阅读说明：本技术 一种车辆dpf主动再生触发控制方法及系统 (Vehicle DPF active regeneration triggering control method and system ) 是由 楼狄明 张允华 余玉麒 谭丕强 胡志远 房亮 于 2021-07-30 设计创作，主要内容包括：本发明涉及一种车辆DPF主动再生触发控制方法及系统,方法包括：根据DPF入口处的当前温度信息计算温度修正因子；根据柴油发动机的当前运行工况确定工况修正因子；实时采集柴油发动机的循环喷油量,实时计算实际总油耗量增长率、修正总油耗量和循环喷油量增长率,实时判断是否满足以下任一条件：所述的循环喷油量增长率大于第一阈值；所述的实际总油耗量增长率大于第二阈值；所述的修正总油耗量大于第三阈值；若是,则启动DPF的主动再生过程,否则不启动DPF的主动再生过程。与现有技术相比,本发明提高了对于DPF主动再生时机的精确度,改进了DPF的再生效果,提高了柴油发动机的经济性和动力性。(The invention relates to a vehicle DPF active regeneration triggering control method and a vehicle DPF active regeneration triggering control system, wherein the method comprises the following steps: calculating a temperature correction factor according to the current temperature information at the inlet of the DPF; determining a working condition correction factor according to the current operating condition of the diesel engine; the method comprises the following steps of collecting the circulating fuel injection quantity of the diesel engine in real time, calculating the actual total fuel consumption increase rate, correcting the total fuel consumption and the circulating fuel injection quantity increase rate in real time, and judging whether any one of the following conditions is met or not in real time: the increase rate of the circulating fuel injection quantity is greater than a first threshold value; the actual total oil consumption increase rate is larger than a second threshold value; the corrected total oil consumption is larger than a third threshold value; if so, the active regeneration process of the DPF is started, otherwise, the active regeneration process of the DPF is not started. Compared with the prior art, the method improves the precision of the DPF active regeneration time, improves the regeneration effect of the DPF, and improves the economy and the dynamic property of the diesel engine.)

1. A vehicle DPF active regeneration triggering control method, comprising:

determining a working condition correction factor and a temperature correction factor according to the current operating condition of the diesel engine;

collecting the circulating fuel injection quantity of the diesel engine in real time, and calculating the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein，Q_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

judging whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is greater than a first threshold value;

the actual total oil consumption increase rate is larger than a second threshold value;

the corrected total oil consumption is larger than a third threshold value;

if so, the active regeneration process of the DPF is started, otherwise, the active regeneration process of the DPF is not started.

2. The method as claimed in claim 1, wherein the determining of the condition correction factor and the temperature correction factor comprises:

determining the working condition state of the vehicle, wherein the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁The temperature correction factor is theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂The temperature correction factor is theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

3. The method as claimed in claim 2, wherein the determining of the vehicle condition state comprises:

acquiring the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, judging that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, judging that the working condition state of the vehicle is an idling working condition state;

and when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, judging that the vehicle working condition state is the running working condition state.

4. The method as claimed in claim 2, wherein the intensity determining step comprises:

acquiring the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃The temperature correction factor is theta₃；

When the diesel engine is in a low rotating speed and a medium load, the working condition correction factor is beta₄The temperature correction factor is theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅The temperature correction factor is theta₅；

When the diesel engine is in middle speed and small load, the correction factor of the working condition is beta₆The temperature correction factor is theta₆；

When the diesel engine is in the middle rotating speed and the middle load, the working condition correction factor is beta₇The temperature correction factor is theta₇；

When the diesel engine is in middle speed and large load, the correction factor of the working condition is beta₈Said temperature beingDegree correction factor of theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉The temperature correction factor is theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀The temperature correction factor is theta₁₀；

When the diesel engine is in a large rotating speed and a large load, the working condition correction factor is beta₁₁The temperature correction factor is theta₁₁。

5. The method as claimed in claim 4, wherein the calibration of β is based on the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

