CN113320516B - Diesel hybrid vehicle exhaust temperature control method and apparatus - Google Patents
Diesel hybrid vehicle exhaust temperature control method and apparatus Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
- B60W20/16—Control strategies specially adapted for achieving a particular effect for reducing engine exhaust emissions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/105—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0657—Engine torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/244—Charge state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
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- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0694—Engine exhaust temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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Abstract
The invention provides an exhaust temperature control method and equipment for a diesel hybrid vehicle. The method comprises the following steps: if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold value, if the engine water temperature is larger than a preset temperature threshold value, and if the vehicle speed is smaller than a preset speed threshold value and larger than zero, the exhaust temperature of the vehicle in the running process is increased; outputting the corrected engine torque command and the corrected motor driving torque or generating torque, and sending the corrected engine torque command to an engine controller; the engine controller increases the engine torque to the value of the corrected engine torque command, and increases the engine exhaust temperature during vehicle travel. The invention can effectively reduce the working condition that the exhaust temperature of the diesel engine for the heavy-duty hybrid vehicle is too low, improve the nitrogen oxide conversion efficiency of the SCR post-treatment device, meet the requirement of the nitrogen oxide limit value, and ensure the fuel economy while meeting the requirement of PEMS test.
Description
Technical Field
The embodiment of the invention relates to the technical field of hybrid vehicle control, in particular to a method and equipment for controlling exhaust temperature of a diesel hybrid vehicle.
Background
Nitrogen oxides, one of the main emission pollutants of diesel engines, are the main monitoring objects of diesel vehicle PEMS (portable emission testing system) tests. The main means for reducing the emission of nitrogen oxides is to purify the nitrogen oxides in the exhaust gas outside the engine body, for example by using an SCR (selective catalytic reduction) after-treatment device. However, the reduction of nox emissions by SCR is greatly affected by exhaust gas temperature, and when the temperature of the SCR carrier is low to a certain extent, the conversion efficiency of SCR to nox is drastically reduced. In the urban working condition of PEMS test, the low speed of a vehicle leads to low exhaust temperature of an engine, and at present, the engine is deteriorated in combustion by mainly adjusting the calibration of the engine, the emission of nitrogen oxides of the bare engine of the engine is reduced, and the exhaust temperature is increased. Therefore, it is an urgent technical problem to be solved in the art to develop a method and apparatus for controlling exhaust temperature of a diesel hybrid vehicle, which can effectively overcome the above-mentioned drawbacks of the related art.
Disclosure of Invention
In order to solve the above problems in the prior art, embodiments of the present invention provide a method and an apparatus for controlling an exhaust temperature of a diesel hybrid vehicle.
In a first aspect, an embodiment of the invention provides a diesel hybrid vehicle exhaust temperature control method, including: if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold value, if the engine water temperature is larger than a preset temperature threshold value, and if the vehicle speed is smaller than a preset speed threshold value and larger than zero, the exhaust temperature in the vehicle running process is increased; outputting the corrected engine torque command and the corrected motor driving torque or generating torque, and sending the corrected engine torque command to an engine controller; the engine controller increases the engine torque to the value of the corrected engine torque command, and increases the engine exhaust temperature during vehicle travel.
On the basis of the content of the above method embodiment, the method for controlling the exhaust temperature of the diesel hybrid vehicle provided in the embodiment of the present invention further includes, after the increasing the engine exhaust temperature during the running of the vehicle, the steps of: and if the vehicle speed is equal to zero, outputting the corrected engine start/stop instruction, and sending the corrected engine start/stop instruction to an engine controller to increase the exhaust temperature during the start/stop of the engine.
On the basis of the above method embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle according to an embodiment of the present invention is a method for increasing exhaust temperature during vehicle driving and outputting a corrected engine torque command and a corrected motor driving torque or a corrected power generation torque, including: if the exhaust temperature at the inlet of the selective catalytic reduction SCR is smaller than the set upper limit value of the temperature, acquiring a nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR, if the nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR is larger than a ratio emission set value, acquiring an engine correction torque, and acquiring a vehicle driving torque, if the vehicle driving torque is smaller than or equal to the engine correction torque, simultaneously driving the vehicle and the motor by the engine, and if the vehicle driving torque is larger than the engine correction torque, driving the vehicle by the engine and the motor together.
