JPS63259167A - Starter for diesel engine - Google Patents

Abstract

PURPOSE:To permit an engine to be easily further properly started, by providing an automatic/manual selector switch and automatically starting the engine in accordance with the decision result of an warmed condition decision means when this selector switch is selected to a position of automatic starting. CONSTITUTION:If an automatic/manual selector switch 20 is set to, for instance, the automatic position, a control unit 10 discriminates in its warmed condition decision means 12 the warmed condition of an engine being based on signals from water temperature sensor 6, key switch 8, etc. And the control unit 10 actuates an automatic starting means 13, when the engine is placed in an unwarmed condition, while a manual starting means 14 when the engine is placed in the warmed condition. Here the automatic starting means 13, after it conducts an electric current in a glow plug 4 through a driving means 15, starts a starter motor 5 through a driving means 16 after the predetermined time set by a timer 17. While the manual starting means 14 supplies an output signal to each driving means 15, 16 by each on-signal of the key switch 8 and a starter switch 9.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a starting device for a swirl chamber type diesel engine equipped with a glow plug, and more particularly to a starting device with improved operability.

[Conventional technology]

Conventionally, in a swirl chamber engine, when starting the engine,
The glow plug must be heated before starting the starter, but it takes about 3.5 seconds to heat the glow plug, so compared to a gasoline engine, it takes longer to start the engine, and the waiting time is longer. If the starter is started when the glow plugs are not sufficiently heated, the engine will not start properly and will have to crank for a long time, so the driver may have to keep the engine key in the on (glow plug heating) position for a while. There must be. For this reason, as shown in Japanese Unexamined Patent Publication No. 55-156226, etc., the waiting time for heating the glow plug is shortened, and even if the starter switch is turned on instantly, the starter motor is not started, and the glow plug is not fully heated. It has been proposed that the starter rotates after the starter is heated to a certain temperature.

[Problems to be solved by the invention]

By the way, in the conventional example described above, the glow plug is heated after the starter switch is turned on, and then the starter is started, so 2. Even when the engine is warmed up to such an extent that heating the glow plugs is not necessary, the glow plugs have to be heated, resulting in wasted energy. Also,
When the engine is difficult to start, the starter continues to be driven for a long time, increasing the burden on the battery and causing the fi
There is a problem that it becomes unusable in the case of evil. Another problem is that if the engine is started while the transmission is in a shift position other than neutral, the vehicle will run and an unexpected accident may occur. Further, depending on the driver, if based on the driver's experience, he prefers manual starting rather than automatic starting, there is a problem that automatic starting alone lacks versatility in engine starting. The present invention has been proposed to solve the above-mentioned problems, and when starting the engine, it is possible to arbitrarily select between automatic start and manual start, and when automatic start is selected, the transmission is in neutral. In position,
The engine can be started smoothly by turning on the starter switch immediately after inserting the engine key, reducing the waiting time for the glow plugs to heat up, and when warming up, the starter motor can be turned on immediately without heating the glow plugs. It saves energy by starting the starter motor, and prevents battery consumption due to long-term operation of the starter motor.
Another object of the present invention is to provide a diesel engine starting device that can prevent the danger of the vehicle starting to run when the engine starts, and that allows the engine driver to freely select between automatic starting and manual starting. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides an automatic start control system as a means for controlling start in a vehicle equipped with a diesel engine equipped with a glow plug and a transmission.
Neutral position determining means comprising a manual changeover switch, a neutral switch for detecting a neutral position of the transmission, and a control unit, and for determining the neutral position of the transmission based on a signal from the neutral switch, for the control unit; By switching the automatic/manual changeover switch to automatic and determining by the neutral position determination means that the transmission is at the 22-toral position, the glow plug heating is determined based on the engine coolant temperature. warm-up state determining means for determining whether the warm-up condition is necessary; and automatic starting means for automatically heating the glow plug when the cooling water temperature is low and starting the starter motor after a predetermined time to automatically start the engine. When the coolant temperature is high, the glow plug is not heated, the starter motor is activated by a manual starter switch ON signal to start the engine, and the automatic/manual changeover switch is switched to manual. and a manual starting means for manual starting in case of a manual start.

