WO2003098021A1

WO2003098021A1 - Idling stop controlling method, idling stop controller, and idling stop controlling program

Info

Publication number: WO2003098021A1
Application number: PCT/JP2003/006311
Authority: WO
Inventors: Shinya Nozaki; Toshifumi Noda; Yukihiro Hayasaka
Original assignee: Bosch Automotive Systems Corporation
Priority date: 2002-05-21
Filing date: 2003-05-21
Publication date: 2003-11-27
Also published as: AU2003242343A1; JP3773886B2; JP2004044567A

Abstract

When a key switch (104) is turned On (Yes at step S1), a decision is made whether idling stop conditions are satisfied or not (step S2), and if the idling stop conditions are satisfied (Yes at step S2), a diesel engine (200) is stopped (step S3). A timer for measuring the time elapsed after stoppage of the diesel engine (200) is then actuated (step S5). Subsequently, a decision is made whether the time T elapsed after stoppage of the diesel engine (200) has reached a predetermined time α or not (step S6), and if the time T elapsed after stoppage of the diesel engine (200) has exceeded the predetermined time α (Yes at step S6), the diesel engine (200) is restarted (step S8).

Description

Specification

Idling stop control method, idling stop control device, and idling stop control program

The present invention is equipped with a diesel engine system including a diesel engine that uses a fuel alternative to light oil represented by DME (dimethyl ether) as a fuel, and a fuel supply device that supplies fuel to the diesel engine. The present invention relates to idling stop control of a vehicle. Background art

As a countermeasure against air pollution by diesel engines, attention has been paid to fuels that use DME (dimethyl ether), which has a clean exhaust instead of light oil, as fuel. DME fuel is a liquefied gas fuel, unlike diesel, which is a conventional fuel. In other words, DME has a property that it has a lower boiling point temperature than gas oil and, at atmospheric pressure, gas oil is liquid at room temperature while gas oil is liquid at room temperature. Therefore, when using DME fuel in a conventional diesel engine, if the supply pressure to the injection pump is low, the DME fuel will evaporate. Therefore, in order to supply liquid DME fuel to the injection pump, the supply pressure to the injection pump needs to be higher than that of light oil fuel.

Therefore, when DME fuel is used in a conventional diesel engine, the high supply pressure to the injection pump causes DME fuel remaining in the injection system after the diesel engine stops, causing the nozzle sheet of the fuel injection nozzle As a result, abnormal combustion such as knocking occurs when the diesel engine starts, and the diesel engine starts normally. Loud vibration and noise Will occur. In addition, DME has a low viscosity and is easy to leak as compared with light oil. Therefore, after the diesel engine is stopped, DME fuel vaporized in the cylinder fills the cylinder in a relatively short time. For this reason, the DME fuel supply system for diesel engines that use DME as fuel emits DME fuel remaining in the injection system after the diesel engine is stopped, leaks from the nozzle seat of the fuel injection nozzle into the cylinder of the diesel engine, and vaporizes. However, it is necessary to prevent the vaporized DME fuel from filling the cylinder. For this reason, when the diesel engine is stopped, the DME fuel in the injection pump and the means for collecting the DME fuel in the nozzle return pipe through which the DME fuel that overflows from the fuel injection nozzle flows into the fuel tank. Generally, a means for purging is provided.

By the way, conventional large trucks equipped with diesel engines using diesel fuel and large buses are equipped with a so-called idling stop control device that stops the diesel engine when the vehicle is temporarily stopped due to a red light or the like. Are becoming more common. This is a means for solving the problem of air pollution caused by exhaust gas emitted by a diesel engine during idling and the problem of noise caused by engine noise during idling. As disclosed in Japanese Patent Publication No. 89, the diesel engine is stopped when a predetermined idling stop condition is satisfied when the vehicle stops, and the diesel engine is restarted when the vehicle starts. As a result, it is possible to prevent exhaust gas and noise during a temporary stop such as a red light.

However, as described above, when the diesel engine is stopped, DME filled in the oil storage chamber of the DME fuel supply system and the nozzle return pipe to prevent abnormal combustion such as knocking when the diesel engine is restarted. Since the fuel is collected in the fuel tank, when the diesel engine starts, the DME fuel that was collected in the fuel tank when the diesel engine was stopped will be returned to the fuel tank. The engine must wait until the diesel engine is ready to start after the tank is filled from the tank into the oil reservoir of the DME fuel supply system.

Therefore, if the fuel tank is used to recover the DME fuel filled in the oil reservoir of the DME fuel supply device and the nozzle return pipe at the time of idling stop, the vehicle cannot restart quickly. Occurs. Especially in urban areas, there is a lot of traffic and there are many opportunities to stop due to traffic congestion, and there are many signalized intersections, so the need for idling stop is high. Therefore, if the vehicle cannot be restarted quickly after an idling stop, it may not only be inconvenient, but also cause traffic jams. Also, if the DME fuel filled in the oil reservoir of the DME fuel supply device and the nozzle return pipe is not collected in the fuel tank when idling is stopped, abnormal combustion such as knocking as described above may occur. I will. Disclosure of the invention

The present invention has been made in view of such a situation, and the problem is that abnormal combustion such as knocking occurs when the vehicle restarts from an idling stop in a vehicle equipped with a diesel engine system using DME as a fuel. It is to realize an idling stop control that enables the vehicle to restart quickly without any delay.

In order to achieve the above object, a first aspect of the present invention provides a diesel engine system including a diesel engine using a fuel alternative to light oil as fuel, and a fuel supply device for supplying the alternative fuel to the diesel engine. A method for controlling the idling stop of the vehicle, wherein when all the predetermined idling stop conditions are satisfied, the fuel injection state of the fuel supply device is set to a non-injection state without purging the alternative fuel, and the diesel engine is stopped. After stopping the diesel engine, before the time when the concentration of the leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration that causes abnormal combustion when the diesel engine is restarted. Restarting the diesel engine. This is a method of controlling the dripping top.

As described above, since the fuel is not purged at the time of idling stop, it is not necessary to supply fuel from the fuel tank to the oil reservoir of the fuel supply device again when the diesel engine is restarted. The diesel engine can be restarted. After the diesel engine is stopped, the diesel engine is restarted before the time when the concentration of the leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. Since the engine is started and brought into an idling operation state, fuel leaked into the combustion chamber can be burned, thereby preventing occurrence of abnormal combustion such as knocking when the diesel engine is restarted. Can be.

Thus, according to the idling stop control method according to the first aspect of the present invention, in a vehicle equipped with a diesel engine system that uses diesel fuel as an alternative fuel, abnormalities such as knocking when restarting from idling stop are performed. The advantage is that the vehicle can be restarted quickly without burning. A second aspect of the present invention is a method for controlling an idling stop of a vehicle equipped with a diesel engine system including a diesel engine using DME as fuel and a DME fuel supply device for supplying DME fuel to the diesel engine. When all of the predetermined idling stop conditions are satisfied, the DME fuel is not purged, the fuel injection state of the DME fuel supply device is set to the non-injection state, and the diesel engine is stopped. After the diesel engine is stopped, the leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches the concentration at which the abnormal combustion occurs when the diesel engine is restarted. An idling stop control method characterized by restarting the easel engine.

