JPS59138747A - Automatic starter of diesel engine - Google Patents

Abstract

PURPOSE:To provide simple starting-up operation and early warming-up process by providing an intake pipe or an exhaust pipe of a Diesel engine with a throttle valve and by inputting the throttle valve opening signal together with the various engine-operating-condition signals, and by correspondingly controlling preheating, fuel-injection, the throttle valve, etc. CONSTITUTION:The exhaust pipe 4 (or may be the intake pipe) of the Diesel engine 1 is provided with the throttle valve 4a and a microcomputer 7 is supplied with signals from a rotational speed sensor 12, water temperature sensor 11, the load-lever position sensor 15 of a fuel injection device 5, an exhaust-gas throttle valve opening sensor 16, etc. and controls an intake-air preheater 27, a fuel regulating valve 26, a fuel injection device 5, the throttle valve 4a, a starter 9, etc. When a starting switch 21 is put on and the cooling water temperature is below 10 deg.C, the preheater 27 is operated for a predetermined time to control the load-lever position, the exhaust-gas throttle valve is closed after the starter 9 is operated for a predetermined time, and the exhaust-gas throttle valve 4a is opened after the rotational speed reaches the predetermined range, by the self-running.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an automatic starting device for automatically starting a diesel engine. In particular, the present invention relates to a device for starting a diesel engine by closing the exhaust pipe or intake pipe of the diesel engine when starting the engine in a cold season.

[Description of prior art]

In general, diesel engines need to be started after heating the intake air of the engine during cold seasons, and in order to obtain normal engine output, a warm-up operation of about 3 to 5 minutes is required.

Conventionally, when starting a diesel engine, the driver manually operated each device in the engine to warm it up, but since this operation had to be performed while checking the status of each device, the driver Not only is the starting device cumbersome, since the starter cannot be removed, but time is wasted until the warm-up operation is completed.

For this reason, the applicant has simplified the starting operation and automatically controls the diesel engine from cranking to warm-up without having to restrain the driver until the engine warms up. An automatic starting device for a diesel engine that can be started has been filed in Japanese Patent Application No. 57-12402.

This automatic starting device takes in each detection signal of an engine temperature sensor and an engine rotation sensor as input information, and a preheating device that heats a heat plug provided in the intake air of the engine or a combustion chamber in accordance with each detection signal, The present invention is characterized in that each operation of a load lever adjustment device that moves the load lever position of the fuel injection device of the engine, I, and a scooter that starts the engine are automatically controlled over time.

The present inventor discovered that during the starting process of a diesel engine, especially during engine preheating, engine combustion occurs completely, which is the so-called "complete explosion".
In the meantime, if you narrow down the flow path of the engine's exhaust pipe or intake pipe,
The present invention was completed by focusing on the fact that combustion gas remains in the combustion chamber and the engine temperature rises, allowing the above-mentioned complete explosion to be reached quickly.

C. Purpose of the Invention] The present invention simplifies the starting operation and does not require the driver to be restrained until the warm-up of the engine is completed. It is an object of the present invention to provide an automatic starting device for a diesel engine that can perform automatic control and shorten the time required for warm-up operation.

[Features of the invention]

The present invention takes in each detection signal of an engine temperature sensor, an engine rotation sensor, a load lever position sensor of a fuel injection device, and an exhaust pipe or intake pipe aperture sensor number as input information, and responds accordingly to each detection signal. engine preheating device,
It is characterized by automatically controlling over time the various operations of a load lever adjustment device that moves the load lever position of the engine's fuel injection device, an actuator that adjusts the degree of restriction of the exhaust pipe or intake pipe, and a starter that starts the engine. do.

[Explanation based on examples]

An explanation will be given below based on the drawings of the embodiment.

FIG. 1 is a block diagram of an automatic starting device according to an embodiment of the present invention.

