure sensor, the LNG liquid outlet electromagnetic valve or the power supply relay fails, the corresponding detection circuit triggers the fault indication lamp to light up, reminding the driver to check and maintain in time through the fault indication lamp.

[0030] When in use, through the cooperation of the battery, the vehicle key switch and the power relay, the power relay and the LNG liquid outlet electromagnetic valve realize linkage, and when the vehicle key switch is opened and closed, the opening and closing of the LNG liquid outlet electromagnetic valve are automatically controlled, without the need for the driver to get off the vehicle to operate, improving the convenience. Through the combination of the instrument, the LNG cylinder pressure can be detected in real time, so that the driver's cabin can real-time master the cylinder pressure condition, avoiding safety problems caused by pressure, and improving the intelligent degree. By using capacitor one and capacitor two, various electromagnetic interferences in the automobile circuit are solved, and the filter capacitor can filter out the high-frequency interference signal on the power line, so that the LNG pressure sensor obtains more stable power supply, thereby improving the accuracy of pressure detection. When a short circuit fault occurs in the circuit, the fuse will melt and cut off the circuit, thereby protecting the battery, power relay and other electrical equipment from damage. The use of self-diagnosis interface makes it convenient for maintenance personnel to use special diagnostic instruments to read the fault code, real-time data and other information of the LNG system, quickly locates and eliminates faults, and improves the maintenance efficiency. The use of a diode in anti-parallel: when the power relay coil is powered off, a reverse electromotive force will be generated, and the diode can short-circuit the reverse electromotive force to protect the power relay coil and the components in the control circuit from the impact of reverse voltage. The cooperation of the resistor and capacitor three forms an RC absorption circuit, which can suppress the generation of electric arc when the power relay contact is disconnected, prolong the service life of the power relay contact, and reduce the interference of electric arc to other circuits.

[0031] In summary: the intelligent LNG gas supply control system solves the problem of insufficient intelligence in the LNG gas control system by cooperating the battery, the vehicle key switch and the power relay, and the driver needs to get off the vehicle and stand beside the cylinder valve to manually open the liquid outlet stop valve before starting the vehicle.

Claims

1. An intelligent LNG gas supply control system, including an LNG liquid outlet solenoid valve and an LNG pressure sensor, characterized in that: One end of the LNG outlet solenoid valve is connected to a battery via a wire, the other end of the LNG outlet solenoid valve is connected to a power relay via a wire, one end of the power relay is connected to a key switch via a wire, and one end of the power relay is also connected to the battery via a wire.

2. The intelligent LNG gas supply control system according to claim 1, characterized in that: The liquid inlet end of the LNG liquid outlet solenoid valve is installed on the liquid outlet of the LNG cylinder, the liquid outlet end of the LNG liquid outlet solenoid valve is connected to the LNG vaporizer, and the LNG liquid outlet solenoid valve is connected to the vehicle key switch through a power relay.

3. The intelligent LNG gas supply control system according to claim 1, characterized in that: The power relay and battery are both installed on the vehicle chassis. The battery is the power source of the entire vehicle and is 24V.

4. The intelligent LNG gas supply control system according to claim 1, characterized in that: The LNG pressure sensor is installed on the LNG cylinder. One end of the LNG pressure sensor is connected to a combination instrument through a wire. The combination instrument is located on the vehicle instrument panel.

5. The intelligent LNG gas supply control system according to claim 1, characterized in that: One end of the LNG pressure sensor is connected to capacitor 1 through a wire, and the other end of the LNG pressure sensor is connected to capacitor 2 through a wire. Capacitor 1 and capacitor 2 are connected through a wire. Capacitor 1 is a 0.1μF ceramic capacitor, and capacitor 2 is a 10μF electrolytic capacitor.

6. The intelligent LNG gas supply control system according to claim 1, characterized in that: A fuse is connected in series on the wire between the power relay and the battery, and a self-diagnosis interface is externally connected on the wire between the key switch and the battery.

7. The intelligent LNG gas supply control system according to claim 1, characterized in that: A diode is connected in anti-parallel at both ends of the coil of the power relay, one end of the power relay is connected to a resistor via a wire, the other end of the power relay is connected to capacitor three, and the resistor and capacitor three are connected via a wire.

8. The intelligent LNG gas supply control system according to claim 1, characterized in that: The combined instrument is connected to a fault indicator light via a wire, and the fault indicator light is installed in the cab.

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