CN102128107A - Device and method for producing oxyhydrogen through vehicle-mounted oxyhydrogen producer using residual electricity supplied by internal combustion engine - Google Patents

Abstract

The invention relates to a device and a method for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen and oxygen production machine for hydrogen and oxygen. On the basis of retaining all the body and control system of the original internal combustion engine, the system adds a vehicle-mounted hydrogen and oxygen generator control system and a hydrogen and oxygen production, storage and supply system. The device mainly includes: a vehicle-mounted hydrogen generator, a hydrogen storage tank connected to the hydrogen outlet of the vehicle-mounted hydrogen generator, a hydrogen pressure reducer and a hydrogen flame-retardant valve, an oxygen storage tank connected to the oxygen outlet of the vehicle-mounted hydrogen generator, an oxygen Pressure reducer and oxygen flame retardant valve, battery circuit relay connected between generator and battery, hydrogen generator circuit relay connected between generator and hydrogen generator, electronic control unit, etc. The electronic control unit controls the operation of the hydrogen generator according to the relationship between the voltage of the generator and the battery and the pressure of the hydrogen and oxygen gas in the storage tank, giving priority to ensuring the charging of the battery, and stopping the generator when the gas in the hydrogen and oxygen tank is overpressured. Oxygen machine running.

Description

A device and method for supplying residual power of internal combustion engine to vehicle-mounted hydrogen and oxygen production mechanism for hydrogen and oxygen

technical field

The invention provides a device and control method for a vehicle-mounted hydrogen and oxygen generator to produce hydrogen and oxygen by using the residual power of an internal combustion engine, and the specific content relates to a device for producing, storing and supplying hydrogen and oxygen based on a vehicle-mounted hydrogen and oxygen generator using excess electric energy of the internal combustion engine and control methods.

Background technique

Gasoline and diesel internal combustion engines often produce a large amount of harmful emissions during operation. At the same time, the dwindling of oil resources has also made it an inevitable trend to improve the thermal efficiency of internal combustion engines. Compared with traditional gasoline and diesel fuel, hydrogen has many excellent combustion and physical and chemical characteristics such as low ignition energy, fast combustion speed, and wide lean burn boundary. Therefore, mixing hydrogen when the internal combustion engine is running can effectively improve the thermal efficiency of the engine and reduce its harmful emissions. Oxygen is also an excellent combustion aid. Increasing the oxygen concentration in the intake air of an internal combustion engine is beneficial to reducing the oxygen-poor combustion zone in the cylinder, thereby inhibiting the generation of harmful emissions such as CO and particulate matter. At the same time, in plateau areas, increasing the oxygen content in the intake air is also conducive to improving the power and torque output characteristics of the internal combustion engine.

Hydrogen can be produced by reforming methane or coal, but the process of producing hydrogen from these raw materials still consumes a lot of energy and generates carbon dioxide emissions. At the same time, as things currently stand, the infrastructure for supplying hydrogen and oxygen for vehicles is still minimal. Therefore, it is difficult for the vehicle to refill hydrogen and oxygen at any time like adding gasoline and diesel during driving.

On the other hand, the problem of on-board storage and transportation of hydrogen has not yet been resolved. Hydrogen storage methods currently mainly include high-pressure gaseous hydrogen storage, liquid hydrogen storage, and metal hydride hydrogen storage. However, when hydrogen is stored by the above method, the quality of the equipment is often large and the cost is relatively high. At the same time, hydrogen is extremely easy to burn or even explode in an oxygen environment. Therefore, carrying hydrogen and oxygen with the vehicle at the same time and storing them in high-pressure containers will bring hidden dangers to the operation safety of the vehicle.

