JP2000257540A - Engine start control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a starter switch signal by judging start by an input of a sensor signal, and judging completion of start when engine rotating speed is start judging rotating speed or more. SOLUTION: In the case where an engine is started, it is judged whether rotation of an engine is started or not by whether a signal of a crank angle detecting sensor 43 is inputted or not. When rotation of the engine is started, start is judged, and engine rotating speed is calculated on the basis of a signal of the crank angle detecting sensor 43. It is judged whether engine rotating speed is start judging rotating speed or more or not. When it is not the start judging rotating speed or more, starting is judged, a predetermined fuel quantity is injected. When it exceeds the start judging rotating speed, completion of start is judged. After engine is started, control is advanced, and a fuel quantity is injected on the basis of engine rotating speed and an engine load. By eliminating a starter switch signal, costs are reduced, and an operation control device is downsized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of engine start control.

[0002]

2. Description of the Related Art Conventionally, in an engine of a type in which fuel is injected into an intake pipe, a fuel injection amount is set to a target A / F based on an engine speed and an engine load. At the time of starting, that is, at the time of cranking, it is necessary to enrich the A / F unlike the state after the starting. For this purpose, a starter switch signal for driving a starter motor is input to an ECU (engine control unit), and the starter switch signal is input. In this case, it is determined that cranking is being performed, and a predetermined amount of fuel is supplied.

[0003]

By the way, signal lines from a large number of sensors are usually connected to the ECU via connectors. This connector has a predetermined number of pins (for example, 24 pins).
Pins, 32 pins), but if there is even one signal line, a connector may have to be added,
There is a problem that the cost increases and the ECU becomes large. In particular, in a fuel injection type engine, the number of sensors is increased, so that this problem is important to be solved. Further, when the engine is mounted on an outboard motor, a space restriction is added. Further, when a manual starter is used as in an outboard motor, there is a problem that A / F control cannot be performed because there is no starter switch signal.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides an engine start control device that can reduce the cost and reduce the size of the ECU by eliminating the need for a starter switch signal. The purpose is to:

[0005]

According to a first aspect of the present invention, there is provided an engine for controlling fuel injection at the time of starting, comprising a crank angle detection sensor, and receiving a signal from the sensor. Is determined to have started,
The invention according to claim 2, wherein a predetermined amount of fuel is injected, and when the engine rotation speed reaches or exceeds the startup determination rotation speed, it is determined that the engine has been started. The invention according to claim 3 is characterized in that the engine is started by a manual starter.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an example of an outboard motor to which the present invention is applied. FIG. 1 is a configuration diagram of a control system, FIG. 2 is a side view of the engine of FIG. 1, and FIG. 3 is a plan view of FIG. is there. In the drawings, the same components are denoted by the same reference numerals, and description thereof may be omitted.

In FIG. 1, an outboard motor 1 is supported by a stern 2a of a hull 2 via a clamp bracket 3 and the like so as to be able to swing up and down, left and right. The outboard motor 1 has a structure in which an engine 6 is mounted on a lower case 5 in which a propulsion device 4 is disposed. The propulsion device 4 has a propulsion shaft 11 at a lower end of a vertically extending drive shaft 8 via a bevel gear mechanism 10.
And a propeller 12 is connected to the rear end of the propulsion shaft 11. The bevel gear mechanism 10 includes a drive bevel gear 10 a mounted on a drive shaft 8 and a propulsion shaft 1.
1 comprises a forward bevel gear 10b and a reverse bevel gear 10c which are rotatably mounted on and meshed with a drive bevel gear 10a.

The hull 2 is provided with a driving operation device 15. This driving operation device 15 connects a shift rod 18b via a shift cable 18a to an operation lever 16 pivotally supported so as to be able to swing back and forth.
Any one of the front and rear bevel gears 10b and 10c is connected to the propulsion shaft 11 by a dog clutch 18c connected to the propulsion shaft 8b.
Or, they are configured not to be combined.

The engine 6 is a water-cooled, four-cycle, four-cylinder engine, in which a crankshaft 20 is arranged vertically so as to be substantially vertical during running. The upper end of the shaft 8 is connected. The engine 6 has a piston 22 inserted and arranged in a cylinder 21 a formed in a cylinder body 21, and the piston 22 is connected to a crankshaft 20 by a connecting rod 23.
It is of a structure connected to. A cylinder head 24 is fastened to a rear facing surface of the cylinder block 21 as viewed in the longitudinal direction of the hull.

A spark plug 25 is mounted in a combustion chamber 24a formed in the cylinder 21a and the cylinder head 24. Further, an exhaust valve 28 and an intake valve 29 are disposed at an exhaust port 26 and an intake port 27 communicating with each combustion chamber 24a, respectively.
29 is a camshaft 30 arranged in parallel with the crankshaft 20,
31 is driven to open and close. In addition, 25a is an ignition coil, 25b is an igniter. An exhaust manifold 32 is connected to the exhaust port 26, and exhaust gas is discharged from the rear end of the propulsion device 4 from the exhaust manifold 32 through the lower case 5.

An intake pipe 33 is connected to each intake port 27, and a throttle valve 17 is disposed in the intake pipe 33. The intake pipe 33 is provided with a bypass passage 61 that connects the upstream side and the downstream side of the throttle valve 17.
An idle intake air amount adjusting valve 62 is provided in the bypass passage 61. Further, a fuel injection valve 40 is inserted and arranged at a portion desired for each intake port 27 of the cylinder head 24, and an injection port of the fuel injection valve 40 is directed toward an opening of the intake port 27. Reference numeral 52 is a throttle opening sensor.

