CN111219264B - Control method and device for improving constant-rotating-speed closed-loop capacity of diesel engine - Google Patents
Control method and device for improving constant-rotating-speed closed-loop capacity of diesel engine Download PDFInfo
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- CN111219264B CN111219264B CN202010130394.8A CN202010130394A CN111219264B CN 111219264 B CN111219264 B CN 111219264B CN 202010130394 A CN202010130394 A CN 202010130394A CN 111219264 B CN111219264 B CN 111219264B
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/002—Electric control of rotation speed controlling air supply
- F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
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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
- F02D41/0002—Controlling intake air
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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
- F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals
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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
- F02D41/0205—Circuit arrangements for generating control signals using an auxiliary engine speed control
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
Abstract
The invention discloses a control method for improving the constant rotating speed closed-loop capability of a diesel engine, relates to the constant rotating speed of the diesel engine, and mainly solves the technical problem that the requirements of the existing PI closed-loop method for realizing the constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate are difficult, wherein the control method comprises the following steps: acquiring the actual rotating speed B of the diesel engine; carrying out PI closed-loop control according to a difference value of an idling target set value A and an actual rotating speed B to obtain an idling closed-loop torque E, calculating according to the actual rotating speed B to obtain a rotating speed change acceleration C, and inquiring a pre-control torque curve according to the rotating speed change acceleration C to obtain a pre-control torque D; and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E. The invention also discloses a control device for improving the constant rotating speed closed-loop capability of the diesel engine. The invention can effectively meet the requirements of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate.
Description
Technical Field
The invention relates to constant rotating speed control of a diesel engine, in particular to a control method and a control device for improving the constant rotating speed closed-loop capability of the diesel engine.
Background
As shown in fig. 1 and 2, the current common method for closed-loop idling of diesel engines is as follows:
the idling target set value is A, the diesel engine obtains an actual rotating speed B, the actual rotating speed B is obtained by sensing the sensing column 2 on the gear 1 of the crankshaft through the sensor 3, the sensor 3 outputs a signal every time the sensing column 2 on the gear 1 rotates for one circle, and the actual rotating speed B can be obtained by calculating the total number of the signals in unit time. And performing PI closed-loop control according to the difference value of A and B, and outputting idle speed closed-loop torque E to control the operation of the diesel engine, wherein PI parameters are usually given in a standard quantity mode. In fact, according to the PI closed loop, a calibration person can meet the requirements of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate, the difficulty is high, and high comprehensive capacity is needed. Under some conditions, even calibration cannot meet the requirements of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate, so that the engine loses competitiveness.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and aims to provide a control method for improving the constant-rotating-speed closed-loop capability of a diesel engine, which can effectively meet the requirements of the constant-rotating-speed control of the diesel engine on transient response time and rotating speed overshoot rate.
The invention also aims to provide a control device capable of effectively meeting the requirements of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate and improving the constant rotating speed closed-loop capacity of the diesel engine.
In order to achieve the first purpose, the invention provides a control method for improving the constant rotating speed closed-loop capability of a diesel engine, which is used for obtaining the actual rotating speed B of the diesel engine; carrying out PI closed-loop control according to the difference value of the idling target set value A and the actual rotating speed B to obtain idling closed-loop torque E,
calculating to obtain a rotating speed change acceleration C according to the actual rotating speed B, and inquiring a pre-control torque curve according to the rotating speed change acceleration C to obtain a pre-control torque D;
and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E.
As a further improvement, the actual rotation speed B of the diesel engine is obtained by obtaining the rotation speed of the teeth of the gear of the crankshaft of the diesel engine as the actual rotation speed B.
Furthermore, each tooth of the gear is sensed by a tooth rotating speed sensor to obtain a tooth signal, and the tooth signal is filtered and output and is calculated to obtain the tooth rotating speed.
Further, second-order derivation calculation is performed on the actual rotating speed B to obtain the rotating speed change acceleration C.
Further, when the rotating speed change acceleration C exceeds a limit value, transient air intake compensation is carried out on the diesel engine.
Further, the transient intake compensation is to activate an on-off valve of an air storage tank and supplement fresh air to an intake passage of the diesel engine.
