CN114687876B - Vehicle idle speed response control method and vehicle - Google Patents
Vehicle idle speed response control method and vehicle Download PDFInfo
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- CN114687876B CN114687876B CN202210378764.9A CN202210378764A CN114687876B CN 114687876 B CN114687876 B CN 114687876B CN 202210378764 A CN202210378764 A CN 202210378764A CN 114687876 B CN114687876 B CN 114687876B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
- F02D41/083—Introducing corrections for particular operating conditions for idling taking into account engine load variation, e.g. air-conditionning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention belongs to the technical field of vehicles and discloses a vehicle idle speed response control method and a vehicle. The vehicle idle speed response control method comprises the following steps: acquiring a pilot pressure value, an idle speed duration and a main pump pressure; judging whether the pilot pressure value is greater than or equal to a set pressure value; judging whether the idle speed time length is greater than or equal to a first set time length or not; judging whether the pressure of the main pump is within a set pressure range; when the pilot pressure value is greater than or equal to a set pressure value, the idling time length is greater than or equal to a first set time length, and the pressure of a main pump is not in a set pressure range, switching combustion parameters of an engine system into transient combustion parameters; the transient combustion parameters at least comprise a first fuel injection quantity, a first fuel injection advance angle and a first rail pressure value. The vehicle idle speed response control method can enable the engine to output larger torque in a short time, thereby improving the power performance of the engine.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle idle speed response control method and a vehicle.
Background
Hydraulic systems are one of the important systems in excavators. The hydraulic system comprises a multi-way valve, a hydraulic system, a controller and a variable pump, wherein a handle lever of a vehicle is operated to enable a pilot pressure valve of the hydraulic system to output corresponding pilot pressure and guide hydraulic oil into a control cavity of the multi-way valve to enable the multi-way valve to be reversed, a pressure sensor is arranged on a pipeline between the pilot pressure valve and the multi-way valve and converts the pilot pressure into an electric signal to be input to the controller, and the controller controls the opening of a proportional valve of the variable pump according to the electric signal so as to adjust the displacement of the variable pump; and hydraulic oil of the main pump is guided into a corresponding actuating mechanism through the multi-way valve, so that the excavator performs corresponding actions.
In order to ensure the dynamic property of the whole excavator, strict requirements are provided for the falling speed interval and the responsiveness of an engine. However, when the excavator is loaded for the first time after idling for a long time, due to the long-time idling, the combustion efficiency of the engine is reduced, the temperature of engine oil is cooled, and the resistance is increased, so that the phenomenon of the rotation speed of the engine is caused. The main reason why the engine has the phenomenon of rotating speed drop is that the engine cannot instantaneously output maximum torque due to slow air inlet response.
Disclosure of Invention
The invention aims to provide a vehicle idling response control method and a vehicle, and aims to solve the problems that when an excavator is loaded for the first time after idling for a long time, the engine air inlet response is slow, and the maximum torque cannot be output instantly.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vehicle idling response control method comprises an engine system and a hydraulic system, wherein the hydraulic system comprises a pilot pressure valve, a multi-way valve and a main pump, the multi-way valve and the pilot pressure valve are connected through a pipeline, the main pump and the multi-way valve are connected through a pipeline, the pilot pressure valve can control hydraulic oil to apply pilot pressure on the multi-way valve so as to drive the multi-way valve to change direction, an output shaft of the engine system is in transmission connection with an input shaft of the main pump, the engine system can drive the multi-way main pump to work so that the hydraulic oil can be communicated to an execution mechanism through the multi-way valve, and the vehicle idling response control method comprises the following steps:
acquiring a pilot pressure value, an idle speed duration and a main pump pressure;
judging whether the pilot pressure value is greater than or equal to a set pressure value;
judging whether the idle speed time length is greater than or equal to a first set time length or not;
judging whether the pressure of the main pump is within a set pressure range or not;
when the pilot pressure value is greater than or equal to a set pressure value, the idling time length is greater than or equal to a first set time length, and the pressure of the main pump is within a set pressure range, switching combustion parameters of an engine system into transient combustion parameters;
the transient combustion parameters at least comprise a first fuel injection quantity, a first fuel injection advance angle and a first rail pressure value.
