DPF regenerated heat protection method

Abstract

The invention relates to a DPF regenerated heat protection method. The DPF regenerated heat method comprises the steps that an air inlet flow signal, a pressure difference signal, a DPF inlet temperature signal, an SCR inlet temperature signal, a neutral position switch signal, a hand brake signal, an accelerator signal and a brake signal are collected; whether a DPF is in a regeneration state ornot is detected, and if the DPF is in a regeneration state, whether regenerated heat protection judgment is passed or not is detected; if regenerated heat protection judgment is passed, DPF regeneration is stopped, and then a regenerated heat protection mode is started; and whether regenerated heat protection exit judgment is passed or not is detected, and if regenerated heat protection exit judgment is passed, the regenerated heat protection mode is stopped. Corresponding judgment conditions are provided for the entry and exit of regenerated heat protection under different working conditions,and the actual working condition requirements are better met; the regenerated heat protection modes are classified, automatic switching conditions between different types of modes are designed, and the change conditions of the working conditions can be flexibly handled.

Description

technical field [0001] The invention relates to the technical field of DPF regeneration control, in particular to a method for DPF regeneration heat protection. Background technique [0002] With the upgrading of diesel engine emission regulations, the requirements of the engine for the aftertreatment system are becoming more and more stringent. Among them, DPF is the main means to reduce particulate matter emissions. With the accumulation of particulate matter, the exhaust back pressure gradually increases, and the power and economy of the engine will be affected. Therefore, it must be regenerated. [0003] The current mainstream DPF regeneration solution is to inject fuel into the front of the DOC, and release a large amount of heat through the DOC to oxidize the fuel, thereby oxidizing the particulate matter and achieving the effect of regeneration. The disadvantages of this approach are: [0004] During the regeneration process, the particulate matter will release a ...

AI Technical Summary

Problems solved by technology

[0006] 1. The introduction of high-pressure gas in the front section of the DPF will cause the engine back pressure to rise suddenly, affecting the normal operation of the engine;

[0007] 2. It is necessary to add corresponding actuators and gas storage tanks, etc., which will increase the cost of the whole machine

[0009] Only protected against sudden return to idling speed, lack of protection for other extreme working conditions

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