On the basis of the content of the above method embodiment, the method for controlling the exhaust temperature of the diesel hybrid vehicle, provided by the embodiment of the invention, for acquiring the engine correction torque includes: the method comprises the steps of taking the rotating speed of a diesel engine as input, calibrating a correction torque meter through an engine bench test, enabling the actually measured exhaust temperature at the inlet of the selective catalytic reduction SCR to be equal to a set upper limit value of the temperature, establishing corresponding relations between different diesel engine rotating speeds and engine correction torques, and determining the engine correction torques corresponding to the current rotating speeds according to the corresponding relations.
On the basis of the content of the above method embodiment, the method for controlling the exhaust temperature of the diesel hybrid vehicle, provided by the embodiment of the invention, for sending the corrected engine start/stop command to the engine controller to increase the exhaust temperature at the time of starting/stopping the engine, comprises the following steps: if the engine is in an operating state, if the idling start-stop enabling is activated, the engine is shut down when the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than a set upper limit value of temperature, and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is less than or equal to the set upper limit value of temperature, the original operating state of the engine is maintained.
On the basis of the content of the above method embodiment, the method for controlling the exhaust temperature of the diesel hybrid vehicle according to the embodiment of the present invention, which sends the corrected engine start/stop command to the engine controller to increase the exhaust temperature at the time of starting/stopping the engine, further includes: if the engine is in a flameout state, starting the engine if the exhaust temperature at the inlet of the selective catalytic reduction SCR is lower than a temperature set lower limit value; and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than or equal to the temperature set lower limit value, activating the idling start-stop enable, starting the engine, and if the idling start-stop enable is not activated, stopping the engine.
On the basis of the content of the foregoing method embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle according to an embodiment of the present invention further includes, after the engine is in the running state and before the idle start-stop enable is activated: if the idle start-stop enable is not activated, the engine keeps the running state unchanged.
In a second aspect, an embodiment of the present invention provides a diesel hybrid vehicle exhaust temperature control apparatus including: the first main module is used for increasing the exhaust temperature in the running process of the vehicle if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold value, if the water temperature of the engine is larger than a preset temperature threshold value, and if the vehicle speed is smaller than a preset speed threshold value and larger than zero; the second main module is used for outputting the corrected engine torque instruction and the corrected motor driving torque or power generation torque and sending the corrected engine torque instruction to the engine controller; and the third main module is used for increasing the engine torque by the engine controller to reach the value of the corrected engine torque instruction and increasing the exhaust temperature of the engine in the running process of the vehicle.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method for controlling the exhaust temperature of the diesel hybrid vehicle provided by any one of the various implementation manners of the first aspect.
In a fourth aspect, embodiments of the invention provide a non-transitory computer readable storage medium storing computer instructions that cause a computer to perform a diesel hybrid vehicle exhaust temperature control method provided in any of various implementations of the first aspect.
According to the method and the device for controlling the exhaust temperature of the diesel hybrid vehicle, provided by the embodiment of the invention, the exhaust temperature in the running process of the vehicle is increased, the corrected engine torque instruction and the corrected motor driving torque or power generation torque are output, the corrected engine torque instruction is sent to the engine controller, the engine controller increases the engine torque to reach the numerical value of the corrected engine torque instruction, the exhaust temperature of the engine in the running process of the vehicle is increased, the over-low working condition of the exhaust temperature of a diesel engine for a heavy hybrid vehicle can be effectively reduced, the nitrogen oxide conversion efficiency of an SCR post-processing device is improved, the nitrogen oxide limit value requirement is met, and the fuel economy is ensured while the PEMS test requirement is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below to the drawings required for the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling exhaust temperature of a diesel hybrid vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an exhaust temperature control device of a diesel hybrid vehicle according to an embodiment of the present invention;
fig. 3 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. In addition, technical features of various embodiments or individual embodiments provided by the present invention may be arbitrarily combined with each other to form a feasible technical solution, and such combination is not limited by the sequence of steps and/or the structural composition mode, but must be realized by a person skilled in the art, and when the technical solution combination is contradictory or cannot be realized, such a technical solution combination should not be considered to exist and is not within the protection scope of the present invention.
