A method for regenerating idle speed of non-road National IV diesel vehicles after treatment

Abstract

This invention discloses a method for improving the idling speed of non-road Euro IV diesel fuel aftertreatment during driving regeneration, comprising the following steps: determining that the engine is in driving regeneration mode, confirming that the engine speed is lower than the driving regeneration idle speed plus a certain speed, and that the T5 temperature is lower than a first preset temperature, thus meeting the enabling conditions; when the continuous idling time is greater than the set long idling time, the function of improving the driving regeneration idle speed is activated, thereby increasing the driving regeneration temperature by increasing the idle speed. This invention has the advantages of being able to complete driving regeneration while operating at idle speed, and having low emissions during the regeneration process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of post-processing, in particular to a method for improving non-road fourth-stage diesel post-processing driving regeneration idle speed. BACKGROUND

[0002] At present, non-road diesel engines in our country have implemented the fourth-stage emission regulations, and the regulations have strict requirements on particles and particle numbers. In order to meet the requirements, a DPF (diesel particulate filter) must be used. In order to ensure the normal use of the DPF component, the DPF needs to be regenerated according to the calibration method, and the performance of the DPF needs to be reactivated. However, the working conditions of some users in the submarket are in idle speed operation, which leads to the failure to complete driving regeneration, and the users do not perform parking regeneration, which eventually leads to the DPF serious blockage fault.

[0003] The disclosure of the above background art content is only used to assist in understanding the concept and technical solutions of the present application, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0004] The present application aims to solve the technical problem that some users in the submarket cannot complete driving regeneration when the working conditions are in idle speed operation.

[0005] To this end, the present application provides a method for improving non-road fourth-stage diesel post-processing driving regeneration idle speed.

[0006] Preferably, the present application can also have the following technical features:

[0007] A method for improving non-road fourth-stage diesel post-processing driving regeneration idle speed, comprising the following steps:

[0008] Determine that the engine is in driving regeneration mode, determine that the engine speed is lower than the value of the driving regeneration idle speed plus a certain speed, and the T5 temperature is lower than the first preset temperature, to meet the enabling condition;

[0009] When the continuous idle speed operation time is greater than the set long idle speed time, the driving regeneration idle speed function is activated, and the driving regeneration temperature is improved by increasing the idle speed.

[0010] Further, the certain speed is in the range of 40-60 r / min.

[0011] Further, the certain speed is 50 r / min.

[0012] Further, the driving regeneration idle speed plus a certain speed indicates that the speed interval within the certain speed above the upper limit of the engine idle speed interval is still regarded as the idle speed when driving regeneration is performed.

[0013] Further, the first preset temperature is 520 DEG C.

[0014] Further, the range of the idle speed increase speed is determined according to the T5 temperature condition of the engine bench test, so that the driving regeneration temperature is gradually increased to above the first preset temperature.

[0015] Further, the long idle speed time is 2-4 min.

[0016] Further, the long idle speed time is 3 min.

[0017] Further, the idle speed increase speed is 20-30% higher than the idle speed of the engine during driving regeneration.

[0018] Further, one or more of the following conditions is met: the vehicle is switched off, the throttle opening is greater than 5% or the regeneration is successful, i.e., the driving regeneration idle speed increase mode is exited.

[0019] The beneficial effects of the present application compared with the prior art include: when the engine is in the driving regeneration mode, the upper limit of the idle speed interval is increased by the instruction, and the ECU regards the speed within a certain range above the upper limit of the idle speed interval as the engine still being in the idle speed, thereby avoiding the influence of the temporarily broken idle speed upper limit by the fluctuating speed on the continuous timing of the idle speed, ensuring low emission during the driving regeneration process, and clean and environmentally friendly. After the scheme of the present application enters the driving regeneration mode, the ECU can automatically increase the driving regeneration idle speed when the user runs at the speed near the idle speed for a long time, so that the vehicle successfully completes the driving regeneration. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a flowchart of the present application. DETAILED DESCRIPTION

[0021] The present application will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present application and its applications.

[0022] With reference to the following drawings, non-limiting and non-exclusive embodiments will be described, in which the same reference numerals denote the same parts, unless otherwise specified.

[0023] As Figure 1 shown in one non-road national fourth diesel engine driving regeneration idle speed increasing method, comprising:

[0024] The engine is determined to be in the on-road regeneration mode, the engine speed is determined to be lower than the on-road regeneration idle speed plus 40-60 r / min, preferably 50 r / min, and the T5 temperature (i.e. the DPF temperature) is determined to be lower than 520 ℃, thereby meeting the enabling condition.