6. A vehicle DPF active regeneration triggering control system, comprising:

the working condition correction module is used for determining a working condition correction factor and a temperature correction factor according to the current operating working condition of the diesel engine;

the trigger control module comprises a computing unit and a trigger unit;

the calculation unit acquires the circulating fuel injection quantity of the diesel engine in real time according to the temperature correction factor and the working condition correction factor and calculates the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein Q is_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

the trigger unit judges whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is greater than a first threshold value;

the actual total oil consumption increase rate is larger than a second threshold value;

the corrected total oil consumption is larger than a third threshold value;

if so, the active regeneration process of the DPF is started, otherwise, the active regeneration process of the DPF is not started.

7. The system as claimed in claim 6 wherein the determination of the condition correction factor and the temperature correction factor comprises:

the working condition correction module determines the working condition state of the vehicle, wherein the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁The temperature correction factor is theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂The temperature correction factor is theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

8. The system as claimed in claim 7, wherein the determination of the vehicle operating condition state comprises:

the working condition correction module acquires the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, the working condition correction module judges that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, the working condition correction module judges that the working condition state of the vehicle is an idling working condition state;

and when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, the working condition correction module judges that the vehicle working condition state is the running working condition state.

9. The system as claimed in claim 7, wherein the intensity determining step comprises:

the working condition correction module acquires the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃The temperature correction factor is theta₃；

When the diesel engine is in a low rotating speed and a medium load, the working condition correction factor is beta₄The temperature correction factor is theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅The temperature correction factor is theta₅；

When the diesel engine is in middle speed and small load, the correction factor of the working condition is beta₆The temperature correction factor is theta₆；

When the diesel engine is in the middle rotating speed and the middle load, the working condition correction factor is beta₇The temperature correction factor is theta₇；

When the diesel engine is in middle speed and large load, the correction factor of the working condition is beta₈The temperature correction factor is theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉The temperature correction factor is theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀The temperature correction factor is theta₁₀；

When the diesel engine is in a large rotating speed and a large load, the working condition correction factor is beta₁₁The temperature correction factor is theta₁₁。

10. The system as claimed in claim 9, further comprising a modified calibration module, wherein the modified calibration module is configured to calibrate the DPF when the DPF is actively regeneratedThe block is calibrated by the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

Technical Field

The invention relates to the technical field of engine emission, in particular to a vehicle DPF active regeneration triggering control method and a vehicle DPF active regeneration triggering control system.

Background

As a main power source of an automobile, the diesel engine has the characteristics of high thermal efficiency, low oil consumption, good adaptability and the like. Especially in the field of medium and heavy vehicle power, diesel engines occupy an absolute preponderance. However, the diesel engine has a high particulate matter emission level, and is especially important for research and control of diesel engine particulate matter emission based on an environmental protection concept.

A Diesel Particulate Filter (DPF) is used as a key part of a Diesel engine after-treatment system, and can intercept and Filter Particulate matters of a Diesel engine, so that the Particulate matter emission is reduced. As particulate matter deposits in the DPF can cause increased engine exhaust backpressure, decreased power and increased oil consumption, which can affect engine economy, and timely DPF regeneration is desirable. For the determination of the DPF active regeneration timing, chinese patent 201810834660.8 and chinese patent 201611166838.3 respectively realize the control of DPF regeneration by measuring the pressure drop before and after the DPF and the vehicle driving distance. However, in terms of practicality, there are the following drawbacks:

DPF pressure drop signal exists undulantly under the operating mode of unsteady state, there is certain difficulty to accurate monitoring pressure drop signal, the vehicle is at the in-process that traveles of reality, because the operating condition is different, even through the same mileage of traveling, DPF deposit carbon loading capacity probably has great difference, the problem of too early regeneration or too late regeneration can appear, too early regeneration can lead to the cost of regeneration to increase, too late regeneration can lead to the DPF carbon deposit too much and burn out, the precision of DPF active regeneration opportunity is relatively poor.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a vehicle DPF active regeneration triggering control method and a vehicle DPF active regeneration triggering control system, so that the precision of DPF active regeneration timing is improved, the regeneration effect of a DPF is improved, and the economy and the dynamic property of a diesel engine are improved.