As described above, since the DME fuel is not purged at the time of idling stop, the DME fuel supply from the fuel tank is restarted when the diesel engine is restarted. There is no need to supply DME fuel to the oil reservoir etc. of the device, and the diesel engine can be restarted quickly when the vehicle starts. Also, after the diesel engine is stopped, the diesel engine is restarted before the time that the leakage fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches the concentration that causes abnormal combustion when the diesel engine is restarted. As a result, the DME fuel that has been helicopted in the combustion chamber can be burned, thereby preventing abnormal combustion such as knocking when the diesel engine is restarted. it can.

Thus, according to the idling stop control method according to the second aspect of the present invention, in a vehicle equipped with a diesel engine system using DME as a fuel, abnormal combustion such as knocking occurs when the vehicle restarts from an idler stop. There is an operational effect that the vehicle can be restarted quickly without restarting.

A third aspect of the present invention is the idling stop control method according to the second aspect, wherein after restarting the diesel engine, the diesel engine is stopped again after a predetermined time has elapsed.

The purpose of burning DME fuel leaked into the combustion chamber is achieved by operating the diesel engine for a very short time. Therefore, the diesel engine is restarted from the idling stop state to the idling operation state, and after a predetermined time has elapsed, that is, the time required for burning and consuming the DME fuel leaked into the combustion chamber has elapsed. Later, by stopping the diesel engine again, it is possible to continue the idlinda stop state while intermittently repeating the restart of the diesel engine.

Thus, according to the idling stop control method according to the third aspect of the present invention, in addition to the operation and effect according to the second aspect, the diesel engine is restarted from the idling stop state to enter the idling operation state, and thereafter, After the time required to burn the healed DME fuel in the combustion chamber has elapsed, the diesel Since the engine is stopped, the operation effect that the restart time of the diesel engine during the idling stop control can be minimized is obtained. According to a fourth aspect of the present invention, in the second aspect or the third aspect, the idling stop condition is that a rotation speed of the diesel engine is equal to or less than a predetermined rotation speed, and that a speed change of the diesel engine is performed. An idling stop control method, wherein the gear selection position of the vehicle is neutral, and the vehicle speed detected by the vehicle speed detection device mounted on the vehicle is 0 km / h. .

These idling stop conditions are as follows: when the vehicle is stopped (vehicle speed is 0 km / h), the connection between the diesel engine and each wheel is disconnected (the gear selection position is neutral), and the diesel engine is idling. This is for detecting that the vehicle is in an operation state (the number of revolutions is equal to or less than a predetermined number of revolutions). In other words, when all of these conditions are satisfied, the vehicle is stopped in an idling state, and by performing the idling stop control with this, accurate idling stop control can be performed.

Thus, according to the idling stop control method according to the fourth aspect of the present invention, in addition to the operational effects according to the second aspect or the third aspect, it is possible to accurately determine that the vehicle is stopped in the idling state. Since the detection can be performed, it is possible to obtain an operation and effect that accurate idling stop control can be performed.

A fifth aspect of the present invention is the idling stop control method according to the fourth aspect, wherein the vehicle is an MT vehicle, and the idling stop condition is that a clutch pedal is not depressed. It is.

If the vehicle is an MT (manual transmission) vehicle, the vehicle stops when the vehicle is idling by detecting the depression of the clutch pedal and setting the idling stop condition when the clutch pedal is not depressed. Can be accurately detected.

Thus, according to the idling stop control method according to the fifth aspect of the present invention, For example, in addition to the function and effect of the fourth aspect, when the vehicle is an MT vehicle, a function and effect of accurately detecting that the vehicle is stopped in an idling state can be obtained.

According to a sixth aspect of the present invention, in any one of the second to fifth aspects, the on / off state of the key switch of the vehicle is detected, and when the on state is detected, the idling is performed. It is determined whether all stop conditions are satisfied.If the FF state is detected, the diesel engine is stopped and the DME fuel purge process control is performed. Method.

If the key switch of the vehicle is turned off, it is possible to assume that it is not a temporary stop due to a red light or the like.Therefore, purge processing to recover DME fuel from the oil storage chamber etc. of the DME fuel supply system There is a need to do. Therefore, accurate idling stop control can be performed by detecting the key switch ONZOFF state of the vehicle and performing idling stop control only when the key switch is ON and all idling stop conditions are satisfied. However, when the vehicle is not stopped temporarily, the DME fuel supply device can be reliably purged.

Thereby, according to the idling stop control method according to the sixth aspect of the present invention, in addition to the effects of any of the second to fifth aspects, when the vehicle is not temporarily stopped, The operation and effect that the purging process of the DME fuel supply device can be surely performed can be obtained.

According to a seventh aspect of the present invention, in any one of the second to fifth aspects, the driving state of the vehicle is detected, and when the vehicle is in the driving state, all of the idling stop conditions are satisfied. It is determined whether or not the condition is satisfied.If the vehicle is not in the driving state, it is determined whether or not the vehicle is in the idling stop state.If not, the purge of the DME fuel is performed. An idling stop control method is characterized by performing processing control. If the vehicle is parked or stopped for a long time to leave the vehicle, rather than temporarily stopping at a red light, etc., collect DME fuel from the oil reservoir etc. of the DME fuel supply system Purge processing needs to be performed. Therefore, the driving state of the vehicle is detected, and if the vehicle is in the driving state, that is, if the vehicle is running or temporarily stopped in the idling driving state, it is determined whether or not the idling stop condition is satisfied. Is determined. The method of detecting the driving state of the vehicle may be, for example, directly detecting the number of rotations of the engine and determining that the vehicle is in the driving state based on the rotation of the engine, or detecting the hydraulic pressure level of the oil pressure gauge. However, the operating state of the engine may be detected based on the oil pressure level.

Therefore, by detecting the driving state of the vehicle and performing the idling stop control only when all the idling stop conditions are satisfied while the vehicle is in the driving state, it is possible to perform an accurate idling stop control. When the vehicle is not in the driving state, that is, when the vehicle is stopped with the engine stopped, it is determined whether the vehicle is in the idling stop state, and the vehicle is stopped in the idling stop state. When the vehicle is not in a running state, that is, when the vehicle is not running or is temporarily stopped in an idling state, the purge processing control of the DME fuel is performed. The supply device can be purged.

Thus, according to the idling stop control method according to the seventh aspect of the present invention, in addition to the operation and effect according to any of the second to fifth aspects, when the vehicle is not temporarily stopped, it can be reliably operated. Thus, the operation and effect of purging the DME fuel supply device can be obtained.

