Control circuit for vehicle double-cavity oil tank

Abstract

The invention particularly discloses a control circuit for a vehicle double-cavity oil tank. The control circuit comprises a main and auxiliary oil tank change-over switch, a display instrument, a diesel oil filter, an oil tank change-over electromagnetic valve, a first plug-in unit and a second plug-in unit. And the main and auxiliary oil tank change-over switch is used for controlling the oil tank change-over electromagnetic valve to carry out oil supply change-over on the main oil tank or the auxiliary oil tank. The corresponding fuel quantity sensors of the main fuel tank and the auxiliary fuel tank are connected with the second plug-in wiring harness, and the display instrument is in signal connection with the fuel quantity sensors so as to display the fuel quantity value of the main fuel tank or the auxiliary fuel tank in real time; a circuit is divided into a first bundle section, a second bundle section and a third bundle section through the first plug-in and the second plug-in, so that wire harness connection is modularized, and the first bundle section and the second bundle section can be selectively added or removed according to assembly requirements. The modular design of the wire harness can be realized, and the design risk and the management difficulty are reduced, so that the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-chamber fuel tank control, and more specifically, to a control circuit for a vehicle dual-chamber fuel tank. Background Art

[0002] To prevent the problem of diesel waxing in low-temperature environments, especially in the north where the temperature ranges from -25°C to 4°C, diesel waxing can cause difficult cold starting of vehicles. Commercial vehicles usually consider using a dual-chamber fuel tank to solve this problem. The dual-chamber fuel tank divides the fuel tank into two independent main fuel tanks and auxiliary fuel tanks, which store 0# diesel and low-grade diesel (such as -35# diesel) respectively. When the vehicle cold starts, the fuel tank is switched to the auxiliary fuel tank. After the engine water temperature warms up the engine, it is switched to the main fuel tank for driving, and then switched to the auxiliary fuel tank for fuel supply before parking to ensure that low-grade diesel is used for fuel supply during the next cold start. To cope with the conversion between a common fuel tank and a dual-chamber fuel tank, the dual-chamber fuel tank is usually used as an optional configuration for cold regions. Vehicles with these two configurations require two different circuits to ensure the two fuel supply systems, resulting in a large number of wire harness categories, difficult parts management, low assembly efficiency, and high management and production costs. Therefore, how to provide a modular circuit that can be compatible with different controls of a common fuel tank and a dual-chamber fuel tank and achieve modular design of the wire harness is of great significance. Summary of the Invention

[0003] The present invention provides a control circuit for a vehicle dual-chamber fuel tank, which solves the problem that vehicles with a dual-chamber fuel tank currently require two fuel supply control circuits, resulting in high management and production costs. It can achieve modular design of the wire harness, reduce design risks and management difficulties, and thus reduce costs.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A control circuit for a vehicle dual-chamber fuel tank, comprising: a main-auxiliary fuel tank switching switch, a display instrument, a diesel filter, a fuel tank conversion solenoid valve, a first pair of connectors, and a second pair of connectors;

[0006] The output end of the main-auxiliary fuel tank switching switch is connected to the A connector wire harness of the first pair of connectors. The a connector corresponding to the A connector is connected to the B connector wire harness of the second pair of connectors. The b connector corresponding to the B connector is respectively connected to the display instrument, the diesel filter, and the fuel tank conversion solenoid valve wire harness;

[0007] The main-auxiliary fuel tank switching switch is used to control the fuel tank conversion solenoid valve to switch the fuel supply between the main fuel tank and the auxiliary fuel tank;

[0008] The fuel quantity sensors corresponding to the main fuel tank and the auxiliary fuel tank are both connected to the second pair of plug harnesses. When the B plug is inserted into the b plug, the display instrument is signal-connected to the fuel quantity sensor to display the fuel quantity value of the main fuel tank or the auxiliary fuel tank in real time;

[0009] The circuit is divided into a first bundle segment, a second bundle segment, and a third bundle segment through the first pair of plugs and the second pair of plugs, so as to modularize the harness connection, and then the first bundle segment and the second bundle segment can be selectively added or removed according to the assembly requirements.

[0010] Preferably, the main-auxiliary fuel tank changeover switch is provided with a first output port and a second output port. The first output port outputs a main fuel tank switch signal, and the second output port outputs an auxiliary fuel tank switch signal.

[0011] Preferably, when the vehicle is cold-started, the first output port of the main-auxiliary fuel tank changeover switch outputs a low level, and the second output port outputs a high level, so that the fuel tank changeover solenoid valve is switched to the auxiliary fuel tank for fuel supply.