The purpose of the invention can be realized by the following technical scheme:

a vehicle DPF active regeneration triggering control method comprising:

determining a working condition correction factor and a temperature correction factor according to the current operating condition of the diesel engine;

collecting the circulating fuel injection quantity of the diesel engine in real time, and calculating the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein Q is_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

judging whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is greater than a first threshold value;

the actual total oil consumption increase rate is larger than a second threshold value;

the corrected total oil consumption is larger than a third threshold value;

if yes, starting the active regeneration process of the DPF, otherwise, not starting the active regeneration process of the DPF;

the DPF active regeneration is controlled from the perspective of oil consumption, the total oil consumption is calculated and corrected according to the difference of particulate matters generated by each unit of fuel under different working conditions and the exhaust temperature difference, the control precision during DPF active regeneration is improved, the influence of unsteady working condition fluctuation on a measurement result is avoided, a judgment mode combining the cyclic fuel injection quantity growth rate and the total oil consumption growth rate is provided, the stability of a DPF active regeneration system is improved, the influence of accidental factors on a DPF regeneration triggering process is reduced, the probability of DPF too-early regeneration or too-late regeneration is effectively reduced, the DPF regeneration effect is improved, and the economy and the dynamic property of a diesel engine are improved.

Further, the determining process of the working condition correction factor and the temperature correction factor comprises the following steps:

determining the working condition state of the vehicle, wherein the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁The temperature correction factor is theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂The temperature correction factor is theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

Further, the determining process of the vehicle operating condition state comprises the following steps:

acquiring the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, judging that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, judging that the working condition state of the vehicle is an idling working condition state;

and when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, judging that the vehicle working condition state is the running working condition state.

Further, the strength judging step includes:

acquiring the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃The temperature correction factor is theta₃；

When the diesel engine is in a low rotating speed and a medium load, the working condition correction factor is beta₄The temperature correction factor is theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅The temperature correction factor is theta₅；

When the diesel engine is in middle speed and small load, the correction factor of the working condition is beta₆The temperature correction factor is theta₆；

When the diesel engine is in the middle rotating speed and the middle load, the working condition correction factor is beta₇The temperature correction factor is theta₇；

When the diesel engine is in middle speed and large load, the correction factor of the working condition is beta₈The temperature correction factor is theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉The temperature correction factor is theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀The temperature correction factor is theta₁₀；

When the diesel engine is at a high rotating speed and a high rotating speedUnder load, the correction factor of the working condition is beta₁₁The temperature correction factor is theta₁₁。

Further, β is calibrated by the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

A vehicle DPF active regeneration trigger control system comprises a working condition correction module and a trigger control module;

the working condition correction module is used for determining a working condition correction factor and a temperature correction factor according to the current operating working condition of the diesel engine;

the trigger control module comprises a computing unit and a trigger unit;

the calculation unit acquires the circulating fuel injection quantity of the diesel engine in real time according to the temperature correction factor and the working condition correction factor and calculates the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein Q is_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

the trigger unit judges whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is greater than a first threshold value;

the actual total oil consumption increase rate is larger than a second threshold value;

the corrected total oil consumption is larger than a third threshold value;

if yes, starting the active regeneration process of the DPF, otherwise, not starting the active regeneration process of the DPF;

the DPF active regeneration is controlled from the perspective of oil consumption, the total oil consumption is calculated and corrected according to the difference of particulate matters generated by each unit of fuel under different working conditions and the exhaust temperature difference, the control precision during DPF active regeneration is improved, the influence of unsteady working condition fluctuation on a measurement result is avoided, a judgment mode combining the cyclic fuel injection quantity growth rate and the total oil consumption growth rate is provided, the stability of a DPF active regeneration system is improved, the influence of accidental factors on a DPF regeneration triggering process is reduced, the probability of DPF too-early regeneration or too-late regeneration is effectively reduced, the DPF regeneration effect is improved, and the economy and the dynamic property of a diesel engine are improved.

