dpf regenerative thermal protection method

Abstract

The invention relates to a method for DPF regeneration heat protection, comprising the steps of: collecting intake air flow signal, differential pressure signal, DPF inlet temperature signal, SCR inlet temperature signal, neutral switch signal, handbrake signal, throttle signal, brake signal; detecting whether the DPF In the regeneration state, if it is in the regeneration state, check whether the regeneration heat protection is passed; if it passes, stop DPF regeneration, and then enter the regeneration heat protection mode; detect whether the regeneration heat protection exit judgment is passed, if passed, exit the regeneration heat protection model. The invention provides corresponding judgment conditions for the entry and exit of regenerative heat protection under different working conditions, which is more suitable for actual working conditions; the regenerative heat protection modes are classified, and the automatic switch between different types of modes is designed conditions, and can flexibly respond to changes in working conditions.

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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