[For production]

Based on the above configuration, the present invention switches the automatic/manual changeover switch to automatic start, and when the transmission is in the neutral position by the neutral switch, when the engine coolant temperature is lower than the set temperature by the warm-up state determination means, When the engine key is turned on, heating of the glow plug is automatically started, and after a predetermined time, the starter is driven for a preset time to automatically start the engine. On the other hand, if the engine coolant temperature is higher than the set temperature, there is no need to heat the glow plug, so insert the engine key, turn on the key switch, and then turn the starter switch to the on position to start the engine manually. Starts instantly. Further, by switching the automatic/manual changeover switch to manual starting, manual starting can be performed at any time.

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is an overall configuration diagram of a diesel engine starting device, FIG. 2 is a block diagram showing the configuration of a control unit, and FIG. 3 is a flowchart showing a starting operation. In FIG. 1, reference numeral 1 denotes a diesel engine, and an auxiliary combustion chamber (vortex chamber) 2 of this diesel engine 1 is provided with an injector 3 and a glow plug 4. When the engine 1 is started by being driven by the starter motor 5, the glow plug 4 is energized and heated to improve the ignitability and startability of the engine 1. Reference numeral 6 is a water temperature sensor. Reference numeral 7 is the engine key. When the engine key is inserted, it turns on. When the engine key is turned, the key switch 8.
Starter switch 9 is turned on. Reference numeral 10 denotes a control unit consisting of a microcomputer, etc., which controls fuel injection amount, idle speed, fuel injection timing, intake throttle, etc., as well as a water temperature sensor 6 and an automatic/manual changeover switch 202 (shown in the figure). input the output signal of the neutral switch 21 that detects the neutral position of the transmission, and
It is equipped with the functions of an engine starting device as shown in the block diagram in the figure. In FIG. 2, when the automatic/manual changeover switch 20 is set to automatic, the cooling water temperature signal Tv from the water temperature sensor 6, the signal of the key switch 8, and the signal of the automatic/manual changeover switch 20 are used to determine @machine status. On the other hand, when the signal from the neutral switch 21 is input to the neutral position determining means 22 and the gear shift position of the transmission is neutral, the warm-up state determining means 12 determines the engine coolant temperature TV and the set temperature Ts. If Tv<Ts, it is determined that the engine 1 is not turned on, and the automatic starting means 13 is activated based on the ON signal of the key switch 8. On the other hand, if it is determined that the engine coolant temperature Tw and the set temperature Ts are Tw≧TS and the @dawn state is established, the manual starting means 14 is activated. And engine coolant temperature TV and set temperature TS are Tw
(In the cold state of Ts, the automatic starting means 13 activates the glow plug driving means 15 by the ON signal of the key switch 8.
At the same time, the starter motor driving means 16 is put on standby by the timer 17. At this time, the switching means 14a of the manual starting means 14 makes the manual starting means 14 inoperative. Therefore, even if the engine key is turned further and the starter switch 9 is turned on, the on signal is transmitted to the starter motor drive means 1.
6 is not transmitted. The energized glow plug 4 is heated and its temperature rises, but at the same time as the energization begins, the timer 17 is set, and the timer timer 17 is set to a heating time that allows the glow plug 4 to sufficiently secure ignitability (for example, 3 .5 seconds), the glow plug drive means 15 is turned off by the time signal to stop energizing the glow plug 4, and the starter motor 5 is automatically started via the starter motor drive means 16. Start engine 1. When starting is completed, the starter motor 5 is automatically turned off, but the signal from the engine rotation speed sensor 11 is input to the engine speed determination means 19, and the engine speed nl is compared with the preset combustion speed n2. The output signal from the engine speed determining means 1g is input to the starter motor driving means 16. When the engine speed nl is higher than the complete explosion speed n2, the output from the starter motor drive means 16 is cut off, and the starter motor 5 is turned off. Also, a timer 18 is set at the same time as the starter motor 5 is started, and when the engine speed n1 does not reach the complete explosion speed n2 within the timer period (for example, 30 seconds), the timer 18 is set.
8, the switching means 14a of the manual starting means 14 is switched, the starter motor drive means 16 is turned off, and the driving of the starter motor 5 is stopped. Turn on switch 9 to start. On the other hand, the warm-up state determination means 12 determines that the engine coolant temperature T
