Automatic oil-way control system for vehicle-mounted methanol catalytic cracking device

Abstract

An automatic oil circuit control system of a vehicle-mounted methanol catalytic cracking device is based on signals input by an ECU (electronic control unit) from a temperature sensor, a pressure sensor and an air flow meter to control the secondary air injection device, preheating device, oil pump, nozzle and The solenoid valve is automatically controlled, so that the hydrogen-rich gas and fuel cracked by the catalytic cracker can be mixed in different proportions under different operating conditions and speeds and then passed into the engine, so as to achieve the purpose of reducing engine exhaust. The invention has the advantages of small size, low cost, easy purchase of system components, low energy consumption, simple structure of the cracking device, low manufacturing cost, large normal working temperature range of the catalyst, long service life, high conversion rate and the like.

Description

[0001] Field [0002] The invention belongs to an automatic oil circuit control system of a vehicle-mounted methanol catalytic cracking device, in particular to a method for cracking methanol into hydrogen-rich gas (H 2 and CO) are mixed with air and fuel and then added to the automobile engine to reduce the content of harmful substances in the automobile exhaust. The oil circuit automatic control system of the methanol catalytic cracking device. Background technique: [0003] The technical level of motor vehicle emission control is an important factor in determining the amount of motor vehicle pollutant emissions. In addition, many factors such as vehicle use, maintenance, fuel quality, and environmental conditions will affect vehicle emissions. There are two types of methods for treating automobile exhaust: internal purification and external purification. Internal purification is achieved by improving the quality of the mixed gas, improving the combustion conditions and usin...

AI Technical Summary

Problems solved by technology

The use of fuel injection system is the best way to improve the quality of mixed gas. Although it can accurately control the amount of fuel entering the engine and improve the economy and power of the engine, it has high cost, complicated structure, and the reduction of tail exhaust is not obvious. Since the air-fuel ratio set by the electronic control system is always close to the theoretical air-fuel ratio, gasoline or diesel oil composed of different hydrocarbons cannot be completely combusted, HC compounds and CO are not significantly reduced, and the engine combustion temperature cannot be reduced. x It is not well treated; improving the combustion situation is an internal purification method that is considered from the aspects of gas distribution timing, ignition timing, combustion mode, and combustion chamber shape. This method is only based on the formation mechanism of various harmful substances. Adjusting the parameters of the engine itself makes its emissions as small as possible, but it cannot make its emissions meet the national emission standards; currently using low-pollution fuels (liquefied petroleum gas and hydrogen) as alternative fuels is the best way to reduce fuel consumption and pollution, while The gas cylinders required for liquefied petroleum gas and hydrogen are heavy, and the cylinders are frequently replaced and have the risk of explosion, so they have not been promoted; exhaust gas recirculation is also a widely used emission control measure, which is only effective for reducing NO x Effective, because the exhaust oxygen content is very low, mainly by the inert gas N 2 and CO 2 Composition, a part of the exhaust gas flows back to the intake system through the EGR valve, and after mixing with the fresh mixture, it dilutes the oxygen concentration in the fresh mixture, resulting in a decrease in combustion speed; at the same time, it also increases the specific heat capacity of the fresh mixture, these two The reason is that the combustion temperature is reduced, so the NO can be suppressed x , but the reduction of oxygen concentration makes HC and CO incomplete combustion, resulting in the increase of HC and CO emissions

[0004] At present, the three-way (Pt-Pd-Rh) catalytic method is mainly used for external purification. Although this method is theoretically feasible, there are many problems in actual use: 1) The catalyst has a small temperature range and is easy to be poisoned; 2) The catalyst used Most of them are precious metals, and the cost is high, which affects the popularization and use of catalytic reactors; 3) When using three-way catalysts, the composition of the mixed gas must be strictly controlled near the theoretical air-fuel ratio, so that the oxidation reaction of CO and HC and the oxidation reaction of NO x The reduction reaction is carried out at the same time, which is bound to effectively reduce CO, HC compounds and NO x 4) Due to the presence of the three metals at the same time, the full play of each other's activity is inhibited

At present, there are three technical problems in the use of hydrogen fuel that have not been resolved: 1) storage of hydrogen, because the weight ratio of hydrogen to gasoline with the same calorific value is 0.37, while the volume of gaseous hydrogen at room temperature is 3000 times that of liquid gasoline; 2) ) The density of hydrogen is low, and the method of introducing hydrogen into the intake port is easy to cause the intake port to temper; 3) The cost of hydrogen production is high

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