[0012] Preferably, after the vehicle is started and the oil temperature in the diesel fuel filter is greater than the set temperature threshold, the first output port of the main-auxiliary fuel tank changeover switch outputs a high level, and the second output port outputs a low level, so that the fuel tank changeover solenoid valve is switched to the main fuel tank for fuel supply.

[0013] Preferably, the diesel fuel filter is provided with a diesel heater, an electric pump, and a water level sensor. The diesel heater heats up the fuel when the vehicle is cold-started, the electric pump is used to drive the fuel to flow, and the water level sensor is used to detect the accumulated water separated from the diesel.

[0014] Preferably, it further includes: an engine controller;

[0015] The engine controller is signal-connected to the water level sensor and gives an alarm when the accumulated water level in the diesel fuel filter is greater than the set water level threshold.

[0016] Preferably, a heater is provided in the main fuel tank. When the heater key is turned to the ON position, the fuel in the main fuel tank is heated up until it reaches the set temperature.

[0017] Preferably, the first pin of the B plug is connected to the ON position of the ignition switch, the second pin of the B plug is connected to the vehicle body ground, and the first connector and the second connector of the b plug are connected to the control end of the diesel fuel filter;

[0018] When the B plug is inserted into the b plug, the first pin is inserted together with the first connector, and the second pin is inserted together with the second connector.

[0019] Preferably, the fuel quantity sensor of the main fuel tank is connected to the fifth pin of the B connector, the input end of the display instrument is connected to the sixth pin of the B connector, the fifth connector of the b connector is connected to the third input end of the fuel tank switching solenoid valve, and the sixth connector of the b connector is connected to the first output end of the fuel tank switching solenoid valve;

[0020] When the B connector is plugged into the b connector, the fifth pin is plugged together with the fifth connector, and the sixth pin is plugged together with the sixth connector;

[0021] When the main fuel tank supplies fuel, the fuel tank switching solenoid valve conducts the signal connection between the third input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the main fuel tank and displays the corresponding fuel quantity value.

[0022] Preferably, the fuel quantity sensor of the auxiliary fuel tank is connected to the fourth input end of the fuel tank switching solenoid valve. When the auxiliary fuel tank supplies fuel, the fuel tank switching solenoid valve conducts the signal connection between the fourth input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the auxiliary fuel tank and displays the corresponding fuel quantity value.

[0023] The present invention provides a control circuit for a vehicle dual-chamber fuel tank. The circuit is divided into a first bundle segment, a second bundle segment and a third bundle segment through a first pair of connectors and a second pair of connectors, so that the wiring harness connection is modularized. The fuel supply of the main fuel tank or the auxiliary fuel tank is switched through the fuel tank switching solenoid valve, solving the problem that vehicles with dual-chamber fuel tanks in the prior art require two sets of fuel supply control circuits, resulting in high management and production costs. It can realize the modular design of the wiring harness, reduce the design risk and management difficulty, and thus reduce the cost. Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below.

[0025] Figure 1 is a schematic diagram of a control circuit for a vehicle dual-chamber fuel tank provided by the present invention.

[0026] Figure 2 is a schematic diagram of the circuit of a common fuel tank provided by the present invention. Detailed Embodiments

[0027] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the drawings and embodiments.

[0028] In view of the problem that current vehicles with dual-chamber fuel tanks require two sets of fuel supply control circuits, resulting in high management and production costs, the present invention provides a control circuit for a vehicle dual-chamber fuel tank, which solves the problem that existing vehicles with dual-chamber fuel tanks need two sets of fuel supply control circuits, has high management and production costs, can achieve modular design of the wiring harness, reduce design risks and management difficulties, and thus reduce costs.