During the complete vehicle PEMS test, if the exhaust temperature at the SCR inlet is too low and the emission of nitrogen oxides in tail gas exceeds the standard through monitoring and judgment, the corrected engine torque is calculated or the engine is controlled to start/stop, then the engine control system executes the operation to increase the exhaust temperature at the SCR inlet, and the SCR post-treatment device has high-efficiency nitrogen oxide conversion rate and reduces the emission of nitrogen oxides. The corrected engine torque is used for generating power and storing the power in a battery except for driving the vehicle, and the rotating speed of the engine is not corrected in the whole control process. Based on this idea, an embodiment of the present invention provides a method for controlling exhaust temperature of a diesel hybrid vehicle, referring to fig. 1, the method including: if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold value, if the engine water temperature is larger than a preset temperature threshold value, and if the vehicle speed is smaller than a preset speed threshold value and larger than zero, the exhaust temperature of the vehicle in the running process is increased; outputting the corrected engine torque command and the corrected motor driving torque or generating torque, and sending the corrected engine torque command to an engine controller; the engine controller increases the engine torque to the value of the corrected engine torque command, and increases the engine exhaust temperature during vehicle travel.
Specifically, firstly, the vehicle control system performs self-checking, all parts can work normally, and the vehicle is in a key on state. Judging SOC < SOC uplimit Judging the current battery stateWhether or not charging is possible in this state. SOC is the battery charge at the current state, SOC uplimit Is a set value, and is set according to the actual condition of the battery, such as 60% to 80%, and specifically may be 70%.
If SOC < SOC uplimit If yes, entering the next step to judge whether the water temperature of the engine is greater than 70 ℃; if the state is not established, the vehicle is considered to be in a pure electric driving state, the engine is in a flameout state, exhaust temperature control is not needed, and the exhaust temperature control module is withdrawn. The SOC parameter value is originated from a battery control system, is received by the hybrid controller through a CAN bus and serves as an input parameter. Judging whether the water temperature of the engine is more than 70 ℃, and when the PEMS road test is carried out, starting from the time when the water temperature of the engine reaches more than 70 ℃ for the first time to the time when the test is finished, the recorded test data is called test effective data, so that the condition that the water temperature of the engine meets the requirements of the PEMS test is one of the preconditions for carrying out temperature exhaust control. If the water temperature value of the engine is more than 70 ℃, the vehicle speed V is judged to be less than 55km/h, and if the water temperature value is not more than 70 ℃, the exhaust temperature control module is quitted. The engine water temperature value is sourced from an engine controller, is received by the hybrid controller through a CAN bus and is used as an input parameter. The vehicle speed V is judged to be less than 55km/h, and when the PEMS road test is carried out, the vehicle speed V is required to be less than 55km/h under the urban working condition according to the urban, suburban and high-speed running sequence, so that the problem that the urban working condition has too low exhaust temperature during the PEMS test is solved. If the vehicle speed V is less than 55km/h, judging whether the vehicle speed V is 0, and if not, exiting the exhaust temperature control module. The vehicle speed parameter value may originate from the vehicle ABS system or from the transmission system (different vehicles, the vehicle speed parameter may originate from different subsystems), via the CAN bus, and is received by the hybrid controller as an input parameter. It is determined whether the vehicle speed V is 0. If the vehicle speed V is not equal to 0, the vehicle is in a running state, and then a running state temperature exhaust control submodule is started; and if the vehicle speed V =0 indicates that the vehicle is in a parking state, entering a start/stop state exhaust temperature control submodule.