According to an eighth aspect of the present invention, in the seventh aspect, when the vehicle is not in a driving state, an ON / OFF state of a key switch of the vehicle is detected, and when an OFF state is detected, An idling stop control method is characterized in that it is determined that the vehicle is not in an idling stop state. As described above, when the vehicle is not in the driving state, the ON / OFF state of the key switch of the vehicle is detected. When the key switch is in the OFF state, it is determined that the vehicle is not in the idling stop state. In other words, when the key switch is off and the vehicle is not in operation, that is, when the vehicle is stopped, it is considered that the vehicle is not running and is not stopped temporarily in idling operation. Therefore, the purge process control of the DME fuel is performed. Therefore, the purge process of the DME fuel supply device can be surely performed when the vehicle is not temporarily stopped.

Thus, according to the idling stop control method according to the eighth aspect of the present invention, when the vehicle is not in the driving state, the ON ZOFF state of the key switch is detected, and when the key switch is in the OFF state, the purge is performed. By executing the process control, the purge process of the DME fuel supply device can be surely performed when the vehicle is not temporarily stopped, and the operation and effect according to the seventh aspect described above can be obtained. A ninth aspect of the present invention is directed to an idling stop for a vehicle equipped with a diesel engine system including a diesel engine fueled by an alternative fuel of light oil, and a fuel supply device for supplying the alternative fuel to the diesel engine. An idling stop judging means for judging that the diesel engine is in an idling stop state when all predetermined idling stop conditions are satisfied; and If it is determined that the engine is in the idling stop state, the non-dispersion stopping means for stopping the diesel engine by setting the fuel injection state of the fuel supply device to the non-injection state without purging the alternative fuel; Depending on the means of stopping the purge A non-parzogen-free stop time measuring means for measuring a time after the diesel engine is stopped; and a time measured by the non-pargency-free stop time measuring means. Before the time when the fuel reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted, the diesel engine is restarted. Means for controlling an idling stop.

According to the idling stop control device according to the ninth aspect of the present invention, in the idling stop control device, it is possible to obtain the same operational effects as those of the first aspect described above.

According to a tenth aspect of the present invention, there is provided an idling stop control device for a vehicle equipped with a diesel engine system including a diesel engine using DME as fuel and a DME fuel supply device for supplying DME fuel to the diesel engine. When all of the predetermined idling stop conditions are satisfied, the idling stop determining means for determining that the diesel engine is in the idling stop state; and If it is determined that the state is the state, the purging of the DME fuel is not performed, the fuel injection state of the DME fuel supply device is set to the non-injection state, and the diesel engine is stopped. By means of non-pargegen stop means A non-purge engine stop time measuring means for measuring a time after the diesel engine is stopped; and a time measured by the no-purge engine stop time measuring means, the leak from the fuel injection nozzle of the diesel engine into the combustion chamber. An idling stop control device, comprising: a non-dispersion restart means for restarting the diesel engine before a time at which fuel reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. It is.

According to the idling stop control device according to the tenth aspect of the present invention, in the idling stop control device, it is possible to obtain the same operational effects as in the second aspect described above.

According to a eleventh aspect of the present invention, in the tenth aspect, the non-purge engine restarting means for stopping the diesel engine restarted by the non-purge engine restart means after a predetermined time has elapsed has elapsed. Idling characterized by having It is a stop control device.

According to the idling stop control device of the eleventh aspect of the present invention, the same effect as that of the third aspect described above can be obtained in the idling stop control device.

According to a twenty-second aspect of the present invention, in the tenth aspect or the eleventh aspect, the idling stop condition is such that a rotation speed of the diesel engine is equal to or less than a predetermined rotation speed; An idling stop control device, wherein the gear selection position of the transmission of the diesel engine is neutral, and the vehicle speed detected by the vehicle speed detection device mounted on the vehicle is O km / h. It is. According to the idling stop control device according to the twelfth aspect of the present invention, the same effect as that of the fourth aspect described above can be obtained in the idling stop control device.

A thirteenth mode of the present invention is the idling mode according to the first or second mode, wherein the vehicle is an MT vehicle, and the idling stop condition is also that a clutch pedal is not depressed. It is a stop control device.

According to the idling stop control device according to the twelfth aspect of the present invention, the same effect as that of the fifth aspect described above can be obtained in the idling stop control device.

According to a fourteenth aspect of the present invention, in any one of the tenth aspect to the thirteenth aspect, means for detecting an ONZOFF state of a key switch of the vehicle, and detecting an ON state The idling stop determining means determines whether or not all of the idling stop conditions are satisfied. If the idling stop condition is detected, the diesel engine is stopped, and the purge processing control of the DME fuel is performed. And a purge processing control means for controlling the idling stop control.

According to the idling stop control device according to the fourteenth aspect of the present invention, In the ring stop control device, it is possible to obtain the same operation and effect as those in the sixth embodiment described above.

According to a fifteenth aspect of the present invention, in any one of the tenth aspect to the thirteenth aspect, means for detecting a driving state of the vehicle, and when the vehicle is in a driving state, The idling stop determination unit determines whether all the idling stop conditions are satisfied.If the vehicle is not in the driving state, a unit that determines whether the vehicle is in the idling stop state. An idling stop control device comprising: a purge process control unit that controls the purge process of the DME fuel when the idling stop state is not established. According to the idling stop control device according to the fifteenth aspect of the present invention, the same effect as the seventh aspect described above can be obtained in the idling stop control device.

According to a sixteenth aspect of the present invention, in the fifteenth aspect, when the vehicle is not in the driving state, the means for determining whether or not the vehicle is in the idling stop state includes a key switch of the vehicle. An idling stop control device characterized by detecting an ON / OFF state and, when detecting an OFF state, determining that the vehicle is not in an idling stop state.

According to the idling stop control device according to the sixteenth aspect of the present invention, in the idling stop control device, it is possible to obtain the same functions and effects as those of the eighth aspect described above.

According to a seventeenth aspect of the present invention, there is provided an electric control unit of the diesel engine system including the idling stop control device according to any one of the tenth aspect to the sixteenth aspect. is there.

According to the electric control unit according to the seventeenth aspect of the present invention, in the electric control unit, any one of the tenth aspect to the sixteenth aspect described above is provided. The operation and effect according to the invention can be obtained. An eighteenth aspect of the present invention is directed to an idling stop for a vehicle equipped with a diesel engine system comprising: a diesel engine fueled by an alternative fuel of light oil; and a fuel supply device for supplying the alternative fuel to the diesel engine. An idling stop control program for causing a computer to execute the control, wherein when all predetermined idling stop conditions are satisfied, an idling stop determination procedure for determining that the diesel engine is in an idling stop state; In the idling stop determination procedure, when it is determined that the diesel engine is in the idling stop state, the fuel injection state of the fuel supply device is set to the non-injection state without purging the alternative fuel. Stop the diesel engine A non-purge engine stop procedure, a non-purge engine stop time measurement procedure for measuring a time after the diesel engine is stopped by the no-purge engine stop procedure, and a non-purge engine stop time measurement procedure. The diesel engine is restarted before the elapsed time reaches a concentration at which the leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration that causes abnormal combustion when the diesel engine is restarted. Idling characterized by comprising a non-purge engine restart procedure, and a non-purge engine restart procedure to stop the diesel engine restarted after a predetermined time has elapsed in the non-purge engine restart procedure. This is a stop control program.