w and the set temperature TS are compared, and when it is determined that the warm-up state is >TS, the output signal from the warm-up state determining means 12 is input to the manual starting means 14, and the switching means 14a is switched to switch the manual start state. The starting means 14 is activated. Then, based on the ON signal of the starter switch 9, the manual starting means 1
4. The starter motor 5 is activated via the starter motor drive means 16. When starting is completed, starter motor 5 is automatically turned off. In this case, since the engine 1 is warmed up, the fuel injected from the injector 3 can be successfully ignited without heating the glow plug 4. When the automatic/manual changeover switch 20 is set to manual, when a signal from the automatic/manual changeover switch 20 is input to the manual starting means 14, the switching means 14a of the manual starting means 14 is switched to switch the manual starting means 14. is activated. When the key switch 8 is turned on, this signal is input to the manual starting means 14, and the output signal from the manual starting hand F9.14 heats the glow plug 4 via the glow plug driving means 15, and the starter switch 9 By turning on the starter switch 9, the output signal of the manual starting means 14. The starter motor 5 is driven via the starter motor drive means 16 to start the engine 1. Next, the operation of the present invention will be explained with reference to the flowchart shown in FIG. First, manual start is selected using the automatic/manual changeover switch 20 (step 5100), key switch 8 is turned on (step 5102), automatic/manual changeover switch 2
The output signal of 0 is input to the manual starting means 14, and the switching means 14a of the manual starting means 14 is switched to the automatic/manual changeover switch 2.
An output signal of 0 sets the manual start state. The output signal from the manual starting means 14 heats the glow plug 4 via the glow plug driving means 15 (step 5103), and when the driver determines that the glow plug 4 has been sufficiently heated, it turns on the starter switch 9 (
step 3104), the manual starting means 14
．． The starter motor 5 is driven via the starter motor driving means 16 (step 5104), the engine 1 is started (step 5105), and when the starting is completed, the starter motor 5 is turned off (step 5106). Next, when automatic start is selected by the automatic/manual changeover switch 20 (step 5100), the output signal of the automatic/manual changeover switch 20 is input to the warm-up state determination means 12. On the other hand, the output signal from the neutral switch 21 is input to the neutral position determining means 22, and it is determined whether the gear shift position of the l-transmission is in the neutral position (step 3101), and the output signal of the neutral position determining means 22 is is input to the warm-up state determining means 12. Then, when the key switch 8 is turned on (step S1
07), the cooling water temperature Tw in the warm-up state determining means 12
and the set temperature Ts are compared (step 3108).
, and the cooling water temperature Tvt is lower than the set temperature Ts (T
w < Ts ), the output signal from the warm-up state determining means 12 is input to the glow plug driving means 15 via the automatic starting means 13, and the output signal of the glow plug driving means 15 causes the glow plug 4 to be activated by approximately 3. Turn on the power for 5 seconds to heat it (Step 5IQ9), and then turn on the automatic starting means 13.
The output signal from the starter motor drives the starter motor 5 via the starter motor drive means 16 (step 3110). On the other hand, the output signal from the engine rotation speed sensor 11 is input to the engine speed determination means 19 that determines whether the engine rotation speed n1 has reached the set completion speed n2,
The engine rotation speed n1 and the complete explosion speed n2 are compared and determined (step 5114), and the output signal of the engine speed determination means 19 is input to the starter motor drive means 16. If the engine rotational speed nl has reached the complete explosion speed n2, the output from the starter motor drive means 16 disappears, and the starter motor 5 is turned off (step 5115).
). On the other hand, if the engine speed n1 has not reached the complete explosion speed n2, the starter motor 5 continues to rotate, but if the operating time of the starter motor 5 exceeds the timer limit, for example 30 seconds, the starter motor 5 is turned off. (Step 51
17) Thereafter, when the automatic/manual changeover switch 20 is switched to manual based on the driver's judgment, the output signal of the automatic/manual changeover switch 20 is input to the manual starting means 14 and the switching means 14a of the manual starting means 14 is switched. and the manual starting means 14 is put into operation. And by manual operation,
First, in step 5118, the key switch 8 is turned off, and in step 5119, the key switch 8 is turned on again.