Further, the determining process of the working condition correction factor and the temperature correction factor comprises the following steps:

the working condition correction module determines the working condition state of the vehicle, wherein the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁The temperature correction factor is theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂The temperature correction factor is theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

Further, the determining process of the vehicle operating condition state comprises the following steps:

the working condition correction module acquires the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, the working condition correction module judges that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, the working condition correction module judges that the working condition state of the vehicle is an idling working condition state;

and when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, the working condition correction module judges that the vehicle working condition state is the running working condition state.

Further, the strength judging step includes:

the working condition correction module acquires the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃The temperature correction factor is theta₃；

When the diesel engine is in a low rotating speed and a medium load, the working condition correction factor is beta₄The temperature correction factor is theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅The temperature correction factor is theta₅；

When the diesel engine is in middle speed and small load, the correction factor of the working condition is beta₆The temperature correction factor is theta₆；

When the diesel engine is in the middle rotating speed and the middle load, the working condition correction factor is beta₇The temperature correction factor is theta₇；

When the diesel engine is in middle speed and large load, the correction factor of the working condition is beta₈The temperature correction factor is theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉The temperature correction factor is theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀The temperature correction factor is theta₁₀；

When the diesel engine is in a large rotating speed and a large load, the working condition correction factor is beta₁₁The temperature correction factor is theta₁₁。

Further, the device also comprises a correction calibration module, wherein the correction calibration module calibrates beta through the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

Compared with the prior art, the invention has the following beneficial effects:

according to the method, the DPF active regeneration is controlled from the perspective of oil consumption, and the total oil consumption is calculated and corrected according to the difference of particulate matters generated by each unit of fuel under different working conditions and the difference of exhaust temperature, so that the control precision of the machine handle during the DPF active regeneration is improved, and the influence of unsteady working condition fluctuation on the measurement result is avoided; the judgment mode that the circulation fuel injection quantity growth rate and the total fuel consumption growth rate are combined is provided, the stability of the DPF active regeneration system is improved, the influence of accidental factors on the DPF regeneration triggering process is reduced, the probability of the premature regeneration or the late regeneration of the DPF is effectively reduced, the DPF regeneration effect is improved, and the economy and the dynamic property of the diesel engine are improved.

Drawings

FIG. 1 is a schematic flow chart of the method of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

A method for active regeneration triggering control of a DPF in a vehicle, as shown in fig. 1, comprising:

determining a working condition correction factor and a temperature correction factor according to the current operating condition of the diesel engine;

collecting the circulating fuel injection quantity of the diesel engine in real time, and calculating the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein Q is_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

judging whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is larger than a first threshold value;

the actual total oil consumption increase rate is greater than a second threshold;

correcting the total oil consumption to be larger than a third threshold value;

if yes, starting the active regeneration process of the DPF, otherwise, not starting the active regeneration process of the DPF;

the DPF active regeneration is controlled from the perspective of oil consumption, the total oil consumption is calculated and corrected according to the difference of particulate matters generated by each unit of fuel under different working conditions and the exhaust temperature difference, the control precision during DPF active regeneration is improved, the influence of unsteady working condition fluctuation on a measurement result is avoided, a judgment mode combining the cyclic fuel injection quantity growth rate and the total oil consumption growth rate is provided, the stability of a DPF active regeneration system is improved, the influence of accidental factors on a DPF regeneration triggering process is reduced, the probability of DPF too-early regeneration or too-late regeneration is effectively reduced, the DPF regeneration effect is improved, and the economy and the dynamic property of a diesel engine are improved.