Preferably, the determining whether the pilot pressure value is equal to or greater than a set pressure value includes:
acquiring the state of an engine;
judging whether the state of the engine is an overhun state or not;
if the state of the engine is an overhun state, judging whether the pilot pressure value is larger than or equal to a set pressure value;
the Overrun state is a state that the required torque of the engine is zero and the fuel injection quantity of the engine is zero.
Preferably, before switching the combustion parameter of the engine system to the transient combustion parameter, the method further comprises:
when the pilot pressure value is greater than or equal to a set pressure value, the idling time length is greater than or equal to a first set time length, and the main pump pressure is within a set pressure range, beginning to record the duration of the pilot pressure value which is greater than or equal to the set pressure value;
judging whether the duration is less than a second set duration;
if the duration is less than a second set duration, the signal value of the pilot pressure value which is greater than or equal to the set pressure value is a true signal;
and switching the combustion parameter of the engine system to be the transient combustion parameter.
Preferably, if the duration is greater than or equal to the second set duration, the signal value of which the pilot pressure value is greater than or equal to the set pressure value is a false signal;
the combustion parameters of the engine system are kept as the original combustion parameters;
the original combustion parameters at least comprise a second fuel injection quantity, a second fuel injection advance angle and a second rail pressure value.
Preferably, the first fuel injection quantity is smaller than the second fuel injection quantity, the first fuel injection advance angle is smaller than the second fuel injection advance angle, and the first rail pressure value is smaller than the second rail pressure value.
Preferably, when the combustion parameter of the engine system is the transient combustion parameter, the injection mode of the engine is a first injection mode, and when the combustion parameter of the engine system is the original combustion parameter, the injection mode of the engine is a second injection mode, the first injection mode includes pre-injection, main injection and post-injection, and the second injection mode includes pre-injection and main injection.
Preferably, when the pilot pressure value is smaller than the set pressure value, the combustion parameter of the engine system maintains the original combustion parameter; when the idling time length is smaller than a first set time length, maintaining the original combustion parameters of the engine system; when the main pump pressure is not in the set pressure range, the combustion parameter of the engine system maintains the original combustion parameter.
A vehicle for implementing the vehicle idle speed response control method described above.
Preferably, the hydraulic system further includes:
the first pressure sensor is used for detecting pilot pressure applied to the multi-way valve by hydraulic oil output by the pilot pressure valve;
a second pressure sensor for detecting a main pump pressure of the main pump.
Preferably, the vehicle is an excavator.
The invention has the beneficial effects that:
the invention provides a vehicle idle speed response control method and a vehicle. The vehicle idle speed response control method comprises the following steps: acquiring a pilot pressure value, an idle speed duration and a main pump pressure; judging whether the pilot pressure value is greater than or equal to a set pressure value; judging whether the idling time length is greater than or equal to a first set time length or not; judging whether the pressure of the main pump is within a set pressure range; when the pilot pressure value is greater than or equal to a set pressure value, the idling time length is greater than or equal to a first set time length, and the pressure of a main pump is not in a set pressure range, switching combustion parameters of an engine system into transient combustion parameters; the transient combustion parameters at least comprise a first fuel injection quantity, a first fuel injection advance angle and a first rail pressure value. When the excavator is loaded for the first time after idling, the combustion parameter of the engine system is switched to be the transient combustion parameter, the air inlet response of the engine can be improved through the first fuel injection quantity, the first fuel injection advance angle and the first rail pressure value, the engine can output larger torque in a short time, and therefore the power performance of the engine is improved.
Drawings
FIG. 1 is a first flowchart of a vehicle idle speed response control method according to an embodiment of the present invention;
fig. 2 is a second flowchart of a vehicle idle speed response control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The invention provides a vehicle which comprises an engine system and a hydraulic system, wherein the hydraulic system comprises a pilot pressure valve, a multi-way valve and a main pump, the multi-way valve is connected with the pilot pressure valve through a pipeline, the main pump is connected with the multi-way valve through a pipeline, the pilot pressure valve can control hydraulic oil to apply pilot pressure on the multi-way valve so as to drive the multi-way valve to change direction, an output shaft of the engine system is in transmission connection with an input shaft of the main pump, and the engine system can drive the main pump to work so that the hydraulic oil can flow to an execution mechanism through the multi-way valve.