In step 5120, the glow plug 4 is heated to improve ignitability. Thereafter, the starter switch 9 is turned on in step 5121 to drive the starter motor 5, the starting is completed in step 5122, and the power to the starter motor 5 is turned off in step 5123. On the other hand, when the warm-up state determining means 12 determines that the warm-up state is such that the engine coolant temperature TVI and the set temperature Ts are Tw≧Ts (step 3108), the output signal of the warm-up state determining means 12 indicates that the manual starter 1 -114 to switch the switching means 14a of the manual starting means 14, and manual starting operation becomes possible. That is, when it is determined that the engine cooling water temperature Tw and the set temperature Ts are warmed up such that Tw≧Ts, the process moves to step 5111, and the output signal caused by turning on the starter switch 9 is sent to the starter motor drive means 16 via the manual starting means 14. The starter motor 5 is driven by the output signal of the starter motor drive means 16, and step 511
The engine 1 is started in Step 2, and when the starting is completed, the starter motor 5 is turned off in Step 5113. Therefore, although the engine 1 is started automatically, the driver can freely select the starting method by operating the automatic/manual changeover switch 2o. Furthermore, automatic starting is possible only when the transmission shift position is in neutral according to the output signal from the neutral switch 21, which prevents the risk of the vehicle running once the engine starts. It is possible to operate the starter switch 9 continuously from turning on the key switch 8 to turning on the starter switch 9, and there is no need to wait until the glow plug 4 is heated before operating the starter switch 9 as in the conventional case. The diesel engine 1 can be started with the same feeling as a gasoline engine. When the engine 1 is cold, after the glow plug 4 is sufficiently heated, the starter motor 5
Because the temperature of the glow plug 4 is low, the engine 1 does not start smoothly or has to be cranked for a long time, and the amount of exhaust smoke immediately after the engine 1 starts is reduced. will also decrease. In addition, it is determined whether heating of the glow plug 4 is necessary or unnecessary depending on the engine coolant temperature, and if it is not necessary, the glow plug 4 is heated.
Since heating is not performed, battery power is not wasted, and since the engine is switched to manual start when cranking for a long time, it is possible to prevent the battery from dying. [Effects of the Invention] As described above, according to the present invention, by providing an automatic/manual changeover switch, automatic starting and manual starting can be freely selected, and by providing a neutral switch, automatic starting can be performed. If you select , it is possible to prevent the risk of the vehicle running as soon as the engine starts, and it also determines whether glow plug heating is necessary or not based on the engine coolant temperature, and automatically operates the starter based on this determination result. In addition to deciding whether to start the engine manually, we also set a starter operating time to protect the battery when starting automatically, and switched to manual starting after the set time, so the engine can be operated in the same way as a gasoline engine. The engine can start easily, prevent the on-board battery from dying, and reduce the amount of exhaust smoke generated immediately after the engine starts.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is an overall configuration diagram of a diesel engine starting device, Figure 2 is a block diagram showing the configuration of a control unit, and Figure 3 is a block diagram showing the configuration of a control unit. is a flowchart diagram showing a starting operation. 1...Diesel engine, 4...Glow plug,
5...Starter motor, 6...Water temperature sensor, 8...
・Key switch, 9... Starter switch, 10...
- Control unit, 11... Engine speed sensor, 13... Automatic starting means, 14... Manual starting means, 14a... Switching means, 19... Engine speed determining means, 20... Automatic・Manual changeover switch, 21...
- Neutral switch, 22...Neutral position determination means. Patent applicant Fuji Heavy Industries Co., Ltd. Agent Patent attorney Jundo Kobashi Patent attorney Susumu Murai

Claims (1)

[Claims] In a vehicle in which a transmission is attached to a diesel engine equipped with a glow plug, an automatic/manual changeover switch as a means for starting control, a neutral switch for detecting the neutral position of the transmission, and a control unit are provided. and a neutral position determining means for determining the neutral position of the transmission based on a signal from the neutral switch; and a neutral position determining means for determining the neutral position of the transmission based on a signal from the neutral switch; Warm-up state determining means determines whether the glow plug heating is necessary or unnecessary based on the engine coolant temperature by determining whether the glow plug is in the neutral position, and automatically turns on the glow plug when the coolant temperature is low. An automatic starting means that heats the plug and starts the starter motor after a predetermined time to automatically start the engine, and a manual starter switch that does not heat the glow plug when the cooling water temperature is high. A starting device for a diesel engine, comprising manual starting means that starts the engine by starting the starter motor in response to a signal, and performs manual starting when the automatic/manual changeover switch is switched to manual.