[0029] As Figure 1 shown, a control circuit for a vehicle dual-chamber fuel tank includes: a main and auxiliary fuel tank switching switch 1, a display instrument 2, a diesel fuel filter 4, a fuel tank conversion solenoid valve 5, a first pair of plug-ins and a second pair of plug-ins. The output end of the main and auxiliary fuel tank switching switch 1 is wire-connected to the A plug-in of the first pair of plug-ins, the a plug-in corresponding to the A plug-in is wire-connected to the B plug-in of the second pair of plug-ins, and the b plug-in corresponding to the B plug-in is respectively wire-connected to the display instrument 2, the diesel fuel filter 4, and the fuel tank conversion solenoid valve 5. The main and auxiliary fuel tank switching switch 1 is used to control the fuel tank conversion solenoid valve to perform fuel supply switching between the main fuel tank 3 and the auxiliary fuel tank 6. The fuel quantity sensors corresponding to the main fuel tank 3 and the auxiliary fuel tank 1 are both wire-connected to the second pair of plug-ins. When the B plug-in and the b plug-in are plugged in, the display instrument 2 is signal-connected to the fuel quantity sensor to display the fuel quantity value of the main fuel tank 3 or the auxiliary fuel tank 6 in real time. The circuit is divided into a first wire segment, a second wire segment, and a third wire segment through the first pair of plug-ins and the second pair of plug-ins, so that the wire harness connection is modular, and then the first wire segment and the second wire segment can be selectively added or removed according to the assembly requirements.

[0030] Specifically, the first pair of plug-ins includes: an A plug-in and an a plug-in, and the second pair of plug-ins includes: a B plug-in and a b plug-in. As Figure 1 shown, the first wire segment is composed of the main and auxiliary fuel tank switching switch 1 and the A plug-in, the second wire segment is composed of the a plug-in, the display instrument 2, the main fuel tank 3, the B plug-in, and the b plug-in, and the third wire segment is composed of the b plug-in, the diesel fuel filter 4, the fuel tank conversion solenoid valve 5, and the auxiliary fuel tank 6. The first wire segment and the third wire segment of the circuit are set as independent wire harnesses. During assembly, different configurations can be selected. The standard configuration is a common fuel tank, and a dual-chamber fuel tank can be optionally installed. By adding the first wire segment and the third wire segment on the basis of the standard configuration, the selection of the dual-chamber fuel tank can be satisfied. When the vehicle uses a dual-chamber fuel tank, the first wire segment, the second wire segment, and the third wire segment are used. The first wire segment is connected to the second wire segment through the first pair of plug-ins, and the second wire segment and the third wire segment are connected through the second pair of plug-ins.

[0031] Furthermore, the main and auxiliary fuel tank switching switch is provided with a first output port and a second output port. The first output port outputs a main fuel tank switch signal, and the second output port outputs an auxiliary fuel tank switch signal.

[0032] Further, when the vehicle is cold-started, the first output port of the main and auxiliary fuel tank switching switch outputs a low level, and the second output port outputs a high level, causing the fuel tank conversion solenoid valve to switch to the auxiliary fuel tank for fuel supply.

[0033] Further, after the vehicle is started and the oil temperature in the diesel fuel filter is greater than the set temperature threshold, the first output port of the main and auxiliary fuel tank switching switch outputs a high level, and the second output port outputs a low level, causing the fuel tank conversion solenoid valve to switch to the main fuel tank for fuel supply.

[0034] Further, the diesel fuel filter is provided with a diesel heater, an electric pump, and a water level sensor. The diesel heater heats up the fuel after the vehicle is cold-started. The electric pump is used to drive the fuel to flow, and the water level sensor is used to detect the accumulated water separated from the diesel.

[0035] The system further includes: an engine controller; the engine controller is signal-connected to the water level sensor and alarms when the accumulated water level in the diesel fuel filter is greater than the set water level threshold.

[0036] Further, a heater is provided in the main fuel tank. When the heater key is turned to the ON position, the fuel in the main fuel tank is heated up until it reaches the set temperature.

[0037] Further, the first pin of the B connector is connected to the ON position of the ignition switch, the second pin of the B connector is connected to the vehicle body ground, and the first and second connectors of the b connector are connected to the control end of the diesel fuel filter;

[0038] When the B connector is plugged into the b connector, the first pin is plugged together with the first connector, and the second pin is plugged together with the second connector.

[0039] Further, the fuel quantity sensor of the main fuel tank is connected to the fifth pin of the B connector, the input end of the display instrument is connected to the sixth pin of the B connector, the fifth connector of the b connector is connected to the third input end of the fuel tank conversion solenoid valve, and the sixth connector of the b connector is connected to the first output end of the fuel tank conversion solenoid valve;

[0040] When the B connector is plugged into the b connector, the fifth pin is plugged together with the fifth connector, and the sixth pin is plugged together with the sixth connector;

[0041] When the main fuel tank supplies fuel, the fuel tank conversion solenoid valve conducts the signal connection between the third input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the main fuel tank and displays the corresponding fuel quantity value.