In order to achieve the second purpose, the invention provides a control device for improving the constant rotating speed closed-loop capacity of a diesel engine, which comprises an ECU, a gear arranged on a crankshaft of the diesel engine, a tooth rotating speed sensor, an air storage tank, an air inlet compensating pipe and a switch valve, wherein the air storage tank is connected with an air inlet channel of the diesel engine through the air inlet compensating pipe; the ECU induces each tooth of the gear through the tooth rotating speed sensor and calculates to obtain the actual rotating speed of the diesel engine as B, PI closed-loop control is carried out according to the difference value of an idling target set value A and the actual rotating speed as B to obtain idling closed-loop torque E, rotating speed change acceleration C is calculated according to the actual rotating speed B, and a pre-control torque curve is inquired according to the rotating speed change acceleration C to obtain pre-control torque D; and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
1. calculating a rotating speed change acceleration C through an actual rotating speed B, and inquiring a pre-control torque curve according to the rotating speed change acceleration C to obtain a pre-control torque D; after the pre-control torque D is compensated to the idle closed-loop torque E obtained by the traditional PI closed-loop control, the diesel engine is controlled to operate according to the idle closed-loop torque E, the difficulty of realizing the requirement of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate can be effectively reduced, the comprehensive capacity of calibration personnel is reduced, the applicability is enhanced, the problem of high requirement on the speed exchange rate in the grid connection of the diesel engine and the generator can be solved, and meanwhile, the problem that part of diesel engine models cannot meet the requirement on the transient response time and the rotating speed overshoot rate is solved.
2. According to the invention, the tooth rotating speed of the gear of the crankshaft of the diesel engine is obtained and is used as the actual rotating speed B, the actual rotating speed B is further refined, the rotating speed change rate condition can be more accurately identified, the transient response time is prolonged, and the development requirement is met.
3. According to the invention, when the change acceleration C of the rotating speed exceeds the limit value, transient air intake compensation is carried out on the diesel engine, fresh air is supplemented to the air inlet channel of the diesel engine, the sufficient air intake of the diesel engine is ensured, and the situation that the control transient response time can not meet the development requirement due to the insufficient air intake of the diesel engine can be avoided.
Drawings
FIG. 1 is a schematic diagram of a conventional technique for obtaining an actual rotation speed;
FIG. 2 is a block diagram of a PI closed loop control of the prior art;
FIG. 3 is a schematic diagram of the structure for obtaining actual rotation speed according to the present invention;
FIG. 4 is a control block diagram of the present invention;
fig. 5 is a schematic structural view of transient intake air compensation in the present invention.
Wherein: the device comprises a gear 1, an induction column 2, a sensor 3, a gear 4, an air storage tank 5, a switching valve 6, an air inlet channel 7, an ECU8 and an air inlet compensating pipe 9.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 3-5, a control method for improving the constant rotation speed closed-loop capability of the diesel engine obtains the actual rotation speed B of the diesel engine; carrying out PI closed-loop control according to the difference value of the idling target set value A and the actual rotating speed B to obtain idling closed-loop torque E;
calculating to obtain a rotating speed change acceleration C according to the actual rotating speed B, and inquiring a pre-control torque curve according to the rotating speed change acceleration C to obtain a pre-control torque D; the pre-control torque curve can be obtained by calibrating a test bench in advance;
and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E. The difficulty of realizing the requirements of constant rotating speed control of the diesel engine on transient response time and rotating speed overshoot rate can be effectively reduced, the comprehensive capability of calibration personnel is reduced, the applicability is enhanced, the problem of high speed exchange rate requirement in the grid connection of the diesel generator can be solved, and the problem that part of diesel engine models can not meet the requirements on transient response time and rotating speed overshoot rate is solved.
In this embodiment, the actual rotation speed B of the diesel engine is specifically obtained by obtaining the tooth rotation speed of the gear 1 of the crankshaft of the diesel engine and using the tooth rotation speed as the actual rotation speed B, specifically, each tooth of the gear 1 is sensed by the tooth rotation speed sensor 4 to obtain a tooth signal, and the tooth signal is filtered and output and calculated to obtain the tooth rotation speed, so that the actual rotation speed B is further refined, the rotation speed change rate condition can be identified more accurately, the transient response time is prolonged, and the development requirement is met. And carrying out second-order derivation calculation on the actual rotating speed B to obtain a rotating speed change acceleration C.
In this embodiment, when the speed change acceleration C exceeded the limit, carry out the compensation of transient state air admission to the diesel engine, the compensation of transient state air admission specifically is the switch valve 6 that activates the gas holder 5 and supplements fresh air to the intake duct 7 of diesel engine, guarantees that the diesel engine air input is sufficient, can avoid leading to controlling transient response time and can't satisfy the development requirement because the diesel engine air input is not enough.