The vehicle further comprises a first pressure sensor and a second pressure sensor, the first pressure sensor is used for detecting pilot pressure applied to the multi-way valve by hydraulic oil output by the pilot pressure valve, and the second pressure sensor is used for detecting main pump pressure of a main pump.
In the present embodiment, the vehicle is an excavator.
The invention also provides a vehicle idle speed response control method, which mainly aims at the problems that the engine air inlet response is slow and the maximum torque cannot be output instantly when the excavator is loaded for the first time after idling for a long time.
The vehicle idle speed response control method, as shown in fig. 1, includes the steps of:
s100, obtaining a pilot pressure value, an idling time length and a main pump pressure.
And S200, judging whether the pilot pressure value is greater than or equal to the set pressure value.
If the pilot pressure value is equal to or greater than the set pressure value, S300 is performed.
And if the pilot pressure value is smaller than the set pressure value, the engine system operates according to the original combustion parameters.
The transient combustion parameters comprise a first fuel injection quantity, a first fuel injection advance angle and a first rail pressure value.
The original combustion parameters comprise a second fuel injection quantity, a second fuel injection advance angle and a second rail pressure value.
When the combustion parameter of the engine system is a transient combustion parameter, the injection mode of the engine is a first injection mode, when the combustion parameter of the engine system is an original combustion parameter, the injection mode of the engine is a second injection mode, the first injection mode comprises pre-injection, main injection and post-injection, and the second injection mode comprises pre-injection and main injection.
The first fuel injection quantity is smaller than the second fuel injection quantity, the first fuel injection advance angle is smaller than the second fuel injection advance angle, and the first rail pressure value is smaller than the second rail pressure value. By the arrangement, it can be understood that when the excavator is loaded for the first time after idling, the oil injection quantity of an engine system can be reduced, the oil injection advance angle of the engine system is reduced, the rail pressure value of the engine system is reduced, and the post injection is increased, so that the exhaust emission is increased in a short time, the rotating speed of a turbocharger is increased, the air inflow of the engine system is increased, the instantaneous bearing capacity of the engine is improved, and the preparation is made for the work of a main pump.
The oil quantity injected in the main injection process is the majority of oil quantity required by the injection system for injecting the current combustion cycle, and is the main source of the output power of the engine; the pilot injection is one-time injection with small oil quantity before the main injection, the pilot injection can be used for pretreating the pressure and the temperature of a combustion chamber before the main injection, and after fuel oil of the main injection enters an air cylinder, the fuel oil can be combusted after a short delay due to the ignition effect of the pilot injection, so that the combustion temperature is reduced, the main injection becomes soft, and the atomization uniformity of the fuel oil can be improved; after the main injection, a precise amount of fuel can be supplied to the combustion chamber of the cylinder.
And S300, judging whether the idle speed time length is greater than or equal to a first set time length.
If the idle time is longer than or equal to the first set time, S400 is performed.
And if the idling time length is less than the first set time length, operating according to the original combustion parameters.
S400, judging whether the main pump pressure is in a set pressure range.
If the main pump pressure is within the set pressure range, S500 is performed.
And if the pressure of the main pump is not in the set pressure range, operating according to the original combustion parameters.
And S500, switching the combustion parameters of the engine system into transient combustion parameters.
It can be understood that the combustion parameter of the engine system is switched to the transient combustion parameter only when the pilot pressure value is greater than or equal to the set pressure value, the idle time period is greater than or equal to the first set time period, and the main pump pressure is within the set pressure range.
It can be understood that when the pilot pressure value is smaller than the set pressure value, the combustion parameter of the engine system maintains the original combustion parameter; when the idle time length is less than the first set time length, the combustion parameters of the engine system maintain the original combustion parameters; when the main pump pressure is not in the set pressure range, the combustion parameter of the engine system maintains the original combustion parameter. Namely, when one or more of the pilot pressure value is smaller than the set pressure value, the idling time period is smaller than the first set time period and the main pump pressure is not in the set pressure range, the combustion parameters of the engine system maintain the original combustion parameters.