It is an effective way to realize the storage and application of hydrogen and oxygen on the internal combustion engine by using the on-board electrolysis of water to produce hydrogen and oxygen. Storing a small amount of hydrogen and oxygen produced by the oxyhydrogen generator in a storage device with a small volume and low pressure can also effectively reduce the safety problems caused by the large amount of hydrogen and oxygen stored on the vehicle. However, the electrolyzed water hydrogen generator consumes a lot of power during operation. If the operation mode is not effectively controlled, it may over-consume the battery power, shorten the life of the battery, and affect the operation of the vehicle. At the same time, when the storage battery is saturated, although the generator is still working at this time, the excess electric energy generated by the generator cannot continue to be charged into the storage battery, thereby causing energy waste.

Contents of the invention

Aiming at the current problems of hydrogen and oxygen filling and on-board storage and transportation, the waste of excess electric energy of the generator when the battery is fully charged, and the large consumption of electric energy by the on-board hydrogen-oxygen generator that shortens the life of the battery, the present invention provides a vehicle-mounted hydrogen production The invention relates to a device and a method for producing hydrogen and oxygen by using the residual power of an internal combustion engine.

The present invention adopts the following technical scheme. A device for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen-oxygen system in this invention includes an internal combustion engine body 1 , an internal combustion engine generator 2 and a storage battery 6 . On the basis of retaining the internal combustion engine body 1 and all accessories, it adds a set of vehicle-mounted hydrogen and oxygen generator control system and a set of hydrogen and oxygen production, storage, and supply systems, including: electronic control unit 3, vehicle-mounted hydrogen and oxygen generator 11, The oxygen storage tank 8 and the hydrogen storage tank 10 connected with the vehicle-mounted hydrogen generator 11, the oxygen pressure sensor 7 and the hydrogen pressure sensor 9 installed on the oxygen storage tank 8 and the hydrogen storage tank 10 respectively, link to each other with the oxygen storage tank 8 The oxygen pressure regulator 13 and the flame retardant valve 15 of the oxygen pipeline, the hydrogen pressure regulator 12 connected with the hydrogen storage tank 10 and the flame retardant valve 14 of the hydrogen pipeline, the generator 2 and the battery 6 are connected by a battery The loop relay 4 is connected with the loop relay 5 of the hydrogen-oxygen machine by cables between the generator 2 and the hydrogen-oxygen machine 11;

The electronic control unit 3 is connected with the internal combustion engine generator 2 to obtain the generator voltage signal a; the electronic control unit 3 is connected with the battery circuit relay 4 and the hydrogen-oxygen generator circuit relay 5 respectively, and controls the battery circuit respectively by sending control signals c and b The on-off of the relay 4 and the circuit relay 5 of the hydrogen-oxygen generator; the electronic control unit 3 is connected to the hydrogen pressure sensor 9 and the oxygen pressure sensor 7 respectively to obtain the pressure signal d of the hydrogen storage tank and the pressure signal e of the oxygen storage tank;

The electronic control unit 3 is connected to the battery 6 to obtain the battery voltage signal f;

The internal combustion engine generator 2 is connected with the internal combustion engine body.

Described internal combustion engine includes gasoline engine and diesel engine.

The electronic control unit 3 is connected with other components through shielded cables.

The control method of the above-mentioned internal combustion engine emission control device based on the vehicle-mounted hydrogen and oxygen generator comprises the following steps:

A device for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen-oxygen production mechanism for hydrogen-oxygen gas first detects the generator voltage signal a and the battery voltage signal f, and is mainly divided into two types according to the relationship between the generator voltage Vg and the battery voltage Vb. Condition:

1) Vg=<Vb

The electronic control unit 3 detects the voltage signal a of the internal combustion engine generator and the voltage signal f of the storage battery. When Vg=<Vb, the electronic control unit 3 determines that the electric energy provided by the generator is not enough to charge the storage battery 6 and cannot be provided to the vehicle-mounted hydrogen generator. 11 Electrolysis of water to produce hydrogen. Therefore, when Vg=<Vb, the electronic control unit 3 sends control signals b and c to cut off the battery circuit relay 4 and the hydrogen-oxygen generator circuit relay 5 simultaneously;

