System and method for judging whether DPF device is close to full load or not so as to achieve timely start regeneration

Abstract

The invention provides a system for preventing overheating of a DPF device. The system comprises an oil consumption metering value, a timer, a mileage calculator, an optimization prevention controller, a basic prevention controller and a master control unit. The optimization prevention controller is configured to be used for calculating an oil consumption factor, an engine operation duration factor and a vehicle driving mileage factor and setting the maximum factor as a maximum optimization factor. The basic prevention controller is configured to be used for obtaining a carbon loading factor. The master control unit configured to be used for setting the larger one of the maximum optimization factor and the carbon loading factor as a prevention factor when an optimization prevention module is started being used or setting the carbon loading factor as the prevention factor when the module is forbidden; and the prevention factor is compared with a factor upper limit and a factor lower limit, an engine torque limiting function is triggered when the prevention factor exceeds the factor upper limit, the function is forbidden when the prevention factor is equal to or smaller than the factor lower limit, and the triggering state of the function is kept unchanged when the prevention factor is between the factor upper limit and the factor lower limit. The invention further discloses a method using the system.

Description

technical field [0001] This application relates to the field of exhaust aftertreatment of vehicle engines, especially diesel engines, and in particular to judging whether a diesel carbon particulate filter (Diesel Particulate Filter, DPF for short) device configured in a vehicle exhaust aftertreatment system is close to full load and timely Systems and methods for initiating regeneration. Background technique [0002] It is well known that a DPF device is provided in an exhaust gas aftertreatment system of a vehicle engine for trapping carbon particulate matter from the exhaust gas of the engine before it is discharged into the atmosphere. As the carbon particles trapped in the DPF device gradually increase, the back pressure of the engine gradually increases, and the power of the engine will be affected. In order to remove the carbon particles trapped in the DPF, it is necessary to burn off the carbon particles in the DPF device by heating the exhaust gas. This process is ...

AI Technical Summary

Problems solved by technology

Thus, if the carbon load model deviates from the actual carbon load in the DPF unit, the carbon load obtained based on this model will not be accurate

If the obtained carbon load is not accurate, the engine's torque limiting function may be triggered inaccurately or too frequently, and may also cause a delay in the activation of this function

In the event of a delayed triggering of the engine torque limiting function, the DPF unit may not regenerate until a severe overload, which has an even more serious risk of overheating, possibly burning out the DPF unit

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