Based on the content of the foregoing method embodiment, as an alternative embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle provided in the embodiment of the present invention further includes, after the increasing the engine exhaust temperature during the vehicle driving process: and if the vehicle speed is equal to zero, outputting the corrected engine start/stop instruction, and sending the corrected engine start/stop instruction to an engine controller to increase the exhaust temperature during the start/stop of the engine.
Specifically, when the vehicle speed V =0 is in the stopped state, the start/stop state exhaust temperature control submodule is entered in order to reduce the occurrence of an excessively low exhaust temperature due to frequent start/stop, and the output is a corrected engine start/stop instruction. Outputting the corrected engine start/stop command to an ECM (engine controller) and then controlling engine execution by the ECM can reduce the engine exhaust temperature that is too low due to frequent start/stops.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle provided in the embodiment of the present invention, that increases exhaust temperature during vehicle driving, and outputs a corrected engine torque command and a corrected motor driving torque or generating torque, includes: if the exhaust temperature at the inlet of the selective catalytic reduction SCR is smaller than the set upper limit value of the temperature, acquiring a nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR, if the nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR is larger than a ratio emission set value, acquiring an engine correction torque, and acquiring a vehicle driving torque, if the vehicle driving torque is smaller than or equal to the engine correction torque, simultaneously driving the vehicle and the motor by the engine, and if the vehicle driving torque is larger than the engine correction torque, driving the vehicle by the engine and the motor together.
Specifically, it is determined whether the SCR inlet exhaust temperature is below a set value. For the SCR post-treatment device of the heavy national VI diesel engine, a temperature sensor is arranged at the inlet position and used for monitoring the exhaust temperature of the SCR inlet, and the temperature value is adopted as the input parameter t of the step scr The value of (i.e., selective catalytic reduction SCR inlet exhaust temperature). Parameter t uplimit An upper limit value, for example 220 ℃, may be set for the temperature in practical applications according to the catalyst temperature at which the SCR starts to sharply decrease the nox conversion efficiency.If t is scr ＜t uplimit If yes, obtaining the specific emission value BSNO of nitrogen oxide at the outlet of the SCR x (ii) a If the exhaust temperature does not meet the condition that SCR keeps high nitrogen oxide conversion efficiency, the original running state of the engine is maintained, namely the engine torque instruction is not corrected. Obtaining specific emission value BSNO of nitrogen oxide at SCR outlet x . For the SCR post-treatment device of the heavy national VI diesel engine, a nitrogen oxide sensor is arranged at an outlet position and used for monitoring the concentration (unit is ppm) of nitrogen oxide at the outlet of an SCR, and then the specific emission (unit is g/kW.h) of the nitrogen oxide is calculated in an engine controller according to parameters such as the engine power, the exhaust flow and the concentration of the nitrogen oxide at the time and is used as an input parameter BSNO x The value of (c). Determination of BSNO x ＞BSNO xlimit Parameter BSNO xlimit For setting values, for example, a PEMS limit of 690mg/kW.h can be set, and in practical applications, a proper margin can be set on the basis of the regulation limit or according to the actual PEMS test result. If BSNO x ＞BSNO xlimit If true, the engine correction torque T is obtained 0 (ii) a If the engine torque command value is not corrected, the original running state of the engine is maintained if the emission of the nitrogen oxides is low. Obtaining the corrected torque T of the engine 0 Correction of the engine Torque T 0 In the process of obtaining the preset value, the rotating speed of the diesel engine is used as input, and the correction torque meter can be calibrated through an engine bench test, so that the measured t is measured scr And t uplimit Approximately equal, establishing the relationship between different diesel engine rotating speeds and engine correction torque, and further determining the engine correction torque T corresponding to the current rotating speed 0 . The engine speed is derived from an Engine Controller (ECM) and an engine speed sensor is mounted on the engine to monitor engine speed as an input. Obtaining a required torque T for driving a vehicle vehicle The torque required to drive the vehicle is a calculated variable in the hybrid control module, which is used as an input. Judgment of T vehicle ≤T 0 If T is vehicle ≤T 0 If so, entering a pure oil driving and power generation mode; if T is vehicle ≤T 0 If not, entering a hybrid driving mode. Entering a pure oil drive and power generation mode if the engine torque is equal to T 0 Equal to or more than the required torque T for driving the vehicle vehicle This means that the engine drives the motor to generate electricity in addition to driving the vehicle, and therefore the vehicle enters a pure oil driving and electricity generating mode. The engine correction torque command value is taken as T 0 The rotating speed of the engine is kept unchanged, and the power generation torque instruction of the motor is T 0 -T vehicle The motor speed remains unchanged. Enter hybrid drive mode if engine torque equals T 0 Less than the required torque T for driving the vehicle vehicle This illustrates the need for the engine and electric machine to drive the vehicle together, so the vehicle enters a hybrid mode. Engine corrected torque command value T 0 The engine speed is kept unchanged, and the motor driving torque instruction is T vehicle -T 0 The motor speed remains unchanged.