2) Vg>Vb

The electronic control unit 3 detects the internal combustion engine generator voltage signal a and the battery voltage signal f, and when the generator voltage is higher than the battery voltage, the electronic control unit 3 determines that the generator can charge the battery 6 at this time and provide it to the on-board hydrogen generator 11 Production of hydrogen and oxygen gas; when Vg>Vb, it can be divided into two situations according to the relationship between the battery voltage Vb and the battery full-load voltage Vf:

a) Vb<Vf

In order to ensure the normal operation of the vehicle and the service life of the battery, when Vb<Vf, the electronic control unit 3 first ensures that the battery is charged; in the case of Vb<Vf, the electronic control unit 3 sends a control signal b to cut off the hydrogen-oxygen generator circuit relay 5 , and send a control signal c to connect the battery circuit relay 4, so that all the electric energy generated by the generator is used for charging the battery.

b) Vb>=Vf

When Vb>=Vf, the electronic control unit 3 judges that the storage battery has been charged, and the surplus power produced during generator operation can be provided to the vehicle-mounted oxygen generator 11 to prepare hydrogen and oxygen on board; at this time, the electronic control unit continues Detect the pressure signal d of the hydrogen storage tank and the pressure signal e of the oxygen storage tank. When the pressure of any storage tank of hydrogen or oxygen is greater than or equal to the maximum pressure Ps of the storage tank design, in order to ensure the safe operation of the system, the electronic control unit 3 sends a control signal b to cut off Hydrogen-oxygen machine circuit relay 5 makes vehicle-mounted hydrogen-oxygen machine 11 stop producing hydrogen and oxygen, and sends a control signal c to cut off battery circuit relay 4 to stop battery charging; when the pressure in any gas storage tank of hydrogen or oxygen is lower than Ps , the electronic control unit 3 sends a control signal c to cut off the battery circuit relay 4 to stop the charging of the battery, and sends a control signal b to connect the hydrogen and oxygen generator circuit relay 5 to supply all the excess electric energy generated when the generator is running to the on-board hydrogen production Oxygen machine 11 produces hydrogen and oxygen; The hydrogen and oxygen obtained by hydrogen-oxygen machine 11 are stored in hydrogen storage tank 10 and oxygen storage tank 8 respectively, and pass through hydrogen pressure regulator 12, oxygen pressure regulator 13, hydrogen gas respectively. The flame retardant valve 14 of the pipeline and the flame retardant valve 15 of the oxygen pipeline are delivered to the hydrogen and oxygen outlets of the system for use by vehicles.

The working process of the present invention: the electronic control unit 3 judges the operation mode according to the output voltage of the generator and the battery voltage detected first. When the generator voltage is lower than the battery voltage, the electronic control unit 3 sends control signals b and c to simultaneously cut off the battery circuit relay 4 and the hydrogen generator circuit relay 5, thereby stopping charging the battery and running the hydrogen generator. When the generator voltage is higher than the battery voltage, and the battery voltage has not yet reached the full state voltage, the electronic control unit 3 sends a control signal c to connect the battery circuit relay 4, and sends a control signal b to disconnect the hydrogen generator circuit relay 5, so that All the electricity from the generator is used to charge the battery. When the generator voltage is higher than the battery voltage, the battery is full and the pressure of any storage tank of hydrogen or oxygen is lower than the design pressure of the tank, the electronic control unit 3 sends a control signal c to cut off the battery circuit relay 4, and sends a control signal b to turn on the control Hydroxygen generator loop relay 5 makes the vehicle-mounted hydrogen generator 11 can utilize the excess electric energy produced by the generator to produce hydrogen and oxygen, and store the hydrogen and oxygen in the hydrogen storage tank 10 and the oxygen storage tank 8 respectively. The hydrogen and oxygen stored in the tank are delivered to the hydrogen and oxygen outlets of the system at a stable pressure through their independent supply pipelines, after a pressure reducer and a flame retardant valve. When the generator voltage is higher than the battery voltage, the battery is full and the pressure of any storage tank of hydrogen or oxygen is greater than or equal to the design pressure of the tank, the electronic control unit 3 sends control signals b and c to simultaneously cut off the battery circuit relay 4 and the hydrogen generator circuit Relay 5, thereby stops charging to accumulator and the operation of oxyhydrogen machine. The hydrogen and oxygen stored in the hydrogen and oxygen tanks can still be delivered to the hydrogen and oxygen outlets of the system through their respective supply pipelines, pressure reducers and flame retardant valves.