A fuel tank 63 installed on the hull 2 side
The fuel inside the second low-pressure fuel pump 6 is passed through a filter 65 on the outboard motor side by a manually operated first low-pressure fuel pump 64.
Sent to 6. The second low-pressure fuel pump 66 is a diaphragm pump driven by the camshaft 30,
Vapor separator tank 6 as a gas-liquid separator
Send to 7. In the vapor separator tank 67, a high-pressure fuel pump 69 driven by an electric motor 68 is provided.
After passing through 0, it is sent to the fuel injection valve 40. The fuel injection valve 40 is connected to a pressure regulating valve 72 via a return pipe 71, and surplus fuel exceeding a set pressure is returned to a vapor separator tank 67.

The engine 6 has an ECU as an operation control device.
(Engine control unit) 42.
The ECU 42 includes a crank angle (engine speed) detection sensor 43, an intake pressure sensor 44, a throttle opening sensor 5
2. Detection values from the engine temperature sensor 46, the hull speed sensor 47, and the cylinder discrimination sensor 48 are input, and based on these detection values, based on an operation control map stored in advance,
The fuel injection amount of the fuel injection valve 40, the injection timing, the ignition timing of the ignition plug 25, the opening degree of the idle intake air amount adjustment valve 62, and the electric motor 68 of the high pressure fuel pump 69 are controlled. In addition, the driving operation device 15 includes:
A starter switch 58 is provided, and the starter switch 5 is provided.
8 is transmitted to the starter motor 60 via the drive circuit 59.
It is connected to the. Note that the starter motor 60 is not essential, and a method of manually driving the motor by a manual starter may be employed, or a method including both methods may be employed.

Further, a shift position sensor 55 is provided on the shift rod 18b of the driving operation device 15. The shift position sensor 55 detects the position of the shift rod 18b, that is, the shift position of the operation lever (forward,
(A neutral position, a reverse position) and outputs a voltage value proportional to the shift position to the control unit 42. The operation lever 16 is provided with a lever speed sensor 57 for detecting the rotation speed. The detection value from the sensor is output to the ECU 42.

2 and 3, the engine 6 is covered with a cowling 7 and a drive pulley 13 and a flywheel 14 are fixed above the crankshaft 20.
Driven pulleys 19a, 19b are fixed to the camshafts 30, 31, and the rotation of the drive pulley 13 is transmitted to the driven pulleys 19a, 19b by a belt. The engine 6 has four cylinders # 1 to # 4 arranged in the vertical direction. An intake pipe 33 is connected to each of the cylinders # 1 to # 4, and the cylinders are arranged in front of the engine via a throttle body 36. Connected to the silencer 35. # 1 and # 2 intake pipe 3
The intake pipes 3 and # 3 and # 4 are respectively merged and connected to the respective throttle bodies 36.

A single common valve shaft 37 is vertically penetrated through each throttle body 36, and the valve shaft 37 is provided with the throttle valve 17 shown in FIG.
The throttle opening sensor 52 is provided at the upper end of the throttle valve. A rod 38 and a lever 39 are provided at an intermediate portion of the valve shaft 37.
The throttle wire 41 is connected via a and 39b. Further, an idle intake air amount adjusting valve 62 is provided inside the intake pipe 33 of the uppermost cylinder # 1, and two rubber hoses 61a, 61 constituting the bypass passage 61 of FIG.
b is connected to the junction of each intake pipe 33.

A starter motor 60 and a vapor separator tank 67 are provided on the side surface of the cylinder body 21, and a fuel supply rail 43 is provided on the cylinder head 24 in a vertical direction. The fuel injection valves 40 for the cylinders # 1 to # 4 are mounted, and a second low-pressure fuel pump 66 driven by the cam shaft 31 is mounted on the rear surface of the cylinder head 24.

FIG. 4 is a diagram showing an embodiment of a start control device according to the present invention and showing a flow of processing. First, step S
At 1, it is determined whether or not the rotation of the engine has started based on whether or not the signal of the crank angle detection sensor 43 has been input. If the rotation of the engine has started, it is determined that the engine has started in step S2, and the engine speed is calculated based on the signal of the crank angle detection sensor 43 in step S3. In step S4, it is determined whether or not the engine speed is equal to or more than the start determination speed. If not, it is determined in step S5 that the engine is being started, a predetermined amount of fuel is injected, and the process returns to step S3. Step S
At 6, it is determined that the start is completed. Then, the control proceeds to the control after the engine is started, and the fuel amount is injected based on the engine speed and the engine load.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, 4
An example in which the invention is applied to a cycle fuel injection type outboard engine is described. However, the invention may be applied to a two-cycle engine, or may be applied to a carburetor system having an A / F control function at start-up. Of course, the present invention may be applied to a vehicle engine.

[0020]

As is apparent from the above description, according to the first aspect of the present invention, by eliminating the need for a starter switch signal, the cost can be reduced and the ECU can be downsized. According to the second aspect of the present invention, it is possible to effectively employ the outboard motor with limited space, and according to the third aspect of the present invention, even in a manual starter type outboard motor, A / at start
F control becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control system showing an example of an outboard motor to which the present invention is applied.

FIG. 2 is a side view of the engine of FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a diagram showing an embodiment of a start control device of the present invention and showing a flow of processing.

[Explanation of symbols]

 6 ... Engine 33 ... Intake pipe 40 ... Fuel injection valve 43 ... Crank angle detection sensor

Claims (3)

[Claims] An engine for performing fuel injection control at the time of starting is provided with a crank angle detection sensor. When a signal from the sensor is input, it is determined that starting is started, a predetermined amount of fuel is injected, and an engine speed is detected. A start control unit that determines that the engine has been started when the engine speed reaches or exceeds a start determination rotation speed. 2. The start control device according to claim 1, wherein said engine is an engine for an outboard motor. 3. The start control device according to claim 2, wherein the engine is started by a manual starter.