The set pressure value, the first set time and the set pressure range of the main pump are all empirical values obtained by a large number of previous tests, wherein the set pressure value, the first set time and the set pressure range of the main pump are different for engine systems of different specifications.
In this embodiment, S200, S300, and S400 are sequentially executed. In other embodiments, S200, S300, and S400 may be performed simultaneously, or may be performed sequentially in other orders.
When the excavator is loaded for the first time after idling for a long time, the phenomenon that the state of the engine is in an overhun state can exist, and the phenomenon can also cause the problems that the response of air intake is slow and the maximum torque cannot be output instantly when the excavator is loaded for the first time after idling for a long time.
The overlarun state is a state in which the required torque of the engine is zero and the fuel injection quantity of the engine is zero. Specifically, the engine may have a state in which the rotation speed of the clutch disc is greater than the rotation speed of the flywheel in the overhun state, at this time, the engine is in a drag-down state, the required torque of the engine is zero, and the fuel injection amount of the engine is zero.
As shown in fig. 2, the step of determining whether the pilot pressure value is equal to or greater than the set pressure value includes the steps of:
the state of the engine is acquired.
And judging whether the state of the engine is an overhun state or not.
If the engine state is the overlarun state, S200 is performed.
Wherein, still include before the combustion parameter of switching engine system is transient combustion parameter:
when the pilot pressure value is larger than or equal to the set pressure value, the idling time period is larger than or equal to a first set time period, and the pressure of the main pump is in the set pressure range, the duration time period that the pilot pressure value is larger than or equal to the set pressure value is recorded.
And judging whether the duration is less than a second set duration.
If the duration is less than the second set duration, the signal value of which the pilot pressure value is greater than or equal to the set pressure value is a true signal; and switching the combustion parameter of the engine system to be the transient combustion parameter. It can be understood that the duration being less than the second set duration indicates that the signal value with the pilot pressure value being greater than or equal to the set pressure value is a true signal, and under this condition, the excavator is loaded for the first time after long idling, and the combustion parameter of the engine system is switched to be a transient combustion parameter.
If the duration is greater than or equal to a second set duration, the signal value of which the pilot pressure value is greater than or equal to the set pressure value is a false signal; and maintaining the combustion parameters of the engine system as the original combustion parameters. It can be understood that the duration is greater than or equal to the second set duration, which indicates that the signal value of the pilot pressure value is greater than or equal to the set pressure value is a false signal, under the condition, the excavator does not perform the first loading after the long idling, and the combustion parameters of the engine system still operate according to the original combustion parameters.
It can be understood that, in the process, the combustion parameter of the engine system is switched to the transient combustion parameter only when the pilot pressure value is greater than or equal to the set pressure value, the idle time length is greater than or equal to the first set time length, the main pump pressure is within the set pressure range, and the duration time length is less than the second set time length.
It can be understood that when the pilot pressure value is smaller than the set pressure value, the combustion parameter of the engine system maintains the original combustion parameter; when the idle time length is less than the first set time length, the combustion parameters of the engine system maintain the original combustion parameters; when the main pump pressure is not in the set pressure range, the combustion parameter of the engine system maintains the original combustion parameter. Namely, when one or more of the pilot pressure value is smaller than the set pressure value, the idling time period is smaller than the first set time period and the main pump pressure is not in the set pressure range, the combustion parameters of the engine system maintain the original combustion parameters.
Therefore, when the engine state is an overhun state, the vehicle idle speed response control method can distinguish whether the excavator needs to be loaded for the first time after idling, and when the excavator needs to be loaded for the first time after idling, the vehicle idle speed response control method can control the engine system to use the transient combustion parameters, so that the engine can output larger torque in a short time, and the power performance of the engine is improved.