The beneficial effects of the present invention are as follows: aiming at the current difficulties in hydrogen and oxygen filling and on-vehicle storage and transportation, when the battery is fully loaded, the excess electric energy generated by the generator cannot be recovered, and the vehicle-mounted hydrogen-oxygen generator over-consumes the electric energy of the battery, the present invention proposes a A system that produces hydrogen and oxygen on-board through a vehicle-mounted hydrogen and oxygen generator by recycling the surplus power of the internal combustion engine generator. The system controls the charging of the battery and the operation of the on-board hydrogen generator through the electronic control unit, avoiding the adverse effects on the life of the battery and the normal operation of the vehicle electrical system due to the continuous operation of the hydrogen generator. The system uses the excess electric energy of the vehicle generator to produce hydrogen and oxygen to realize energy recovery. The produced hydrogen and oxygen are independently supplied to the engine, which also avoids the danger of tempering caused by the premixing of hydrogen and oxygen in advance, and improves the stability of the system operation.

Description of drawings

Fig. 1 structure and working principle diagram of the present invention

1. Internal combustion engine; 2 Generator; 3 Electronic control unit; 4 Battery circuit relay; 5 Hydrogen generator circuit relay; 6 Battery; 7 Oxygen pressure sensor; 8 Oxygen storage tank; 9 Hydrogen pressure sensor; Vehicle-mounted oxygen generator; 12 Hydrogen pressure regulator; 13 Oxygen pressure regulator; 14 Hydrogen pipeline flame retardant valve; 15 Oxygen pipeline flame retardant valve

a Generator voltage signal; b hydrogen generator circuit relay control signal; c battery circuit relay control signal; d hydrogen pressure signal; e oxygen pressure signal; f battery voltage signal.

Detailed ways

Present embodiment has carried out following experiment on inline four-cylinder 1.6L gasoline engine:

According to the structure shown in Figure 1 before the experiment, a device for supplying hydrogen and oxygen from the residual power of the internal combustion engine to the vehicle-mounted hydrogen and oxygen production mechanism was built, and the signals of the generator voltage of the internal combustion engine and the battery voltage were respectively sent to the electronic control unit 3 by using shielded cables. During the experiment, the outlet pressures of the hydrogen pressure regulator 12 and the oxygen pressure regulator 13 installed in the system were both 2.5 bar. The maximum design pressure of hydrogen and oxygen storage tanks is 4bar. The experiments were carried out under idling and normal operating conditions of the internal combustion engine.

1 idle speed experiment

The experiment was first carried out under the idling condition of the internal combustion engine. The electronic control unit 3 detects that the generator voltage is 13.2V and the battery voltage is 13.7V through the generator voltage signal a and the battery voltage signal f. Since Vg<Vb at this time, the electronic control unit 3 sends out the control signals b and c to cut off the oxygen generator circuit relay 5 and the storage battery circuit relay 4 .

2 Normal working condition experiment

The working condition of the internal combustion engine is adjusted to 1400r/min, and the torque is 58Nm. The electronic control unit 3 detects that the generator voltage is 14.9V and the battery voltage is 13.9V through the generator voltage signal a and the battery voltage signal f. At this time Vg>Vb, but the battery voltage Vb is still lower than its full voltage Vf=14.5V. Therefore, the electronic control unit 3 sends a control signal b to cut off the hydrogen generator circuit relay 5, and sends a control signal c to switch on the battery circuit relay 4, so that the internal combustion engine generator 2 charges the battery 6.