[0042] Further, the fuel quantity sensor of the auxiliary fuel tank is connected to the fourth input end of the fuel tank conversion solenoid valve. When the auxiliary fuel tank supplies fuel, the fuel tank conversion solenoid valve conducts the signal connection between the fourth input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the auxiliary fuel tank and displays the corresponding fuel quantity value.

[0043] In practical applications, the fuel tank conversion solenoid valve can adopt a two-position three-way valve, with two fuel inlet pipelines and one fuel outlet pipeline. The two fuel inlet pipelines are respectively connected to the main fuel tank and the auxiliary fuel tank. The fuel tank conversion solenoid valve controls the main fuel tank or the auxiliary fuel tank to supply fuel according to the main and auxiliary fuel tank switching switch. Of course, the fuel tank conversion solenoid valve can also integrate multiple signal connectors, so that the fuel quantity sensors of the main fuel tank and the auxiliary fuel tank are respectively connected to the corresponding signal connectors. When using the main fuel tank to supply fuel, the corresponding signal connector conducts the signal connection between the fuel quantity sensor of the main fuel tank and the display instrument; when using the auxiliary fuel tank to supply fuel, the corresponding signal connector conducts the signal connection between the fuel quantity sensor of the auxiliary fuel tank and the display instrument.

[0044] As Figure 1 shown, switch the main and auxiliary fuel tank switching switch 1 to the auxiliary fuel tank for fuel supply. At this time, the auxiliary fuel tank switch signal is high and the main fuel tank switch signal is low. The switch signal passes through the main and auxiliary fuel tank switching switch 1 → A connector → a connector → B connector → b connector → fuel tank conversion solenoid valve 5. The fuel tank conversion solenoid valve 5 judges according to the switch signal output by the main and auxiliary fuel tank switching switch to control the solenoid valve to switch to the auxiliary fuel tank for fuel supply, receives the fuel quantity sensor signal output by the auxiliary fuel tank 6, and outputs it to the display instrument 2 through the sixth connector b-6 → the sixth pin B-6 → the display instrument 2. Turn the key to the ON position, start the vehicle, and the main fuel tank 3 and the diesel filter 4 are powered on. When the oil temperature reaches a certain value, switch the main and auxiliary fuel tank switching switch 1 to the main fuel tank. At this time, the main fuel tank switch signal is high and the auxiliary fuel tank switch signal is low. The fuel tank conversion solenoid valve 5 switches to the main fuel tank for fuel supply and receives the fuel quantity sensor signal output by the main fuel tank 3 → the fifth pin B-5 → the fifth connector b-5. Then the fifth connector b-5 conducts the fifth connector b-5 and the sixth connector b-6 through the signal connector in the fuel tank conversion solenoid valve, and then through the sixth connector b-6 → the sixth pin B-6 → the display instrument 2.

[0045] When the vehicle uses the ordinary fuel tank, use the second beam segment, and the circuit diagram can be simplified to Figure 2 shown. At this time, only the fifth pin b-5 and the sixth pin b-6 in the b connector are short-circuited through a wire and inserted into the B connector. The fuel quantity sensor signal in the main fuel tank 3 is input to the display instrument 2 through the fifth pin B-5 → the fifth connector b-5 → the sixth connector b-6 → the sixth pin B-6.

[0046] It can be seen that the present invention provides a control circuit for a vehicle dual-chamber fuel tank. The circuit is divided into a first bundle segment, a second bundle segment, and a third bundle segment through a first pair of plug-ins and a second pair of plug-ins, so as to modularize the wiring harness connection. And the fuel supply switching between the main fuel tank and the auxiliary fuel tank is realized through a fuel tank conversion solenoid valve, solving the problem that vehicles with dual-chamber fuel tanks in the prior art require two sets of fuel supply control circuits, resulting in high management and production costs. It can achieve a modular design of the wiring harness, reduce the design risk and management difficulty, thereby reducing costs.

[0047] The structure, features, and function effects of the present invention have been described in detail based on the illustrated embodiments above. The above is only the preferred embodiment of the present invention, but the present invention is not limited to the implementation scope shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, should still be within the protection scope of the present invention as long as they do not exceed the spirit covered by the description and the drawings.