Based on the content of the foregoing method embodiment, as an alternative embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle, provided in the embodiment of the present invention, the obtaining engine correction torque includes: the method comprises the steps of taking the rotating speed of a diesel engine as input, calibrating a correction torque meter through an engine bench test, enabling the actually measured exhaust temperature at the inlet of the selective catalytic reduction SCR to be equal to a set upper limit value of the temperature, establishing corresponding relations between different diesel engine rotating speeds and engine correction torques, and determining the engine correction torques corresponding to the current rotating speeds according to the corresponding relations.
Based on the content of the foregoing method embodiment, as an alternative embodiment, the method for controlling the exhaust temperature of a diesel hybrid vehicle, according to the embodiment of the present invention, sending a corrected engine start/stop command to an engine controller to increase the exhaust temperature at the time of engine start/stop, includes: if the engine is in an operating state, if the idling start-stop enabling is activated, the engine is shut down when the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than a set upper limit value of temperature, and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is less than or equal to the set upper limit value of temperature, the original operating state of the engine is maintained.
Based on the content of the foregoing method embodiment, as an optional embodiment, the method for controlling an exhaust temperature of a diesel hybrid vehicle according to an embodiment of the present invention, where the corrected engine start/stop instruction is sent to an engine controller to increase an exhaust temperature at the time of engine start/stop, further includes: if the engine is in a flameout state, starting the engine if the exhaust temperature at the inlet of the selective catalytic reduction SCR is lower than a temperature set lower limit value; and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than or equal to the temperature set lower limit value, activating the idling start-stop enable, starting the engine, and if the idling start-stop enable is not activated, stopping the engine.
Based on the content of the foregoing method embodiment, as an alternative embodiment, the method for controlling exhaust temperature of a diesel hybrid vehicle provided in this embodiment of the present invention further includes, after the engine is in the running state and before the idle start-stop enabling is activated: if the idle start-stop enable is not activated, the engine keeps the running state unchanged.
Specifically, it is determined whether the engine is in an operating state or a shut-off state. If the engine is in the running state, judging that the idling start-stop is enabled; and if the engine is in a flameout state, judging whether the exhaust temperature at the SCR inlet is lower than a set value. And judging whether the idling start-stop is enabled, if the idling start-stop is enabled, judging whether the exhaust temperature of the selective catalytic reduction SCR inlet is higher than a temperature set upper limit value, and if the idling start-stop is not enabled, keeping the engine in a running state. Judging whether the exhaust temperature at the inlet of the selective catalytic reduction SCR is higher than a set upper limit value of the temperature, if so, determining whether the exhaust temperature at the inlet of the selective catalytic reduction SCR is higher than the set upper limit value of the temperature, and if so, determining whether the exhaust temperature at the inlet of the selective catalytic reduction SCR is higher than the set upper limit value of the temperature scr ＞t uplimit If yes, the engine is shut down; if t is scr ＞t uplimit If the temperature is not over low, the original running state of the engine is maintained, and the engine does not shut down. Judging whether the exhaust temperature at the inlet of the selective catalytic reduction SCR is lower than a temperature set lower limit value or not, if t scr ＜t lowlimit If yes, the engine is started when the exhaust temperature is too low; if t is scr ＜t lowlimit If not, judging that the idling start-stop is enabled. Wherein, t lowlimit Setting a lower limit for the temperature, e.g. 210 deg.C, t lowlimit Value ratio t uplimit Is small. And judging the idle speed start-stop enabling, starting the engine if the idle speed start-stop enabling is activated, and stopping the engine if the idle speed start-stop enabling is not activated.