In FIG. 1, 1 is a diesel engine of a vehicle, 2 is a transmission, 3 is a parking brake, and 4 is an exhaust pipe. A step motor 7 for moving the position of the load lever 6 is connected to the load lever 6 of the fuel injection device 5 of the diesel engine 1. Further, a starter 9 is disposed at the rear end of the crankshaft of the diesel engine 1. Furthermore, in the exhaust pipe 4,
A solenoid 10 is provided to open and close the exhaust valve 4a.

Further, reference numeral 11 is a water temperature sensor, which detects the cooling water temperature of the diesel engine 1 as an electric signal. Reference numeral 12 is a rotation sensor that detects the rotation speed of the diesel engine 1 as an electrical signal. Further, 13 is a neutral sensor, which sends out an electric signal when the transmission 2 is in the neutral position. Further, 14 is a parking sensor, which sends out an electric signal when the parking brake 3 is operating. Further, reference numeral 15 is a load lever position sensor, which detects the position of the load lever 6 as an electric signal. Furthermore, 1G is an exhaust pipe restricting degree sensor, which detects the restricting degree of the exhaust opening/closing valve 4a as an electric signal.

The detection outputs of these sensors 11 to 16 are connected to the CPU 19 via the input interface 18 of the microcomputer 17 of the vehicle in which the diesel engine 1 is mounted. A memory device 20 is connected to this CPU 19, and this memory device 2o stores information about the optimal fuel supply amount according to the value of the cooling water temperature of the diesel engine 1, that is, the position of the load lever 6, the operating time of the starter 9, and the opening/closing of the exhaust gas. The degree of aperture of the valve 4a, etc. are stored.

Also connected to the CPU 19 are a start switch 21 for starting the CPU 19 and a display lamp 22 for indicating the end of the warm-up operation of the diesel engine 1.

The starting switch 21 and indicator lamp 22 are incorporated into the dash board at the driver's seat. The CPU 19 is connected to the III control input of the switch circuit 25 via the output interface 23. The output of this switch circuit 25 is connected to the step motor 7, scooter 9, solenoid 10, fuel flow control valve 26, and preheater 27, respectively. 28 is an intake manifold, and 29 is a battery.

With such a configuration, the operation of the apparatus of this embodiment will be explained based on the flowchart of FIG. 2. First, the transmission 2 is placed in a neutral state and the parking brake 3 is activated. Next, when the start switch 21 is turned on, the CPU 19 moves the position of the load lever 6 using the step motor 7 if the cooling water temperature is 10° C. or higher based on the detection output of the water temperature sensor 11, and at the same time moves the position of the load lever 6 to the fuel flow control valve 26.
is opened, and then the scooter 9 is operated for 5 seconds to crank the diesel engine I.

Further, if the cooling water temperature is less than 10° C. from the detection output of the water temperature sensor 11, the CI) UI 9 operates the preheating heater 27 for only 10 seconds, and moves the position of the load lever 6 by the step motor 7 according to the cooling water temperature. At the same time, the fuel flow control valve 26 is opened, and then the starter 9 is operated for 5 seconds to crank the diesel engine 1. Simultaneously with the activation of the starter 9, the CPU 19 activates the solenoid 10 to close the exhaust valve 4a.

Here, the diesel engine 1 undergoes the first ignition after cranking, the "initial explosion," and is then in a state of self-rotation, the so-called "initial explosion."
If the CP419 does not reach the "repeat explosion" condition, the starting switch will start.
The operation immediately after the notch 21 is inserted is repeated again. At this time, if the cooling water temperature is less than 10°C, the exhaust opening/closing valve 4a remains closed. If the diesel engine 1 deviates from its self-rotation rotation, the CPU 19 assumes that it is in a "repeat explosion" state and checks whether the rotation speed n is suitable for warm-up operation using the rotation sensor 12 based on the following formula. .