A control device for improving the constant rotating speed closed loop capacity of a diesel engine comprises an ECU8, a gear 1 installed on a crankshaft of the diesel engine, a tooth rotating speed sensor 4, an air storage tank 5, an air inlet compensating pipe 9 and a switch valve 6, wherein the air storage tank 5 is connected with an air inlet channel 7 of the diesel engine through the air inlet compensating pipe 9, the switch valve 6 is arranged on the air inlet compensating pipe 9, and the ECU8 is electrically connected with the tooth rotating speed sensor 4 and the switch valve 6; the ECU8 senses each tooth of the gear 1 through the tooth speed sensor 4 and calculates to obtain the actual speed of the diesel engine as B, performs PI closed-loop control according to the difference value of the idling target set value A and the actual speed of the diesel engine as B to obtain idling closed-loop torque E, calculates to obtain speed change acceleration C according to the actual speed of the diesel engine, and queries a pre-control torque curve according to the speed change acceleration C to obtain pre-control torque D; and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (6)
1. A control method for improving the constant rotating speed closed loop capability of a diesel engine obtains the actual rotating speed B of the diesel engine; carrying out PI closed-loop control according to the difference value of the idling target set value A and the actual rotating speed B to obtain an idling closed-loop torque E,
calculating to obtain a rotating speed change acceleration C according to the actual rotating speed B, and inquiring a pre-control torque curve according to the rotating speed change acceleration C to obtain a pre-control torque D;
compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E;
and when the rotating speed change acceleration C exceeds a limit value, carrying out transient air intake compensation on the diesel engine.
2. The control method for improving the constant-speed closed-loop capability of the diesel engine according to claim 1, wherein the actual speed B of the diesel engine is obtained by obtaining the tooth speed of a gear (1) of a crankshaft of the diesel engine as the actual speed B.
3. The control method for improving the constant-rotating-speed closed-loop capacity of the diesel engine according to claim 2 is characterized in that each tooth of the gear (1) is sensed by a tooth rotating speed sensor (4) to obtain a tooth signal, and the tooth signal is filtered and output and is calculated to obtain the tooth rotating speed.
4. The control method for improving the constant-rotating-speed closed-loop capability of the diesel engine according to claim 1, wherein the rotating speed change acceleration C is obtained by performing second-order derivation calculation on the actual rotating speed B.
5. The control method for improving the constant-speed closed-loop capacity of the diesel engine according to claim 1, characterized in that the transient intake air compensation is realized by activating a switching valve (6) of an air storage tank (5) and supplementing fresh air to an air inlet channel (7) of the diesel engine.
6. A control device for improving the constant rotating speed closed-loop capacity of a diesel engine comprises an ECU (8) and a gear (1) arranged on a crankshaft of the diesel engine, and is characterized by further comprising a tooth rotating speed sensor (4), a gas storage tank (5), a gas inlet compensating pipe (9) and a switch valve (6), wherein the gas storage tank (5) is connected with a gas inlet channel (7) of the diesel engine through the gas inlet compensating pipe (9), the switch valve (6) is arranged on the gas inlet compensating pipe (9), and the ECU (8) is electrically connected with the tooth rotating speed sensor (4) and the switch valve (6); the ECU (8) senses each tooth of the gear (1) through the tooth rotating speed sensor (4) and calculates to obtain the actual rotating speed of the diesel engine as B, PI closed-loop control is carried out according to the difference value of the idling target set value A-the actual rotating speed as B to obtain idling closed-loop torque E, rotating speed change acceleration C is calculated according to the actual rotating speed B to obtain rotating speed change acceleration C, and a pre-control torque curve is inquired according to the rotating speed change acceleration C to obtain pre-control torque D; and compensating the pre-control torque D to the idle closed-loop torque E, and controlling the diesel engine to operate according to the idle closed-loop torque E.
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| CN202010130394.8A CN111219264B (en) | 2020-02-28 | 2020-02-28 | Control method and device for improving constant-rotating-speed closed-loop capacity of diesel engine |
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| CN202010130394.8A CN111219264B (en) | 2020-02-28 | 2020-02-28 | Control method and device for improving constant-rotating-speed closed-loop capacity of diesel engine |
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| CN112660104B (en) * | 2021-01-05 | 2022-07-05 | 吉林大学 | Starting control method for auxiliary power unit of extended range electric vehicle |
| CN113357036B (en) * | 2021-07-27 | 2023-05-23 | 潍柴动力股份有限公司 | Engine rotating speed adjusting method and device |
| CN114658556B (en) * | 2022-04-14 | 2023-08-25 | 广西玉柴船电动力有限公司 | Transient loading control method for electric control common rail diesel engine |
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| JP3564520B2 (en) * | 1997-05-26 | 2004-09-15 | 日産自動車株式会社 | Engine idle speed control device |
| CN201408199Y (en) * | 2009-03-26 | 2010-02-17 | 南京奥联汽车电子电器有限公司 | Rotating speed sensor for Hall gear |
| CN204572285U (en) * | 2015-05-12 | 2015-08-19 | 广西玉柴机器股份有限公司 | Diesel engine intake bucking-out system |
| US10060366B1 (en) * | 2017-06-02 | 2018-08-28 | Ford Global Technologies, Llc | Transient power control method for an engine that includes a compressor |
| CN109630287B (en) * | 2019-01-09 | 2021-01-05 | 关学慧 | Anti-impact anti-shake smooth control algorithm for automobile idle speed starting |
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