[0025] In this step, the on-road regeneration idle speed plus 50 r / min means that the speed range within 50 r / min above the upper limit of the engine idle speed range is still regarded as the idle speed during on-road regeneration. For example, assuming that the engine idle speed range is 0-750 r / min, the upper limit is 750 r / min, and the engine is just running at the idle speed during on-road regeneration, the speed within 50 r / min above the upper limit of the engine idle speed range is still determined to be the idle speed by the idle speed plus 50 r / min instruction, i.e. the engine speed is in the range of 750-800 r / min, which is also determined to be the idle speed by the ECU. In actual working conditions, the speed of some market segment users fluctuates when the engine is running at the idle speed, and the speed may break through the idle speed range for a short time at a certain moment, which may interrupt the continuous idle time obtained by the ECU and is not conducive to the accumulation of the idle continuous working time. In this scheme, when the engine is in the on-road regeneration mode, the upper limit of the idle speed range is increased by the instruction, and the ECU regards the speed above the upper limit of the idle speed range as the idle speed of the engine, thereby avoiding the influence of the fluctuating speed on the continuous timing of the idle speed when the speed breaks through the upper limit of the idle speed range for a short time.

[0026] When the continuous idle running time is greater than the set long idle time, the on-road regeneration idle speed function is activated, and the on-road regeneration temperature is increased by increasing the idle speed.

[0027] In this step, the idle speed increase range is determined according to the T5 temperature of the engine bench test, so that the on-road regeneration temperature is gradually increased to above 520 ℃. If the engine is running at the idle speed during on-road regeneration, the on-road regeneration temperature cannot be increased, the HC emission is high, and the environment is polluted. The on-road regeneration temperature is increased by increasing the idle speed.

[0028] More specifically, the long idle time is 2-4 min, preferably 3 min. For market segment products running at the idle speed, the ECU captures the continuous idle running of the products for 2-4 min in the on-road regeneration mode, which meets the long idle time requirement, and then the idle speed is increased. The idle speed increase is 20-30% of the idle speed of the engine running during on-road regeneration, for example, if the idle speed of the engine running during on-road regeneration is X, the increased engine speed is {X+X(20-30%)}.

[0029] The on-road regeneration idle speed increase mode is exited by the following modes: the whole vehicle is powered off, the throttle opening is greater than 5%, and the regeneration is successful.

[0030] Those skilled in the art will realize that many modifications can be made to the described embodiments, and that the embodiments and examples chosen are merely given by way of illustration of one or more particular embodiments.

[0031] While there have been described herein the principles of the application in connection with specific embodiments thereof, it is to be understood that this application is capable of further modifications. This application is intended to cover any variations, uses or adaptations of the application including such departures from the present disclosure as come within known or customary practice in the art to which the application pertains. Therefore, the true scope of the application should not be limited to the foregoing description, but should be given to the full breadth of the following claims.

Claims

1. A method of non-road stage IV diesel aftertreatment on-boost post-processing drive regeneration idle, characterized in that, Comprising the following steps: Determine that the engine is in the driving regeneration mode, determine that the engine speed is lower than the driving regeneration idle speed plus a certain speed value, and the T5 temperature is lower than the first preset temperature, to reach the enabling condition; The driving regeneration idle speed plus a certain speed means that the speed interval within a certain speed above the upper limit of the engine idle speed interval is still considered as the idle speed during driving regeneration, so as to avoid the influence of the transient speed exceeding the upper limit of the idle speed on the continuous timing of the idle speed, and ensure the low emission of the driving regeneration process; The first preset temperature is 520℃; The T5 temperature is the DPF temperature; When the continuous idle running time is greater than the set long idle time, the driving regeneration idle speed function is activated, and the driving regeneration temperature is increased by increasing the idle speed; The amplitude of the idle speed increase is determined according to the T5 temperature of the engine bench test, so that the driving regeneration temperature gradually increases to above the first preset temperature.

2. A method of non-road phase IV diesel post-treatment on-board regeneration idle speed as recited in claim 1, characterized by: The certain speed is 40-60r / min.

3. A method of non-road stage IV diesel post-treatment on-board regeneration idle speed as recited in claim 2, characterized by: The certain speed is 50r / min.

4. A method of non-road phase 4 diesel post-ascension aftertreatment on-the-go idle speed regeneration as recited in claim 1 wherein: The long idle time is 2-4min.

5. A method of non-road stage IV diesel post-treatment on- the- hoik motoring idle speed for on-board regeneration as recited in claim 4, characterized by: The long idle time is 3min.

6. A method of non-road phase 4 diesel post-ascension aftertreatment on-the-go idle speed regeneration as recited in claim 1 wherein: The idle speed increase is 20-30% higher than the engine running idle speed during driving regeneration.

7. A method of non-road phase 4 diesel post-ascension aftertreatment on-the-go idle speed regeneration as recited in claim 1 wherein: Satisfy one or more of the three conditions of vehicle switch power-off, throttle opening greater than 5% or successful regeneration, that is, exit the driving regeneration idle speed increase mode.

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