The starting of the engine must be under the condition that the whole vehicle is powered and the control unit is powered on. The battery voltage meets the specified parameters of the engine. In order to ensure a smooth start at low temperatures, the battery capacity and discharge capacity should be similar to those of similar models. Only work 5 minutes when 36V high voltage.
Remember to turn off the main power switch (or turn off the ignition switch) before pulling and inserting the harness and its sensor, actuator, and controller connections. Otherwise, it will cause the control unit (ECU) to generate a memory, form a fault code and store it, so that the engine enters a failure protection strategy and reduces the power of the engine.
Clean the engine harness regularly with a clean, soft cloth to accumulate oil and dust to keep the harness and its connection to the sensor and actuator dry and clean.
Since most of the plugs are made of plastic material, barbaric operation is prohibited during installation, ensuring that the locking device is in place and that there are no foreign objects in the socket.
Whether the exhaust brake is installed, whether the air-conditioner is controlled by the ECU, whether the starter needs ECU control, whether to use cruise control, etc., it is necessary to negotiate with the auto manufacturer when the vehicle is equipped. If the user sometimes installs air-conditioner privately, the ECU cannot receive the request. The signal, without idling, has caused idling instability.
Control units (ECUs) cannot be interchanged at will, and models and engines of the same model can be interchanged under the same conditions.
In the case of modified and self-contained air-conditioning engines, the control system EECU will have a controlled command and need to change the brush data again.
When replacing the injector and pressure pump assembly of the control system, the oil volume of the high-power engine varies greatly, and the IQA code needs to be re-entered. Otherwise, the control system execution unit is controlled and the performance of the engine changes.
Pyridine, an organic compound with the chemical formula C5H5N, is a six-membered heterocyclic compound containing a nitrogen heteroatom. It can be regarded as a compound in which one (CH) in the benzene molecule is substituted by N, so it is also called nitrobenzene. It is a colorless or slightly yellow liquid with a stench.
Foreign name: pyridine
Alias: Azabenzene
Chemical formula: C5H5N
Molecular weight: 79.102
CAS login number: 110-86-1
EINECS accession number: 203-809-9
Melting point: -41.6 ℃
Boiling point: 15.3℃
Water soluble: Soluble
Density: 0.983 g/cm³
Exterior: Colorless liquid
Flash point: 20 ℃ (closed)
Application: Used in the manufacture of vitamins, sulfonamides, pesticides and plastics, etc.
Security description: S7; S16; S22; S24/25; S26; S28; S36/37/39; S38; S45; S61
Hazard Symbols: F; Xn
Hazard description: R11; R20/21/22
UN Dangerous Goods Number: 1282
Physical properties:
Melting point: -41.6℃
Boiling point: 115.3℃
Flash point: 20℃
Density: 0.983g/cm3
Ignition temperature: 482℃
Upper explosion limit (V/V): 12.4%
Lower explosion limit (V/V): 1.7%
Critical temperature (℃): 346.85
Critical pressure (MPa): 6.18
Refractive index: 1.509 (20℃)
Appearance: colorless liquid
Solubility: Miscible with water, alcohol, ether, petroleum ether, benzene, oil and other solvents
Chemical properties:
Pyridine and its derivatives are more stable than benzene, and their reactivity is similar to that of nitrobenzene. Typical aromatic electrophilic substitution reactions occur at the 3 and 5 positions, but the reactivity is lower than that of benzene, and nitration, halogenation, sulfonation and other reactions are generally not easy to occur. Pyridine is a weak tertiary amine that can form water-insoluble salts with various acids (picric acid or perchloric acid, etc.) in ethanol solution. The pyridine used in industry contains about 1% of 2-methylpyridine, so it can be separated from its homologues by taking advantage of the difference in salt-forming properties. Pyridine can also form crystalline complexes with various metal ions. Pyridine is easier to reduce than benzene, such as reducing to hexahydropyridine (or piperidine) under the action of metal sodium and ethanol. Pyridine reacts with hydrogen peroxide and is easily oxidized to N-pyridine oxide.
Application
It is used in the manufacture of vitamins, sulfonamides, pesticides and plastics; it can also be used as an alkaline solvent, and it is also an excellent solvent for deacidification and acylation reactions; it can also be used as a carbonyl group for polymerization, oxidation, and acrylonitrile. It can also be used as a catalyst for chemical reactions, etc.; it can also be used as a silicone rubber stabilizer, a raw material for anion exchange membranes, etc.
3-Bromopyridine,4-Methoxypyridine,Intermediates 2-Chloro-3-formyl-6-picoline,5-Bromo-2-methyl-3-nitropyridine
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