According to the idling stop control program according to the eighteenth aspect of the present invention, the same operation and effect as those of the first aspect described above can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as those of the first aspect described above can be provided to any mounted diesel engine vehicle.

A nineteenth aspect of the present invention is directed to a vehicle having a diesel engine system equipped with a diesel engine using DME as fuel and a DME fuel supply device for supplying DME fuel to the diesel engine. Computer with stop control An idling stop control program for executing the idling stop condition when all the predetermined idling stop conditions are satisfied, and determining that the diesel engine is in an idling stop state. In the idling stop determination procedure, when it is determined that the diesel engine is in the idling stop state, the fuel injection state of the DME fuel supply device is changed to the non-injection state without purging the DME fuel. A non-purgent engine stop procedure for stopping the diesel engine, a non-pargen engine stop time measuring procedure for measuring the time after the diesel engine is stopped by the non-purgent engine stop procedure, and a non-pargen engine stop time measuring procedure The time measured by A purge-free engine restart that restarts the diesel engine before the time that the leakage fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration that causes abnormal combustion when the diesel engine is restarted. An idling stop control program characterized by comprising: According to the idling stop control program according to the nineteenth aspect of the present invention, the same operation and effect as those of the second aspect described above can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as in the above-described second embodiment can be provided to any mounted diesel engine vehicle.

According to a twenty-fifth aspect of the present invention, in the nineteenth aspect, there is provided a non-purge engine restart procedure in which the diesel engine restarted in the non-purge engine restart procedure is stopped again after a predetermined time has elapsed. An idling stop control program comprising:

According to the idling stop control program according to the twenty-fifth aspect of the present invention, the same operation and effect as those of the third aspect described above can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as in the third aspect described above can be provided to any diesel engine vehicle mounted. I can do it.

According to a twenty-first aspect of the present invention, in the nineteenth aspect or the twenty-ninth aspect, the idling stop condition is that a rotational speed of the diesel engine is equal to or less than a predetermined rotational speed, The idling stop control program is characterized in that the gear selection position of the transmission is two-neutral, and the vehicle speed detected by the vehicle speed detection device mounted on the vehicle is 0 kmZh. .

According to the idling stop control program according to the twenty-first aspect of the present invention, the same operation and effect as those of the fourth aspect described above can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as in the above-described fourth embodiment can be provided to any mounted diesel engine vehicle.

According to a twenty-second aspect of the present invention, in the twenty-first aspect, the vehicle is an MT vehicle, and the idling stop condition is satisfied even when a clutch pedal is not depressed. This is a stop control program.

According to the idling stop control program according to the twenty-second aspect of the present invention, the same operation and effect as those of the fifth aspect described above can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as in the fifth aspect described above can be provided to any mounted diesel engine vehicle.

According to a twenty-third aspect of the present invention, in any one of the nineteenth aspect to the twenty-second aspect, a procedure for detecting an ONZOFF state of the key switch of the vehicle, A purge processing control procedure for executing the idling stop determination procedure and, when an OFF state is detected, stopping the diesel engine and performing a purge processing control of the DME fuel.

This is the top control program. According to the idling stop control program according to the twenty-third aspect of the present invention, it is possible to obtain the same operation and effect as the invention according to the sixth aspect described above, and to execute the idling stop control program. The same operation and effect as in the sixth aspect described above can be provided to any diesel engine vehicle equipped with a computer capable of performing the above-described operations.

According to a twenty-fourth aspect of the present invention, in any one of the nineteenth aspect to the twenty-second aspect, a procedure for detecting a driving state of the vehicle; and Performing the idling stop determination procedure; determining whether the vehicle is in the idling stop state if the vehicle is not in the driving state; and purging the DME fuel if the vehicle is not in the idling stop state. And a purge control procedure for performing a process control.

According to the idling stop control program according to the twenty-fourth aspect of the present invention, the same operation and effect as those of the seventh aspect can be obtained, and a computer capable of executing the idling stop control program can be provided. The same operation and effect as in the seventh aspect described above can be provided to any mounted diesel engine vehicle.

According to a twenty-fifth aspect of the present invention, in the twenty-fourth aspect, the step of determining whether or not the vehicle is in an idling stop state when the vehicle is not in the driving state, comprises: An idling stop control program characterized by detecting an ON / OFF state and, when detecting an OFF state, determining that the vehicle is not in an idling stop state.

According to the idling stop control program according to the twenty-fifth aspect of the present invention, it is possible to obtain the same operation and effect as those of the eighth aspect described above, and to provide a computer capable of executing the idling stop control program. The same operation and effect as in the eighth embodiment described above can be obtained for any diesel engine vehicle I can do it. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a schematic configuration of a diesel engine system according to the present invention.

FIG. 2 is a schematic configuration diagram of a DME fuel supply device of the diesel engine system according to the present invention.

FIG. 3 is a flowchart showing the idling stop control procedure according to the present invention.

FIG. 4 is a flowchart showing the idling stop control procedure according to the present invention, which detects the operating state of the engine before determining whether or not the idling stop condition is satisfied.

FIG. 5 is a flowchart showing the idling stop control procedure according to the present invention, and detects the ONZOFF state of the timer when the engine is stopped. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, a schematic configuration of a diesel engine system according to the present invention will be described. FIG. 1 is a block diagram showing a schematic configuration of a diesel engine system according to the present invention.

An ECU (Electric Control Unit Unit) 300 as a control device for inputting various state information of the vehicle and performing various controls such as a brake control is provided with an idling stop control device 10 for executing an idling stop control of the vehicle. I have it. The idling stop control device 10 includes information on the rotational speed of the diesel engine 200, transmission 101 Gear selection position information, vehicle speed information from the vehicle speed detection device 102, and operation state information of the clutch pedal 103 are input. Further, operation state information of the key switch 104 for performing power ON / OFF of the vehicle, starting operation of the diesel engine 200, and the like is input to the idling stop control device 10. Then, the idling stop control device 100 controls the DME fuel supply device 100 based on the input various state information, and performs idling stop control of the diesel engine 200. In the present embodiment, the vehicle is an MT vehicle.