According to the exhaust temperature control method of the diesel hybrid vehicle, provided by the embodiment of the invention, the exhaust temperature in the running process of the vehicle is increased, the corrected engine torque instruction and the corrected motor driving torque or power generation torque are output, the corrected engine torque instruction is sent to the engine controller, the engine controller increases the engine torque to reach the numerical value of the corrected engine torque instruction, the exhaust temperature of the engine in the running process of the vehicle is increased, the working condition that the exhaust temperature of a diesel engine for a heavy hybrid vehicle is too low can be effectively reduced, the nitrogen oxide conversion efficiency of an SCR post-processing device is improved, the nitrogen oxide limit value requirement is met, and the fuel economy is ensured while the PEMS test requirement is met.
The basis for implementing the various embodiments of the present invention is a programmed process performed by a device having a processor function. Therefore, in engineering practice, the technical solutions and functions thereof of the embodiments of the present invention can be packaged into various modules. Based on this reality, on the basis of the above embodiments, embodiments of the present invention provide a diesel hybrid vehicle exhaust temperature control apparatus for performing the diesel hybrid vehicle exhaust temperature control method in the above method embodiments. Referring to fig. 2, the apparatus includes: the first main module is used for increasing the exhaust temperature in the running process of the vehicle if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold value, if the water temperature of the engine is larger than a preset temperature threshold value, and if the vehicle speed is smaller than a preset speed threshold value and larger than zero; the second main module is used for outputting the corrected engine torque instruction and the corrected motor driving torque or power generation torque and sending the corrected engine torque instruction to the engine controller; and the third main module is used for increasing the engine torque by the engine controller to reach the value of the corrected engine torque instruction and increasing the exhaust temperature of the engine in the running process of the vehicle.
The exhaust temperature control device for the diesel hybrid vehicle provided by the embodiment of the invention adopts a plurality of modules in a figure 2, outputs a corrected engine torque instruction and a corrected motor driving torque or generating torque by increasing the exhaust temperature in the vehicle running process, sends the corrected engine torque instruction to the engine controller, and the engine controller increases the engine torque to reach the numerical value of the corrected engine torque instruction, so that the exhaust temperature of the engine in the vehicle running process is increased, the working condition that the exhaust temperature of a diesel engine for a heavy hybrid vehicle is too low can be effectively reduced, the nitrogen oxide conversion efficiency of an SCR post-processing device is increased, the nitrogen oxide limit value requirement is met, and the fuel economy is ensured while the PEMS test requirement is met.
It should be noted that, the apparatus in the apparatus embodiment provided by the present invention may be used for implementing methods in other method embodiments provided by the present invention, except that corresponding function modules are provided, and the principle of the apparatus embodiment provided by the present invention is basically the same as that of the apparatus embodiment provided by the present invention, so long as a person skilled in the art obtains corresponding technical means by combining technical features on the basis of the apparatus embodiment described above, and obtains a technical solution formed by these technical means, on the premise of ensuring that the technical solution has practicability, the apparatus in the apparatus embodiment described above may be modified, so as to obtain a corresponding apparatus class embodiment, which is used for implementing methods in other method class embodiments. For example:
based on the content of the above device embodiment, as an alternative embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: the first submodule is used for realizing that after the exhaust temperature of the engine in the running process of the vehicle is increased, the method further comprises the following steps: and if the vehicle speed is equal to zero, outputting the corrected engine start/stop instruction, and sending the corrected engine start/stop instruction to an engine controller to increase the exhaust temperature during the start/stop of the engine.