After running for 5 minutes under the same internal combustion engine operating conditions, the electronic control unit 3 detects that the generator voltage is 14.9V and the battery voltage is 14.5V. At this time Vg>Vb, and the battery voltage reaches its full load voltage. At the same time, the electronic control unit 3 detects that the pressure of the hydrogen storage tank is 1.0 bar through the hydrogen pressure signal d, which is 4 bar lower than the design pressure of the hydrogen storage tank. Therefore, under this condition, the electronic control unit 3 sends a control signal c to cut off the battery circuit relay 4 to stop charging the battery 6, and sends a control signal b to connect the circuit relay 5 of the hydrogen generator to make the on-board hydrogen generator start to produce hydrogen and oxygen. After the on-board hydrogen generator runs for 10 minutes, it is detected that the pressure in the hydrogen and oxygen storage tanks is both 3bar, and the pressures of hydrogen and oxygen in the respective gas outlets of the system are respectively stable at the pressure set by the pressure regulator at 2.5bar.

After running for 15 minutes under the same internal combustion engine operating conditions, the electronic control unit 3 detects that both the pressure of the hydrogen storage tank and the pressure of the oxygen storage tank reach 4 bar. At this time, the electronic control unit cuts off the circuit relay 5 of the hydrogen and oxygen generator by sending the control signal b, so that the vehicle-mounted hydrogen and oxygen generator stops producing hydrogen and oxygen. Oxygen and hydrogen are still respectively stored in the oxygen storage tank 8 and the hydrogen storage tank 10, so at the hydrogen and oxygen outlets of the system, the pressures of hydrogen and oxygen are still stable at 2.5 bar.

The above-mentioned internal combustion engine bench test results show that a device for supplying hydrogen and oxygen for the vehicle-mounted hydrogen-oxygen machine by adopting the device provided by the present invention can effectively use the excess electric energy produced by the generator on the internal-combustion engine to provide energy for the vehicle-mounted hydrogen-oxygen machine , so that the on-board hydrogen generator can produce and store hydrogen and oxygen. At the same time, when the battery does not reach the full-load voltage, the electronic control unit 3 cuts off the circuit relay of the hydrogen-oxygen generator, and stops the vehicle-mounted hydrogen-oxygen generator 11 to produce hydrogen and oxygen, thus ensuring the normal power supply of the vehicle power system and effectively avoiding The adverse effect of excessive power consumption of the hydrogen and oxygen generator on the life of the battery.

Claims (4)