The idling stop control device 10 functionally includes an idling stop determination unit 401 that determines that the diesel engine is in the idling stop state when all of the predetermined idling stop conditions are satisfied. On the other hand, when the idling stop determination section 401 determines that the diesel engine 200 is in the idling stop state, the fuel supply device 100 is not purged without performing the alternative fuel purging. A non-purge engine stop section 402 for stopping the diesel engine 200 by setting the fuel injection state of the diesel engine 200 to a non-injection state, and a time after the diesel engine 200 is stopped by the non-purge engine stop section 402. (Elapsed time in idling stop state) No-purge engine stop time measuring unit 403 that measures T, and no-purge engine stop time The time T measured by the measuring unit 403 is set to a concentration at which the leaked fuel from the fuel injection nozzle described later of the diesel engine 200 into the combustion chamber described later causes abnormal combustion when the diesel engine 200 is restarted. A non-purge engine restart section 404 for restarting the diesel engine 200 before the lapse of time.

Further, the idling stop control device 10 is functionally configured to stop the diesel engine 200 restarted in the non-purge engine restart section 404 after a predetermined time (T s) elapses, and to stop again. An engine re-stop section 405, a detection section 406 for detecting the ON / OFF state of the key switch 104 of the vehicle, and an idling stop determination section 4 when the ON state is detected. 0 by 1, said Idlin And a purge process control unit 407 that stops the diesel engine 200 and performs a purge process control of the DME fuel when it is determined whether all the stop conditions are satisfied and the OFF state is detected. .

Further, the idling stop control device 10 functionally includes a detection unit 408 that detects a driving state of the vehicle, and when the vehicle is in the driving state, the idling stop determination unit 401 detects all the idling stop conditions. A determination unit 409 for determining whether or not the vehicle is in an idling stop state when the vehicle is not in a driving state; and a determination unit for determining whether or not the vehicle is in an idling stop state when the vehicle is not in an idling stop state. And a purge process control unit 407 for performing a purge process control of the DME fuel.

Next, a schematic configuration of the DME fuel supply device 100 of the diesel engine 200 will be described. FIG. 2 is a schematic configuration diagram of the DME fuel supply device 100 of the diesel engine system according to the present invention.

The DME fuel supply device 100 that supplies DME fuel to the diesel engine 200 includes the injection pump 1 according to the present invention. The injection pump 1 includes the same number of injection pump elements 2 as the number of cylinders 31 of the diesel engine 200. The feed pump 5 pressurizes the DME fuel stored in the fuel tank 4 to a predetermined pressure and sends out the DME fuel to the feed pipe 52. The DME fuel outlet of the fuel tank 4 is provided below the level of the DME fuel in the fuel tank 4, and the feed pump 5 is arranged near the DME fuel outlet of the fuel tank 4. The DME fuel sent to the feed pipe 52 is filtered by the filter 51 and sent to the injection pump 1 via the three-way solenoid valve # 1. The three-way solenoid valve 71 is in the ON state during the injection state (during the operation of the diesel engine 200) and communicates in the direction of the arrow indicated by the symbol A.

The cam chamber (not shown) in the injection pump 1 is a dedicated lubrication system that is separated from the lubrication system of the diesel engine 200. The lubricating oil in the cam chamber mixed with the DME fuel leaked into the cam chamber in the injection pump 1 is separated into DME fuel and lubricating oil, and the lubricating oil is returned to the cam chamber. The DME fuel separated at the oil separator 6 passes through a check valve 62 that prevents the pressure in the cam chamber from dropping below atmospheric pressure. The compressor driven by the cam in the cam chamber 6 1 After being pressurized by the compressor 61, it is returned to the fuel tank 4 via the check valve 63 and the cooler 41. The check valve 63 is provided to prevent the DME fuel from flowing back from the fuel tank 4 to the cam chamber when the diesel engine 200 is stopped.

DME fuel pressurized from the fuel tank 4 to a predetermined pressure by the feed pump 5 and sent out from the respective injection pump elements 2 of the injection pump 1 via the injection pipe 3 in a predetermined amount at a predetermined timing. The fuel is fed to a fuel injection nozzle 32 provided in each cylinder 31 of the diesel engine 200. In FIG. 2, reference numeral 201 indicates a combustion chamber. The DME fuel overflowed from the injection pump 1 is returned to the fuel tank 4 via an overflow fuel pipe 8, a check valve 91 for determining the pressure of the overflow fuel, and a cooler 41. The DME fuel overflowed from each fuel injection nozzle 32 passes through an overflow fuel pipe 9 and a check valve 91 that determines the pressure of the overflow fuel and a cooler 41. Returned to fuel tank 4.

Further, when the diesel engine is stopped, the DME fuel supply device 100 removes the DME fuel remaining in the oil reservoir (not shown), the overflow fuel pipe 8 and the overflow fuel pipe 9 in the injection pump 1. As components of the “residual fuel collecting means” to be collected in the fuel tank 4, an aspirator 7, a three-way solenoid valve 71, and a two-way solenoid valve 72 are provided.

The aspirator 7 has an inlet 7a, an outlet 7b, and an inlet 7c. The inlet 7a and the outlet 7b are in straight communication with each other, and the inlet 7c is connected to the inlet 7a and the outlet 7 In this embodiment, the communication path is branched in a substantially vertical direction from the communication path between the communication paths. The outlet side of the communication passage (communication direction indicated by the arrow B) communicating when the three-way solenoid valve 71 is OFF is connected to the inlet Ίa, and the path to the fuel tank 4 via the cooler 41 Exit 7b is connected. In addition, the suction port 7c is connected to the two-way solenoid valve 72 which is in the OFF state during the injection state (during operation of the diesel engine 200). In the non-injection state (when the diesel engine 200 is stopped), the three-way solenoid valve 71 is turned off to form a communication passage in the direction indicated by the arrow B, and the two-way solenoid valve 72 is turned off. Turn ON to allow communication between the overflow fuel pipe 8 and the overflow fuel pipe 9 and the suction port 7c of the gas outlet 7 (in the direction of the arrow indicated by the symbol C). Therefore, the DME fuel sent from the feed pump 5 is not sent to the injection pump 1 but sent to the gas outlet 7, passes through the inlet 7 a to the outlet 7 b, and returns to the fuel tank 4 via the cooler 41. Then, it is sent from feed pump 5 to Aspire 7 again. In other words, the DME fuel liquid circulates through the aspirator 7. The DME fuel remaining in the oil reservoir, the overflow fuel pipe 8, and the overflow fuel pipe 9 in the injection pump 1 is changed by the flow of the DME fuel liquid flowing through the inlet 7a and the outlet 7b. The fuel is sucked from the suction port 7 and collected in the fuel tank 4.

Subsequently, an idling stop control procedure according to the present invention will be described. The idling stop control device 10 is a control device which is functionally configured as shown in FIG. 1 and includes a computer, and which executes the idling stop control procedure according to the present invention. By executing the stop control program on a computer, the DME fuel supply device 100 is controlled to perform idling stop control of the diesel engine 200.