The determination process of the working condition correction factor and the temperature correction factor comprises the following steps:

determining the working condition state of the vehicle, wherein the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁Temperature correction factor of theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂Temperature correction factor of theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

The determination process of the vehicle working condition state comprises the following steps:

acquiring the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, judging that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, judging that the working condition state of the vehicle is an idling working condition state;

and when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, judging that the vehicle working condition state is the running working condition state.

The strength judging step comprises the following steps:

acquiring the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃Temperature correction factor of theta₃；

When the diesel engine is in placeAt low speed and medium load, the correction factor of working condition is beta₄Temperature correction factor of theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅Temperature correction factor of theta₅；

When the diesel engine is at medium speed and small load, the correction factor of the working condition is beta₆Temperature correction factor of theta₆；

When the diesel engine is at middle speed and load, the correction factor of working condition is beta₇Temperature correction factor of theta₇；

When the diesel engine is at medium rotating speed and large load, the working condition correction factor is beta₈Temperature correction factor of theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉Temperature correction factor of theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀Temperature correction factor of theta₁₀；

When the diesel engine is in large rotating speed and large load, the working condition correction factor is beta₁₁Temperature correction factor of theta₁₁。

Calibrating beta by the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

The vehicle DPF active regeneration triggering control method is realized based on a vehicle DPF active regeneration triggering control device, the vehicle DPF active regeneration triggering control device comprises a GPF front temperature sensor, a torque sensor, a crankshaft position sensor and a position sensor, the GPF front temperature sensor is used for determining the temperature of a GPF front inlet, the torque sensor is used for determining the load of a diesel engine, the crankshaft position sensor is used for determining the rotating speed of the diesel engine, and the position sensor is used for detecting the opening degrees of an accelerator pedal, a clutch pedal and a brake pedal.

Example 2

A vehicle DPF active regeneration trigger control system comprises a working condition correction module and a trigger control module;

the working condition correction module is used for determining a working condition correction factor and a temperature correction factor according to the current operating working condition of the diesel engine;

the trigger control module comprises a calculation unit and a trigger unit;

the calculation unit collects the circulating fuel injection quantity of the diesel engine in real time according to the temperature correction factor and the working condition correction factor and calculates the actual total fuel consumption increase rate eta in real time_QCorrecting the total fuel consumption Q_reAnd the increase rate eta of the fuel injection quantity_qThe calculation formula is as follows:

Q_i＝∑q_i

Q_re＝∑(q_i·δ_i·θ_i)

wherein Q is_i、q_i、δ_iAnd theta_iRespectively the actual total oil consumption, the cycle fuel injection quantity, the working condition correction factor and the temperature correction factor of the diesel engine in the ith cycle in the latest active regeneration interval, Q_crTo set the threshold value of total fuel consumption, q_clThe method comprises the following steps that the operation working condition of the diesel engine is the same as the current operation working condition and the circulating fuel injection quantity is in a clean state;

the trigger unit judges whether any one of the following conditions is met in real time:

the increase rate of the circulating fuel injection quantity is larger than a first threshold value;

the actual total oil consumption increase rate is greater than a second threshold;

correcting the total oil consumption to be larger than a third threshold value;

if yes, starting the active regeneration process of the DPF, otherwise, not starting the active regeneration process of the DPF;

the DPF active regeneration is controlled from the perspective of oil consumption, the total oil consumption is calculated and corrected according to the difference of particulate matters generated by each unit of fuel under different working conditions and the exhaust temperature difference, the control precision during DPF active regeneration is improved, the influence of unsteady working condition fluctuation on a measurement result is avoided, a judgment mode combining the cyclic fuel injection quantity growth rate and the total oil consumption growth rate is provided, the stability of a DPF active regeneration system is improved, the influence of accidental factors on a DPF regeneration triggering process is reduced, the probability of DPF too-early regeneration or too-late regeneration is effectively reduced, the DPF regeneration effect is improved, and the economy and the dynamic property of a diesel engine are improved.