1. A device for supplying residual power of internal combustion engine to vehicle-mounted hydrogen-oxygen production mechanism, characterized in that: on the basis of retaining the internal combustion engine body (1) and all accessories, a set of vehicle-mounted hydrogen-oxygen machine control system and a set of hydrogen Oxygen production, storage and supply system, including: electronic control unit (3), vehicle-mounted hydrogen-oxygen generator (11), oxygen storage tank (8) connected with vehicle-mounted hydrogen-oxygen generator (11), and hydrogen storage tank ( 10), the oxygen pressure sensor (7) and the hydrogen pressure sensor (9) installed on the oxygen storage tank (8) and the hydrogen storage tank (10) respectively, and the oxygen pressure regulator (13) connected to the oxygen storage tank (8) ) and oxygen pipeline flame retardant valve (15), hydrogen pressure regulator (12) connected with hydrogen storage tank (10), hydrogen pipeline flame retardant valve (14), generator (2) and storage battery (6) A storage battery loop relay (4) is connected by a cable, and a hydrogen oxygen generator loop relay (5) is connected by a cable between the generator (2) and the oxygen generator (11); The electronic control unit (3) is connected with the internal combustion engine generator (2) to obtain the generator voltage signal a; the electronic control unit (3) is connected with the battery circuit relay (4) and the hydrogen generator circuit relay (5) respectively, through Send control signals c and b to respectively control the on-off of the battery circuit relay (4) and the oxygen generator circuit relay (5); the electronic control unit (3) is connected to the hydrogen pressure sensor (9) and the oxygen pressure sensor (7) respectively , to obtain the pressure signal d of the hydrogen storage tank and the pressure signal e of the oxygen storage tank; the electronic control unit (3) is connected with the battery (6) to obtain the battery voltage signal f; The internal combustion engine generator (2) is connected with the internal combustion engine body. 2. A device for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen-oxygen machine for producing hydrogen and oxygen according to claim 1, wherein the internal combustion engine includes a gasoline engine and a diesel engine. 3. A device for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen-oxygen machine for producing hydrogen and oxygen according to claim 1, wherein the electronic control unit (3) is connected to other components through a shielded cable. 4. The control method of an internal combustion engine emission control device based on a vehicle-mounted hydrogen and oxygen generator according to claim 1, wherein the control method comprises the following steps: A device for supplying residual power of an internal combustion engine to a vehicle-mounted hydrogen-oxygen production mechanism for hydrogen-oxygen gas first detects the generator voltage signal a and the battery voltage signal f, and is mainly divided into two types according to the relationship between the generator voltage Vg and the battery voltage Vb. Condition: 1) Vg=<Vb The electronic control unit (3) detects the internal combustion engine generator voltage signal a and the battery voltage signal f, and when Vg=<Vb, the electronic control unit (3) determines that the electric energy provided by the generator is not enough to charge the battery (6) and cannot provide Produce hydrogen by electrolyzing water to the vehicle-mounted oxygen generator (11). Therefore, when Vg=＜Vb, electronic control unit (3) sends control signal b, c to cut off storage battery circuit relay (4) and hydrogen-oxygen machine circuit relay (5) simultaneously; 2) Vg>Vb The electronic control unit (3) detects the internal combustion engine generator voltage signal a and the battery voltage signal f, and when the generator voltage is higher than the battery voltage, the electronic control unit (3) determines that the generator can charge the battery (6) at this time and provide The vehicle-mounted hydrogen-oxygen generator (11) produces hydrogen-oxygen; when Vg>Vb, it can be divided into two situations according to the relationship between the battery voltage Vb and the full-load voltage Vf of the battery: a) Vb<Vf In order to ensure the normal operation of the vehicle and the service life of the battery, when Vb<Vf, the electronic control unit (3) first ensures that the battery is charged; in the case of Vb<Vf, the electronic control unit (3) sends a control signal b to cut off the production of hydrogen and oxygen Machine loop relay (5), and send control signal c to connect the battery loop relay (4), so that all the electric energy produced by the generator is used for battery charging. b) Vb>=Vf When Vb>=Vf, the electronic control unit (3) judges that the accumulator has finished charging, and the surplus power produced during generator operation can be provided to the vehicle-mounted hydrogen-oxygen machine (11) to produce hydrogen and oxygen with the vehicle; at this time, The electronic control unit continues to detect the pressure signal d of the hydrogen storage tank and the pressure signal e of the oxygen storage tank. When the pressure of any storage tank of hydrogen or oxygen is greater than or equal to the maximum pressure (Ps) designed for the storage tank, in order to ensure the safe operation of the system, the electronic control unit (3) Send control signal b to cut off the circuit relay (5) of the hydrogen-oxygen generator, so that the vehicle-mounted hydrogen-oxygen generator (11) stops producing hydrogen and oxygen, and send a control signal c to cut off the battery circuit relay (4) to stop battery charging; When the pressure in any gas storage tank of hydrogen or oxygen is lower than Ps, the electronic control unit (3) sends a control signal c to cut off the battery circuit relay (4) to stop charging the battery, and sends a control signal b to connect the hydrogen generator circuit relay (5), all the excess electric energy produced when the generator is running is supplied to the vehicle-mounted hydrogen-oxygen machine (11) to produce hydrogen and oxygen; the hydrogen and oxygen obtained by the hydrogen-oxygen machine (11) are stored in the hydrogen storage tank respectively (10) and oxygen storage tank (8), and respectively through hydrogen pressure regulator (12), oxygen pressure regulator (13), hydrogen pipeline flame retardant valve (14) and oxygen pipeline flame retardant valve (15) It is delivered to the hydrogen and oxygen outlet of the system and provided to the vehicle.

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