FIG. 3 is a flowchart showing an idling stop control procedure according to the present invention. The flowchart is a procedure that is repeatedly executed at a fixed period from the time when the power supply of the vehicle is turned on. First, it is determined whether or not the key switch 104 is ON (step S1). If the key switch 104 is ON (Yes in step S1), then it is determined whether or not the idling stop condition is satisfied (step S2). For example, if the vehicle stops at the intersection with the red signal and the idling stop condition is satisfied (Yes in step S2), that is, the rotational speed information of the diesel engine 200 is equal to or less than the predetermined rotational speed. That the gear selection position information of the transmission 101 is 2 neutral, that the vehicle speed information from the vehicle speed detection device 102 is 0 km / h, and that the clutch pedal 103 is not depressed If all of the above conditions are met, it is determined that the diesel engine 200 is idling and the vehicle is temporarily stopped, and the diesel engine 200 is stopped to stop idling. State (step S3). This idling stop state is a short-time temporary engine stop, unlike a long-time engine stop such as when parking. Specifically, the injection pump element 2 of the injection pump 1 is set to the non-injection state, and the supply of the DME fuel to the fuel injection nozzles 32 is stopped. At this time, the purging process performed after the normal stoppage of the diesel engine 200, such as when parking, is not performed. Therefore, when the vehicle is restarted from the idling stop state, the diesel engine 200 can be quickly restarted.

Subsequently, it is determined whether or not the timer for measuring the time after the diesel engine 200 has stopped, that is, the elapsed time since switching to the idling stop state, is operating (step S4). If the timer 1 is not operating (No in step S4), the timer is operated to measure the elapsed time of the idling stop state (step S5). If the timer is running (Yes in step S4), the timer 1 continues measuring the elapsed time of the idling stop state. The evening timer is a so-called soft timer, and measures time by counting an internal clock or the like of the idling stop control device 10. Subsequently, it is determined whether or not the elapsed time T of the idling stop state has reached the predetermined time 0; (step S6). Here, the DME fuel remaining in the injection pipe 3 leaks from the nozzle seat portion of the fuel injection nozzle 32 into the cylinder 31 and evaporates, and the vaporized DME fuel remains in the cylinder 31 for a predetermined time. Is set to a time shorter than the time required to reach the concentration at which abnormal combustion occurs when the diesel engine 200 is restarted. If the elapsed time in the idling stop state is less than the predetermined time (No in step S6), the measurement by the timer is continued and the procedure is terminated. On the other hand, if the time T after stopping the diesel engine 200 exceeds the predetermined time a (Yes in step S6), the timer is stopped (step S7), and the stopped diesel engine 200 is stopped. 0 is restarted to return to the idling operation state (step S8). As a result, before the DME fuel vaporized in the cylinder 310 reaches a concentration at which abnormal combustion occurs when the diesel engine 200 is restarted, the cylinder 31 is charged by the restart of the diesel engine 200. The burned DME fuel can be burned and consumed, thereby preventing the occurrence of abnormal combustion such as knocking.

Further, in step S8, the diesel engine 200 is restarted, and after a predetermined time Ts elapses, the diesel engine is stopped again. The purpose of burning the DME fuel leaked into the combustion chamber 201 is achieved by operating the diesel engine 200 for a very short time. Therefore, the diesel engine 200 is restarted from the idling stop state to the idling operation state, and thereafter, after a predetermined time Ts has elapsed, that is, the DME fuel leaked into the combustion chamber 201 By stopping the diesel engine 200 again after the time T s necessary for burning and consuming the fuel has elapsed, the idling stop state is maintained while the diesel engine 200 is intermittently repeated. You can do it. In the present embodiment, as the control flow, after the diesel engine 200 is restarted, the predetermined time set beforehand is set. It is configured as a closed loop that stays there until T s has elapsed.

Also, in the idling stop state, for example, when the signal changes from red to blue, an operation for starting driving by the driver (depressing the clutch pedal 103, changing the gear selection position from neutral to low, etc.) The idling stop condition is not satisfied. This change, that is, the signal changes from red to blue under the idling stop state and the vehicle is immediately switched to the state where the driver can operate immediately by operating the driver, is that the idling stop condition is not satisfied in step S2. It is recognized by judging (No in step S2). After this determination, the timer is stopped (step S9), and the diesel engine 200 is immediately started (step S10) to return to a state where the vehicle can run with the green light, and the procedure ends. Then, when the driver depresses the accelerator pedal, the car starts running immediately and can leave the intersection.

If the key switch 104 is not in the ON state in step S1 (No in step S1), then it is determined whether the key switch 104 is in the OFF state (step S1). 1). If the key switch 104 is not in the OFF state (No in step S11), that is, the operation state of the key switch 104 is neither ON nor OFF. For example, if the power switch is only in the ON state, the procedure is terminated. You. On the other hand, when the key switch 104 is in the OFF state (Yes in step S11), it is determined whether the diesel engine 200 is stopped (step S12). If the diesel engine 200 has already stopped (Yes in step S12), the procedure ends. If the diesel engine 200 is not stopped (No in step S12), the diesel engine 200 is stopped (step S13), and the DME fuel supply device is operated by the “residual fuel recovery means” described above. A process (purge process) for collecting the DME fuel remaining in the fuel tank 4 into the fuel tank 4 is executed (step S14).

In this way, when the vehicle restarts from the idling stop state, the knock Abnormal combustion such as a king does not occur, and quick restart is possible.

As another embodiment, in the diesel engine system shown in the above-described embodiment, an engine operating state is detected before determining whether or not the idling stop condition is satisfied.

FIG. 4 is a flowchart showing the idling stop control procedure according to the present invention, which detects the operating state of the engine before determining whether the idling stop condition is satisfied. The flowchart is a procedure that is repeatedly executed at a fixed cycle from the time when the power supply of the vehicle is turned on.

First, it is determined whether or not the diesel engine 200 is in operation (step S21). Here, as described above, the determination of whether the vehicle is in the driving state is performed when the vehicle is running or when the engine is idling and the vehicle is temporarily stopped. In this case, for example, when the vehicle is stopped with the engine stopped, it is determined that the vehicle is not in the driving state. The method for detecting the operating state may be any detection method as long as it can determine whether the diesel engine 200 is operating or stopped.For example, the rotational speed of the diesel engine 200 may be directly detected. The operating state may be determined based on the rotation of the diesel engine 200, or the operating level of the diesel engine 200 may be indirectly detected by detecting the oil pressure level of the oil pressure gauge. May be detected.

If the diesel engine 200 is operating (Yes; in step S21), it is next determined whether or not an idling stop condition is satisfied (step S22). When the idling stop condition is satisfied, the following steps S22 to S29 have the same control procedure as steps S2 to S9 of the flowchart shown in FIG. Therefore, the description is omitted.

On the other hand, when the diesel engine 200 is not in the operating state (No in step S21), it is determined whether the idling stop condition is satisfied (step S30). This is because the “not in driving state” This is performed to determine whether the vehicle is in the top position or due to other parking.