The specific structures of the hydraulic system and the engine system belong to the prior art, and are not described herein again.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A vehicle idle speed response control method, wherein the vehicle includes an engine system and a hydraulic system, the hydraulic system includes a pilot pressure valve, a multi-way valve and a main pump, the multi-way valve and the pilot pressure valve are connected by a pipeline, the main pump and the multi-way valve are connected by a pipeline, the pilot pressure valve can control hydraulic oil to apply pilot pressure to the multi-way valve so as to drive the multi-way valve to change direction, an output shaft of the engine system is in transmission connection with an input shaft of the main pump, the engine system can drive the multi-way main pump to operate so as to enable hydraulic oil to pass through the valve to an actuating mechanism, and the method is characterized by comprising:
acquiring a pilot pressure value, an idle speed duration and a main pump pressure;
judging whether the pilot pressure value is greater than or equal to a set pressure value;
judging whether the idle speed time length is greater than or equal to a first set time length or not;
judging whether the pressure of the main pump is within a set pressure range or not;
when the pilot pressure value is greater than or equal to a set pressure value, the idling time period is greater than or equal to a first set time period, and the pressure of the main pump is in a set pressure range, switching the combustion parameters of the engine system from original combustion parameters to transient combustion parameters;
the transient combustion parameters at least comprise a first fuel injection quantity, a first fuel injection advance angle and a first rail pressure value; the original combustion parameters at least comprise a second fuel injection quantity, a second fuel injection advance angle and a second rail pressure value;
the first fuel injection quantity is smaller than the second fuel injection quantity, the first fuel injection advance angle is smaller than the second fuel injection advance angle, and the first rail pressure value is smaller than the second rail pressure value;
when the combustion parameter of the engine system is the transient combustion parameter, the injection mode of the engine is a first injection mode, and when the combustion parameter of the engine system is the original combustion parameter, the injection mode of the engine is a second injection mode, the first injection mode comprises pre-injection, main injection and post-injection, and the second injection mode comprises pre-injection and main injection.
2. The vehicle idle speed response control method according to claim 1, wherein determining whether the pilot pressure value is equal to or greater than a set pressure value includes:
acquiring the state of an engine;
judging whether the state of the engine is an overhun state or not;
if the state of the engine is an overhun state, judging whether the pilot pressure value is larger than or equal to a set pressure value;
the overlarun state is a state in which the required torque of the engine is zero and the fuel injection quantity of the engine is zero.
3. The vehicle idle speed response control method of claim 2 further comprising, prior to switching the combustion parameter of the engine system to the transient combustion parameter:
when the pilot pressure value is greater than or equal to a set pressure value, the idle speed time length is greater than or equal to a first set time length, and the pressure of the main pump is within a set pressure range, starting to record the duration time length of the pilot pressure value which is greater than or equal to the set pressure value;
judging whether the duration is less than a second set duration;
if the duration is less than a second set duration, the signal value of the pilot pressure value which is greater than or equal to the set pressure value is a true signal;
and switching the combustion parameter of the engine system to be the transient combustion parameter.
4. The vehicle idle speed response control method of claim 3,
if the duration is greater than or equal to the second set duration, the signal value of the pilot pressure value greater than or equal to the set pressure value is a false signal;
and maintaining the combustion parameters of the engine system as original combustion parameters.
5. The vehicle idle speed response control method according to claim 2, wherein when the pilot pressure value is smaller than a set pressure value, the combustion parameter of the engine system maintains the original combustion parameter;
when the idling time length is smaller than a first set time length, maintaining the original combustion parameters of the engine system;
when the main pump pressure is not in the set pressure range, the combustion parameter of the engine system maintains the original combustion parameter.
6. A vehicle comprising a controller, wherein the controller executes the vehicle idle speed response control method of any one of claims 1-5.
7. The vehicle of claim 6, characterized in that the hydraulic system further comprises:
the first pressure sensor is used for detecting pilot pressure applied to the multi-way valve by hydraulic oil output by the pilot pressure valve;
a second pressure sensor for detecting a main pump pressure of the main pump.
8. The vehicle of claim 6, characterized in that the vehicle is an excavator.
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| CN111733919A (en) * | 2020-06-29 | 2020-10-02 | 潍柴动力股份有限公司 | Anti-suction control method and control device for excavator hydraulic system and excavator |
| CN114233485A (en) * | 2021-12-22 | 2022-03-25 | 潍柴动力股份有限公司 | Power system control method, device and system and storage medium |
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