Solution: Check and clean up the shortcomings of start-up preheating. It is suggested that the machine is difficult to start, and the exhaust pipe emits black smoke during cold start.
The color of exhaust smoke during cold start in summer should be very light and almost invisible. It is normal to see the color of exhaust smoke during cold start in winter, but black smoke should never be emitted.
In the event of black smoke from exhaust, check the starting and preheating.
Disadvantages: battery voltage is too low, glow plug, fusible piece, open circuit and preheating controller fuse open circuit, start key switch shortcomings preheating controller shortcomings, glow plug and power feed shortcomings, diesel label is incorrect.
Disadvantages Check indicator light check When starting the suggestion machine, first turn the starting key switch to the starting preheating position. At this time, starting the preheating controller will initially work, and the preheating indicator should be on, indicating that the preheating controller and the glow plug are normal. Work.
If the preheating indicator is not on, the shortcomings of the preheating indicator should be cleaned first. Generally, the defects of the indicator damage are less, most of which are the shortcomings of the start-up preheating controller and the control circuit.
Check the battery voltage. The preheating indicator light is on or off to check the battery voltage.
When the glow plug enters the working condition, the power consumption of each glow plug is about Peng Nao, and the power consumption of each glow plug is about Wuqing. At this time, the battery voltage should be significantly lost, but the use and shortcomings of the glow plug should be cleaned and collected. The cold start of the car is recommended to warm up a glow plug. The Jiefang series of nine-ton flat-head diesel cars are equipped with in-line cylinder supercharged and intercooled diesel engines. The cold start arrangement is different from that of common series diesel engines. The cylinder head of each cylinder All of them are equipped with a cold start preheating glow plug, which is one of the advanced technologies of contemporary diesel engines. The glow plug plays a role in the sensitive start of cold cars and prevents black smoke from the exhaust of the recommended engine.
In addition to the conventional intake and exhaust valves and injectors, the cylinder head of the proposed engine is also equipped with a cold start preheating glow plug in the same direction as the injector equipment, and its front end extends into the combustion chamber.
The glow plug has a pen-shaped appearance, the pen barrel is equipped with a heating wire, the middle of the pen barrel has a fixed thread, and the end has a hexagonal head, which can be forcibly screwed into the cylinder head.
The metal shell at the end of the pen is a heater, which can sensitively heat the combustion chamber and reflect the oil mist sprayed from the injector from the bottom of the combustion chamber, and it will be sensitively heated when it falls on the surface of the end to make the mixture burn sensitively.
The heating wire is an electric heating coil surrounded by a spiral, and its resistance value is hardly affected by the heating temperature of the energization, but a piece of positive temperature coefficient thermistor wire is connected in series in the coil, and the resistance value becomes larger as the temperature increases after energization.
The power supply voltage of the diesel vehicle is that the resistance value is very small during cold start, and the energizing current is large, which plays a sensitive heating role.
After preheating, the resistance value of the resistance wire is larger and the energizing current is smaller, which appropriately reduces the heating temperature, which prevents the temperature from being too high, and also prolongs the life of the glow plug and saves the power supply of the battery.
The power consumption of each glow plug is about Yiqing, and it is clear that the heating effect can be reached without energizing the current exceeding the maximum temperature of the glow plug.
In the cold start circuit, the glow plug is controlled by the preheating controller and the start key switch. When the circuit is equipped with a separate glow plug fuse, it can only work when the battery is powered and the main power switch is closed.