Based on the content of the above device embodiment, as an alternative embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: the second submodule is used for realizing the purpose of increasing the exhaust temperature in the running process of the vehicle and outputting the corrected engine torque instruction and the corrected motor driving torque or the corrected power generation torque, and comprises: if the exhaust temperature at the inlet of the selective catalytic reduction SCR is smaller than the set upper limit value of the temperature, acquiring a nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR, if the nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR is larger than a ratio emission set value, acquiring an engine correction torque, and acquiring a vehicle driving torque, if the vehicle driving torque is smaller than or equal to the engine correction torque, simultaneously driving the vehicle and the motor by the engine, and if the vehicle driving torque is larger than the engine correction torque, driving the vehicle by the engine and the motor together.
Based on the content of the foregoing device embodiment, as an optional embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: a third submodule, configured to implement said obtaining an engine correction torque, comprising: the method comprises the steps of taking the rotating speed of a diesel engine as input, calibrating a correction torque meter through an engine bench test, enabling the actually measured exhaust temperature at the inlet of the selective catalytic reduction SCR to be equal to a set upper limit value of the temperature, establishing corresponding relations between different diesel engine rotating speeds and engine correction torques, and determining the engine correction torques corresponding to the current rotating speeds according to the corresponding relations.
Based on the content of the above device embodiment, as an alternative embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: the fourth submodule is used for realizing the above and sending the corrected engine start/stop instruction to the engine controller, and improving the exhaust temperature when the engine starts/stops, and comprises: if the engine is in an operating state, if the idling start-stop enabling is activated, the engine is shut down when the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than a set upper limit value of temperature, and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is less than the set upper limit value of temperature, the original operating state of the engine is maintained.
Based on the content of the above device embodiment, as an alternative embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: the fifth submodule is used for realizing the above and sending the corrected engine start/stop instruction to the engine controller, and improving the exhaust temperature when the engine starts/stops, and further comprises: if the engine is in a flameout state, starting the engine if the exhaust temperature at the inlet of the selective catalytic reduction SCR is less than a temperature setting lower limit value; and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than or equal to the temperature set lower limit value, activating the idling start-stop enable, starting the engine, and if the idling start-stop enable is not activated, stopping the engine.
Based on the content of the above device embodiment, as an alternative embodiment, the exhaust temperature control device for a diesel hybrid vehicle provided in the embodiment of the present invention further includes: a sixth submodule, for enabling after the engine is in the running state and before the idle start-stop enable is activated, further comprising: if the idle start-stop enable is not activated, the engine keeps the running state unchanged.
The method of the embodiment of the invention is realized by depending on the electronic equipment, so that the related electronic equipment is necessarily introduced. To this end, an embodiment of the present invention provides an electronic apparatus, as shown in fig. 3, including: the system comprises at least one processor (processor), a communication Interface (communication Interface), at least one memory (memory) and a communication bus, wherein the at least one processor, the communication Interface and the at least one memory are communicated with each other through the communication bus. The at least one processor may invoke logic instructions in the at least one memory to perform all or a portion of the steps of the methods provided by the various method embodiments described previously.
In addition, the logic instructions in the at least one memory may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present invention or a part thereof which substantially contributes to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the method embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. Based on this recognition, each block in the flowchart or block diagrams may represent a module, a program segment, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In this patent, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A diesel hybrid vehicle exhaust temperature control method, characterized by comprising: if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold, the engine water temperature is larger than a preset temperature threshold, and the vehicle speed is smaller than a preset speed threshold and larger than zero, the exhaust temperature in the vehicle running process is increased; outputting the corrected engine torque command and the corrected motor driving torque or generating torque, and sending the corrected engine torque command to an engine controller; the engine controller increases the engine torque to reach the value of the corrected engine torque instruction, and increases the exhaust temperature of the engine in the running process of the vehicle;
the increasing of the exhaust temperature during the running of the vehicle and the outputting of the corrected engine torque command and the corrected motor driving torque or the corrected power generation torque includes: if the exhaust temperature at the inlet of the selective catalytic reduction SCR is smaller than the set upper limit value of the temperature, acquiring a nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR, if the nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR is larger than a ratio emission set value, acquiring an engine correction torque, and acquiring a vehicle driving torque, if the vehicle driving torque is smaller than or equal to the engine correction torque, simultaneously driving the vehicle and the motor by the engine, and if the vehicle driving torque is larger than the engine correction torque, driving the vehicle by the engine and the motor together.