500Crpm)≦n≦800 (rpm)
-------■ If the rotational speed n is outside the range of the 0 formula, the CPU 19 drives the stenopmoke 7 and adjusts the position of the load lever 6 so as to satisfy the 0 formula. If it is determined that the rotational speed n satisfies the formula 0 and the cooling water temperature is less than 40°C, the warm-up operation is continued. If warm-up continues and the cooling water temperature exceeds 40°C and the rotational speed n exceeds the upper limit of the formula (800 (rpm)), the diesel engine 1 will shift to "complete explosion" with complete combustion at CPUt9. It is determined that the condition has been reached. At this time, if the exhaust opening/closing valve 4a is in the closed state, the CPU 19 operates the solenoid NO to υ1.
The air on/off valve 4a is opened and the display lamp 22 is turned on to notify that the warm-up operation has been completed. Further Cl) tJ
, 19 closes the fuel flow control valve 26 to stop the diesel engine 1 five minutes after the indicator lamp 22 lights up.

When the exhaust valve 4a is closed due to the operation of the solenoid 10, combustion gas remains in the combustion chamber, increasing the temperature within the combustion chamber, and the back pressure of the exhaust gas in the exhaust pipe 4 acts synergistically to This further increases the end-of-compression temperature in the combustion chamber of the engine, significantly promoting the ignition effect. Therefore, the "repeat bombing" time is shortened compared to the conventional method.

The operating time of the exhaust opening/closing valve 4a by the solenoid 10 is shown in the rotation characteristic diagram of the diesel engine 1 in FIG. In Fig. 3, the vertical axis represents the rotational speed of the diesel engine 1;
The horizontal axis is time. to is the startup time of Scooter 9,
Time T1 at time to = tl is cranking time,
t2 is the first detonation time, time T2 from time t2 to t3 is the continuous detonation time, and time t4 is the complete detonation time. The operating time of the exhaust opening/closing valve 4a by the solenoid 10 is a time T3 from time to to time t5 when the rotational speed exceeds 800 [:rpm].

In the above example, the throttle sensor and the solenoid are installed in the exhaust pipe, but in order to prevent the air in the combustion chamber from being cooled by the swirling flow of intake air, it is necessary to install the throttle sensor and the solenoid in the intake pipe. Even if it is provided, the present invention can be implemented in the same way. Further, the aperture sensor and the solenoid may be provided in both the exhaust pipe and the intake pipe.

Further, the numerical values shown in the above example are merely examples, and do not limit the scope of the present invention, and other numerical values can be set depending on the performance of the engine.

Furthermore, although an example has been shown in which the driver turns on the starting switch manually, a widely known timer may be used to automatically turn on the starting switch at a desired time.

Further, although a water temperature sensor is used as a means for detecting the temperature of the engine, the present invention is not limited to this, and a sensor that detects the temperature of the lubricating oil of the cylinder or the exhaust gas as an electric signal may be used.

Further, although the activation condition for the device of the present invention is set to be such that the parking brake is activated, the device of the present invention may be configured to activate regardless of whether or not the parking brake is activated.

〔Effect of the invention〕

As described above, according to the present invention, 1. an actuator is provided that can throttle the exhaust pipe or intake pipe during cold seasons, and in addition to the conventional information necessary for starting the engine, By capturing information on the degree of restriction as an electrical signal and automatically setting and controlling the two actuators in addition to each starting aid device to the optimal starting conditions, starting the diesel engine becomes extremely easy.
The driver can be relieved until the warm-up operation is completed.

In particular, by adding a blockage condition to the exhaust pipe or intake pipe to the starting conditions in cold weather, the ignition effect can be further increased and "repeat explosion" can be achieved.
It has the excellent effect of shortening the time required for warm-up operation.