The determination process of the working condition correction factor and the temperature correction factor comprises the following steps:

the working condition correction module determines the working condition state of the vehicle, and the working condition state of the vehicle is divided into a starting working condition state, an idling working condition state and an operating working condition state;

when the working condition state of the vehicle is the starting working condition state, the working condition correction factor is beta₁Temperature correction factor of theta₁；

When the working condition state of the vehicle is the idling working condition state, the working condition correction factor is beta₂Temperature correction factor of theta₂；

And when the vehicle working condition state is the running working condition state, determining the working condition correction factor and the temperature correction factor through the strength judging step.

The determination process of the vehicle working condition state comprises the following steps:

the working condition correction module acquires the rotating speed, the gear and the clutch state of the diesel engine;

when the rotating speed of the diesel engine is lower than 500r/min, the working condition correction module judges that the working condition state of the vehicle is a starting working condition state;

when the gear of the diesel engine is in a neutral gear, a clutch pedal is not stepped on, and the rotating speed of the diesel engine is 500-800 r/min, the working condition correction module judges that the working condition state of the vehicle is an idling working condition state;

when the vehicle working condition state does not accord with the judgment conditions of the starting working condition state and the idling working condition state, the working condition correction module judges that the vehicle working condition state is the running working condition state.

The strength judging step comprises the following steps:

the working condition correction module acquires the rotating speed and the load of the diesel engine;

dividing a rotating speed interval corresponding to a small rotating speed, a medium rotating speed and a large rotating speed and a load interval corresponding to a small load, a medium load and a large load from small to large;

when the diesel engine is in a low rotating speed and a low load, the working condition correction factor is beta₃Temperature correction factor of theta₃；

When the diesel engine is in a low rotating speed and a medium load, the working condition correction factor is beta₄Temperature correction factor of theta₄；

When the diesel engine is in a low rotating speed and a high load, the working condition correction factor is beta₅Temperature correction factor of theta₅；

When the diesel engine is at medium speed and small load, the correction factor of the working condition is beta₆Temperature correction factor of theta₆；

When the diesel engine is at middle speed and load, the correction factor of working condition is beta₇Temperature correction factor of theta₇；

When the diesel engine is at medium rotating speed and large load, the working condition correction factor is beta₈Temperature correction factor of theta₈；

When the diesel engine is in large rotating speed and small load, the working condition correction factor is beta₉Temperature correction factor of theta₉；

When the diesel engine is in large rotating speed and medium load, the working condition correction factor is beta₁₀Temperature correction factor of theta₁₀；

When the diesel engine is in large rotating speed and large load, the working condition correction factor is beta₁₁Temperature correction factor of theta₁₁。

The device also comprises a correction calibration module which calibrates beta through the following calibration formula₁～β₁₁And theta₁～θ₁₁：

Wherein i is 1,2 … 11, e_pIs beta_iCorresponding to the discharge of particulate matter in the operating mode, e_pstThe discharge amount of particulate matters under rated working conditions;is theta_iCorresponding to the original discharge amount of particulate matter under working conditions, e_s1And e_s2And respectively calibrating the accumulated carbon quantity of the DPF before the circulation starts and after the circulation finishes in the process.

The vehicle DPF active regeneration triggering control system is realized based on a vehicle DPF active regeneration triggering control device, the vehicle DPF active regeneration triggering control device comprises a GPF front temperature sensor, a torque sensor, a crankshaft position sensor and a position sensor, the GPF front temperature sensor is used for determining the temperature of a GPF front inlet, the torque sensor is used for determining the load of a diesel engine, the crankshaft position sensor is used for determining the rotating speed of the diesel engine, and the position sensor is used for detecting the opening degrees of an accelerator pedal, a clutch pedal and a brake pedal.

Embodiments 1 and 2 provide a method and a system for triggering and controlling DPF active regeneration of a vehicle, which improve accuracy of an active regeneration timing of the DPF, improve a regeneration effect of the DPF, and improve economy and dynamics of a diesel engine.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.