2. The diesel hybrid vehicle exhaust temperature control method according to claim 1, characterized by further comprising, after the increasing the engine exhaust temperature during vehicle running: and if the vehicle speed is equal to zero, outputting a corrected engine start/stop instruction, and sending the corrected engine start/stop instruction to an engine controller to increase the exhaust temperature during the start/stop of the engine.
3. The diesel hybrid vehicle exhaust temperature control method of claim 1, wherein said obtaining an engine correction torque comprises: the method comprises the steps of taking the rotating speed of a diesel engine as input, calibrating a correction torque meter through an engine bench test, enabling the actually measured exhaust temperature at the inlet of the selective catalytic reduction SCR to be equal to a set upper limit value of the temperature, establishing corresponding relations between different diesel engine rotating speeds and engine correction torques, and determining the engine correction torques corresponding to the current rotating speeds according to the corresponding relations.
4. The diesel hybrid vehicle exhaust temperature control method according to claim 2, wherein the sending the corrected engine start/stop command to the engine controller to increase the exhaust temperature at the time of engine start/stop comprises: if the engine is in an operating state and the idling start-stop enabling is activated, the engine is shut down when the exhaust temperature at the inlet of the selective catalytic reduction SCR is higher than a set upper limit value of temperature, and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is lower than or equal to the set upper limit value of temperature, the original operating state of the engine is maintained.
5. The diesel hybrid vehicle exhaust temperature control method according to claim 4, wherein the engine start/stop command after the correction is sent to an engine controller to increase the exhaust temperature at the time of engine start/stop, further comprising: if the engine is in a flameout state and the exhaust temperature at the inlet of the selective catalytic reduction SCR is lower than the lower temperature setting limit value, starting the engine; and if the exhaust temperature at the inlet of the selective catalytic reduction SCR is greater than or equal to the temperature set lower limit value, activating the idling start-stop enable, starting the engine, and if the idling start-stop enable is not activated, stopping the engine.
6. The diesel hybrid vehicle exhaust temperature control method of claim 4, further comprising, after the if engine is in an on state and before the if idle start-stop enable is activated: if the idle start-stop enable is not activated, the engine keeps the running state unchanged.
7. An exhaust temperature control apparatus for a diesel hybrid vehicle, comprising: the first main module is used for increasing the exhaust temperature in the running process of the vehicle if the real-time battery electric quantity is smaller than a preset battery electric quantity threshold, the engine water temperature is larger than a preset temperature threshold, and the vehicle speed is smaller than a preset speed threshold and larger than zero; the second main module is used for outputting the corrected engine torque instruction and the corrected motor driving torque or power generation torque and sending the corrected engine torque instruction to the engine controller; the third main module is used for increasing the engine torque by the engine controller to reach the value of the corrected engine torque instruction and increasing the exhaust temperature of the engine in the running process of the vehicle;
the increasing of the exhaust temperature during the running of the vehicle and the outputting of the corrected engine torque command and the corrected motor driving torque or the corrected power generation torque includes: if the exhaust temperature at the inlet of the selective catalytic reduction SCR is smaller than the set upper limit value of the temperature, acquiring a nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR, if the nitrogen oxide ratio emission value at the outlet of the selective catalytic reduction SCR is larger than a ratio emission set value, acquiring an engine correction torque, and acquiring a vehicle driving torque, if the vehicle driving torque is smaller than or equal to the engine correction torque, simultaneously driving the vehicle and the motor by the engine, and if the vehicle driving torque is larger than the engine correction torque, driving the vehicle by the engine and the motor together.
8. An electronic device, comprising:
at least one processor, at least one memory, and a communication interface; wherein,
the processor, the memory and the communication interface are communicated with each other;
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 6.
9. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 6.
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