Furthermore, if the start switch of the apparatus of the present invention is turned on by a timer, there is an advantage that the burden on the driver can be reduced when the engine is operated early in the morning or late at night.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an automatic device according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation. FIG. 3 is a rotational characteristic diagram of the diesel engine of this embodiment. 1...Diesel engine, 2...Transmission, 3...Parking brake, 4...Exhaust pipe, 4a...Exhaust opening/closing valve,
5...Fuel injection device, 6...Load lever, 7...
・Step motor, 9... Starter, 10... Solenoid, 11... Water temperature sensor, 12... Rotation sensor, 13... Neutral sensor, 14... Parking sensor, 15... Load lever Position sensor, 16.
...Exhaust pipe aperture sensor, 17...Microcomputer, 1B...Input interface, 19...CP
U, 20...Memory device, 21...Start switch,
22... Display lamp, 23... Output interface 1.25... Sui-nochi circuit, 26... Fuel flow rate control valve, 27... Preheater, 28... Intake manifold, 2... ··Battery. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Nao Takashi Idetot1t2t3t5t4P Figure 3

Claims (4)

[Claims] (1) A temperature sensor that detects the temperature of the diesel engine as an electrical signal; a rotation sensor that detects the rotational speed of the engine as an electrical signal; and a rotation sensor that detects the load position of the fuel injection device of the engine as an electrical signal. a load lever position sensor; a preheating device for the engine; a load lever adjustment device for moving the load lever position; a starter for starting the engine; each of the temperature sensor, rotation sensor, and load lever position sensor. A control device that takes in detection signals as input information and outputs control signals for each operation of the pre-i% device, the load lever adjustment device, and the scooter in accordance with each detection signal, and a start switch that starts this control device. An automatic starting device for a diesel engine, comprising: an exhaust pipe restriction sensor that detects the restriction degree of the exhaust pipe of the engine as an electrical signal; and an exhaust pipe opening/closing actuator that adjusts the restriction degree of the exhaust pipe; The control device causes the preheating device to heat the engine based on the temperature detected by the temperature sensor, and moves the load lever position by the load lever adjustment device based on the detection output of the load lever position sensor, and then The engine is started by the starter, and at the same time, when the temperature detected by the temperature sensor is low, the exhaust pipe is closed by the exhaust pipe closing actuator, and the exhaust pipe opening/closing actuator is operated until the rotation sensor outputs a predetermined rotation speed. An automatic starting device for a diesel engine, characterized in that it is configured to maintain the exhaust pipe in a closed state. (2) The automatic starting device for a diesel engine according to claim (1), wherein the starting switch is configured to operate at a predetermined time by a timer. (3) A temperature sensor that detects the temperature of the diesel engine as an electrical signal, a rotation sensor that detects the rotational speed of the engine as an electrical signal, and a load lever that detects the position of the load lever of the fuel injection device of the engine as an electrical signal. a position sensor, a preheating device for the engine, a load lever adjustment device for moving the load lever position, a starter for starting the engine, and each detection signal of the temperature sensor, the rotation sensor, and the load lever position sensor. a control device that takes in as input information and outputs control signals for each operation of the preheating device, the load lever adjustment device, and the starter in accordance with each detection signal, and a start switch that starts this control device. An automatic starting device for a diesel engine, comprising: an intake pipe restriction sensor that detects the restriction degree of the intake pipe of the engine as an electric signal; and an intake pipe opening/closing actuator that adjusts the restriction degree of the intake pipe; The preheating device heats the intake air of the engine based on the temperature detected by the temperature sensor, the load lever adjusting device moves the rotor lever position based on the detected output of the load lever position sensor, and then the rotor lever position is moved by the load lever adjusting device based on the detected output of the load lever position sensor. When the engine is started by the scooter and at the same time the temperature detected by the temperature sensor is low, the intake pipe is closed by the intake pipe opening/closing actuator, and the intake pipe opening/closing actuator is operated until the rotation sensor outputs a predetermined rotation speed. An automatic starting device for a diesel engine, characterized in that it is configured to maintain the intake pipe in a closed state. (4) The automatic starting device for a diesel engine according to claim (3), wherein the starting switch is configured to operate at a predetermined time by a timer.