If the idling stop condition is satisfied (Yes in step S30), that is, as described above, the rotation speed information of the diesel engine 200 is equal to or lower than the predetermined rotation speed, and the gear selection position of the transmission 101 If the information is neutral, vehicle speed information from vehicle speed detector 102 is 0 km / h, and clutch pedal 103 is not depressed, diesel It is determined that the vehicle is temporarily stopped with the engine 200 stopped, that is, the vehicle is in the idling stop state, and the timer for measuring the elapsed time T of the idling stop state is operating. The control flow is entered (step S24).

On the other hand, if the idling stop condition is not satisfied (No in step S30), that is, if the idling stop condition described above is not satisfied while the diesel engine .200 is stopped, Then, it is determined whether or not the key switch 104 is ON (step S31). In other words, whether the vehicle was in the idlinda stop state at the stop of the red light but changed to the green signal and the driver performed the operation to start driving and the idling stop condition was not satisfied, or Whether the driver is parked or stopped for the purpose of leaving the vehicle is determined by the ON / OFF state of the key switch 104. Note that the determination of these states is not limited to the determination based on the ON / OFF state of the key switch 104 described in the present embodiment, and may be determined by other detection means.

That is, when the key switch 104 is in the 〇N state (Yes in step S31), the state changes from a red light to a green light, and it is determined that the idling stop state is released and the vehicle is about to start. Then, after turning off the timer that was operating during the idling stop state (step S32), the diesel engine is stopped. The vehicle 200 is immediately started (step S33), the vehicle is returned to a running state, and the procedure is terminated.

On the other hand, if the key switch 104 is in the OFF state (No in step S31), it is determined that the driver has parked or stopped for the purpose of leaving the vehicle for a long time. A process (purge process) of recovering the DME fuel remaining in the DME fuel supply device 100 to the fuel tank 4 is executed by the “residual fuel recovery means” (step S34).

Further, as another embodiment, in the idling stop control procedure shown in FIG. 4, an on / off state of the timer is detected when the engine is stopped.

FIG. 5 is a flowchart showing the idling stop control procedure according to the present invention, and detects the ONZOFF state of the timer when the engine is stopped. The flowchart is a procedure that is repeatedly executed at a constant cycle from the time when the power supply of the vehicle is turned on.

The control procedure shown in step S41 to step S49 of the flowchart shown in the drawing is the same as the control procedure shown in step S21 to step S29 of the flowchart shown in FIG.

When the diesel engine 200 is not operating (No in step S41), that is, when the diesel engine 200 is stopped, a timer for measuring the elapsed time T of the idling stop state is subsequently provided. It is determined whether or not it is operating (step S50). If the timer is operating (Yes in step S50), it is determined that the vehicle is in the idling stop state, and the flow of control for determining whether the time T of one timer has reached the predetermined time α is performed. Enter (Step S46).

On the other hand, when the timer is not operating (No in step S50), it is determined whether or not the key switch 104 is ON (step S51). That is, in the present embodiment, when the diesel engine 200 is stopped, It is determined from the operation state of the timer that is operating during the idling stop state whether or not the diesel engine 200 is stopped in the idling stop state. In other words, when the diesel engine 200 is stopped, whether the vehicle is temporarily stopped due to a red light, etc., or if the driver is parked or stopped for a long time to leave the vehicle This is determined by the operation status of the timer. Hereinafter, the procedure shown in steps S51 to S54 is the same as the procedure shown in steps S31 to S34 of the flowchart shown in FIG.

Further, as another embodiment, in each of the above embodiments, the vehicle is an AT (automatic transmission) vehicle. In the case of an AT vehicle, since there is no clutch pedal 103, the idling stop condition is that the rotation speed information of the diesel engine 200 is equal to or lower than a predetermined rotation speed, and the gear selection of the transmission 101 All the conditions that the position information is neutral and that the vehicle speed information by the vehicle speed detection device 102 is 0 kmZh are satisfied. is there. In this way, the present invention can be implemented in an AT vehicle, and the operation and effect of the present invention can be obtained.

It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the invention described in the claims, and it is to be understood that these are also included in the scope of the present invention. Needless to say. Industrial applicability

ADVANTAGE OF THE INVENTION According to the present invention, in a vehicle equipped with a diesel engine system using DME as a fuel, an idling stop control capable of quickly restarting the vehicle without causing abnormal combustion such as knocking when restarting from the idling stop. Becomes possible.

Claims

The scope of the claims

1. A method for controlling an idling stop of a vehicle equipped with a diesel engine system including a diesel engine using a fuel alternative to light oil as fuel and a fuel supply device for supplying the alternative fuel to the diesel engine,

When all of the predetermined idling stop conditions are satisfied, the diesel engine is stopped without changing the fuel injection state of the fuel supply device without purging the alternative fuel, and after stopping the diesel engine. The diesel engine is restarted before the time when the fuel leaked from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration that causes abnormal combustion when the diesel engine is restarted. And an idling stop control method.

2. An idling stop control method for a vehicle equipped with a diesel engine system including a DME-fueled diesel engine and a DME fuel supply device for supplying the DME fuel to the diesel engine,

When all the predetermined idling stop conditions are satisfied, the DME fuel is not purged, the fuel injection state of the DME fuel supply device is set to the non-injection state, the diesel engine is stopped, and after the diesel engine is stopped, Restarting the diesel engine before the time when the concentration of the leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. Idling stop control method.

3. The idling stop control method according to claim 2, wherein after restarting the diesel engine, the diesel engine is stopped again after a predetermined time has elapsed.

4. The idling stop condition according to claim 2, wherein the idling stop condition is that the rotational speed of the diesel engine is equal to or lower than a predetermined rotational speed. An idling stop control method, wherein a gear selection position of a gin transmission is neutral, and a vehicle speed detected by a vehicle speed detection device mounted on the vehicle is 0 km / h.

5. The idling stop control method according to claim 4, wherein the vehicle is an MT vehicle, and the idling stop condition is that a clutch pedal is not depressed.

6. The vehicle according to any one of claims 2 to 5, wherein the ON / OFF state of the key switch of the vehicle is detected, and if the ON state is detected, it is determined whether all of the idling stop conditions are satisfied. And when the OFF state is detected, the diesel engine is stopped and the purge control of the DME fuel is performed.

7. The method according to any one of claims 2 to 5, wherein the driving state of the vehicle is detected, and when the vehicle is in the driving state, it is determined whether all of the idling stop conditions are satisfied. When the vehicle is not in the driving state, it is determined whether or not the vehicle is in the idle Linda stop state, and when not in the idle Linda stop state, the purge processing control of the DME fuel is performed. Characteristic idling stop control method.

8. In claim 7, when the vehicle is not in the driving state, the on / off state of the key switch of the vehicle is detected, and when the off state is detected, it is determined that the vehicle is not in the idling stop state. An idling stop control method.