Claims

1. A control circuit for a vehicle dual-chamber fuel tank, characterized in that, Including: The main and auxiliary fuel tank switching switch, display instrument, diesel filter, fuel tank conversion solenoid valve, the first pair of plug-ins and the second pair of plug-ins; The output end of the main and auxiliary fuel tank switching switch is connected to the A plug-in wiring harness of the first pair of plug-ins. The a plug-in corresponding to the A plug-in is connected to the B plug-in wiring harness of the second pair of plug-ins. The b plug-ins corresponding to the B plug-ins are respectively connected to the display instrument, the diesel filter, and the fuel tank conversion solenoid valve wiring harness; The main and auxiliary fuel tank switching switch is used to control the fuel tank conversion solenoid valve to switch the fuel supply between the main fuel tank and the auxiliary fuel tank; The fuel quantity sensors corresponding to the main fuel tank and the auxiliary fuel tank are both connected to the second pair of plug-in wiring harnesses. When the B plug-in is plugged into the b plug-in, the display instrument is signal-connected to the fuel quantity sensor to display the fuel quantity value of the main fuel tank or the auxiliary fuel tank in real time; The circuit is divided into a first bundle segment, a second bundle segment and a third bundle segment through the first pair of plug-ins and the second pair of plug-ins, so that the wiring harness connection is modular, and then the first bundle segment and the second bundle segment can be selectively added or removed according to the assembly requirements.

2. The control circuit for a vehicle dual-chamber fuel tank according to claim 1, characterized in that, The main and auxiliary fuel tank switching switch is provided with a first output port and a second output port. The first output port outputs a main fuel tank switch signal, and the second output port outputs an auxiliary fuel tank switch signal.

3. The control circuit for a vehicle dual-chamber fuel tank according to claim 2, characterized in that, When the vehicle is cold-started, the first output port of the main and auxiliary fuel tank switching switch outputs a low level, and the second output port outputs a high level, so that the fuel tank conversion solenoid valve switches to the auxiliary fuel tank for fuel supply.

4. The control circuit for a vehicle dual-chamber fuel tank according to claim 3, wherein After the vehicle is started and the oil temperature in the diesel filter is greater than the set temperature threshold, the first output port of the main and auxiliary fuel tank switching switch outputs a high level, and the second output port outputs a low level, so that the fuel tank conversion solenoid valve switches to the main fuel tank for fuel supply.

5. The control circuit for a dual-chamber fuel tank of a vehicle according to claim 4, characterized in that, The diesel filter is provided with a diesel heater, an electric pump and a water level sensor. The diesel heater heats up the fuel when the vehicle is cold-started. The electric pump is used to drive the fuel to flow, and the water level sensor is used to detect the accumulated water separated from the diesel.

6. The control circuit for a vehicle dual-chamber fuel tank according to claim 5, characterized in that, Also including: Engine controller; The engine controller is signal-connected to the water level sensor and alarms when the accumulated water level in the diesel filter is greater than the set water level threshold.

7. The control circuit for a vehicle dual-chamber fuel tank according to claim 6, wherein, A heater is provided in the main fuel tank. When the heater key is turned to the ON position, the fuel in the main fuel tank is heated up until it reaches the set temperature.

8. The control circuit for a vehicle dual-chamber fuel tank according to claim 7, characterized in that, The first pin of the B plug-in is connected to the ON position of the ignition switch, the second pin of the B plug-in is connected to the vehicle body ground, and the first and second connectors of the b plug-in are connected to the control end of the diesel filter; When the B plug-in is plugged into the b plug-in, the first pin is plugged together with the first connector, and the second pin is plugged together with the second connector.

9. The control circuit for a vehicle dual-chamber fuel tank according to claim 8, characterized in that, The fuel quantity sensor of the main fuel tank is connected to the fifth pin of the B connector, the input end of the display instrument is connected to the sixth pin of the B connector, the fifth connector of the b connector is connected to the third input end of the fuel tank switching solenoid valve, and the sixth connector of the b connector is connected to the first output end of the fuel tank switching solenoid valve; When the B connector is plugged into the b connector, the fifth pin is plugged together with the fifth connector, and the sixth pin is plugged together with the sixth connector; When the main fuel tank supplies fuel, the fuel tank switching solenoid valve conducts the signal connection between the third input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the main fuel tank and displays the corresponding fuel quantity value.

10. The control circuit for a vehicle dual-chamber fuel tank according to claim 9, wherein, The fuel quantity sensor of the auxiliary fuel tank is connected to the fourth input end of the fuel tank switching solenoid valve. When the auxiliary fuel tank supplies fuel, the fuel tank switching solenoid valve conducts the signal connection between the fourth input end and the first output end, so that the display instrument receives the detection signal of the fuel quantity sensor of the auxiliary fuel tank and displays the corresponding fuel quantity value.

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