9. An idling stop control device for a vehicle equipped with a diesel engine system including a diesel engine fueled by a diesel fuel alternative fuel and a fuel supply device for supplying the alternative fuel to the diesel engine,

When all of the predetermined idling stop conditions are satisfied, the idling stop judgment is performed to determine that the diesel engine is in the idling stop state. Setting means,

When the idling stop determining means determines that the diesel engine is in the idling stop state, the fuel injection state of the fuel supply device is set to the non-injection state without purging the alternative fuel, and the diesel engine is stopped. Means for stopping the engine without purging,

A non-purging engine stop time measuring means for measuring a time after the diesel engine is stopped by the non-purge engine stopping means, and a fuel injection nozzle of the diesel engine. And a purge-free engine restarting means for restarting the diesel engine before the time when the concentration of the fuel leaking into the combustion chamber from the fuel tank reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. The idling stop control device which was the feature.

10. An idling stop control device for a vehicle equipped with a diesel engine system including a diesel engine fueled by DME and a DME fuel supply device for supplying DME fuel to the diesel engine,

An idling stop determining means for determining that the diesel engine is in an idling stop state when all of the predetermined idling stop conditions are satisfied;

When the idling stop determination means determines that the diesel engine is in the idling stop state, the DME fuel supply device is not purged without changing the fuel injection state of the DME fuel supply device. Non-purge engine stopping means for stopping the diesel engine as a state;

A non-purgent engine stop time measuring means for measuring a time after the diesel engine is stopped by the no-purge engine stop means;

The time measured by the non-purge engine stop time measuring means is determined by the amount of leaked fuel from the fuel injection nozzle of the diesel engine into the combustion chamber. An idling stop control device, comprising: a non-purge engine restarting means for restarting the diesel engine before a time to reach a concentration at which abnormal combustion occurs when the gin is restarted.

11. The idling engine according to claim 10, further comprising: a non-purge engine restart means for stopping the diesel engine restarted by the no-purge engine restart means after a predetermined time has elapsed. Stop control device.

12. In Claim 10 or 11, the idling stop condition is that the rotation speed of the diesel engine is equal to or lower than a predetermined rotation speed, and that the gear selection position of the transmission of the diesel engine is An idling stop control device, wherein the idling stop control device is neutral, and a vehicle speed detected by a vehicle speed detection device mounted on the vehicle is 0 kmZh.

13. The idling stop control device according to claim 12, wherein the vehicle is an MT vehicle, and the idling stop condition is also that a clutch pedal is not depressed.

1 4. The method according to any one of claims 10 to 13, wherein: a means for detecting an ON / OFF state of the key switch of the vehicle; and, when the ON state is detected, the idling stop determination means. It is determined whether or not all of the idling stop conditions are satisfied, and if an OFF state is detected, the diesel engine is stopped, and a purge process control unit that performs a purge process control of the DME fuel is provided. An idling stop control device characterized by the following.

15. The method according to any one of claims 10 to 13, wherein the idling stop is performed by means for detecting a driving state of the vehicle, and when the vehicle is in a driving state, the idling stop determining means. Means for judging whether or not all the conditions are satisfied; and, when the vehicle is not in the driving state, means for judging whether or not the vehicle is in the idling stop state. Purge control means for performing a purge control of the DME fuel. An idler stop control device characterized by the following.

16. The method according to claim 15, wherein the means for determining whether or not the vehicle is in the idling stop state when the vehicle is not in the driving state detects an ON / OFF state of a key switch of the vehicle, An idling stop control device, which determines that the vehicle is not in an idling stop state when detecting an OFF state.

17. An electric control unit for the diesel engine system, comprising the idling stop control device according to any one of claims 10 to 16.

18. The computer causes the computer to execute the idling stop control of the vehicle equipped with the diesel engine system including the diesel engine using the diesel fuel as the alternative fuel and the fuel supply device for supplying the alternative fuel to the diesel engine. Stop control program for

An idling stop determination procedure for determining that the diesel engine is in an idling stop state when all of the predetermined idling stop conditions are satisfied;

In the idling stop determination procedure, when it is determined that the diesel engine is in the idling stop state, the fuel injection state of the fuel supply device is set to the non-injection state without purging the alternative fuel. A non-pargentine stopping procedure for stopping the diesel engine;

A non-purgent engine stop time measuring procedure for measuring a time after the diesel engine is stopped by the non-purge engine stop procedure;

The time measured by the non-purge engine stop time measurement procedure elapses a time when the fuel leaked from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. Before the di

'No-pargengin restart procedure to restart' An idling stop control program, comprising: a non-purge engine restart procedure for stopping the diesel engine restarted in the non-purge engine restart procedure after a predetermined time has elapsed.

1 9. Idling to cause the computer to execute idling stop control of a vehicle equipped with a diesel engine system that includes a diesel engine that uses DME as fuel and a DME fuel supply device that supplies DME fuel to the diesel engine A stop control program,

When all of the predetermined idling stop conditions are satisfied, an idling stop determination procedure for determining that the diesel engine is in an idling stop state;

In the idling stop determination procedure, when it is determined that the diesel engine is in the idling stop state, the DME fuel is not purged and the fuel injection state of the DME fuel supply device is set to the non-injection state. A procedure for stopping the diesel engine to stop the diesel engine; and

The time measured by the non-purge engine stop time measurement procedure elapses a time when the fuel leaked from the fuel injection nozzle of the diesel engine into the combustion chamber reaches a concentration at which abnormal combustion occurs when the diesel engine is restarted. Before restarting the diesel engine.

20. The idling according to claim 19, further comprising: a non-purge engine restarting procedure for stopping the diesel engine restarted in the restarting procedure without the purge engine after a predetermined time has elapsed. Stop control program.

21. The engine according to claim 19 or 20, wherein the idling stop condition is that the rotational speed of the diesel engine is equal to or lower than a predetermined rotational speed. An idling stop control program, wherein the gear selection position of the transmission of the engine is neutral, and the vehicle speed detected by the vehicle speed detection device mounted on the vehicle is 0 kmZh.

22. The idling stop control program according to claim 21, wherein the vehicle is an MT vehicle, and the idling stop condition is also that a clutch pedal is not depressed.

23. The method according to any one of claims 19 to 22, wherein the step of detecting the ONZ FF state of the key switch of the vehicle and the step of determining the idling stop when the ON state is detected are executed. And an idling stop control program, comprising: when an OFF state is detected, stopping the diesel engine and performing a purge process control procedure for performing a purge process control of the DME fuel.

2 4. The method according to any one of claims 19 to 22, wherein a step of detecting a driving state of the vehicle and a step of determining an idling stop when the vehicle is in a driving state are executed. When the vehicle is not in the driving state, a procedure for determining whether the vehicle is in the idling stop state, and when the vehicle is not in the idling stop state, a purge processing control procedure for performing the purge processing control of the DME fuel. An idling stop control program characterized by having:

25. The method according to claim 24, wherein the step of determining whether or not the vehicle is in the idling stop state when the vehicle is not in the driving state includes detecting an ON / OFF state of a key switch of the vehicle. And determining that the vehicle is not in the idling stop state when detecting the OFF state.