JPS6319690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting control device for an internal combustion engine equipped with an exhaust gas recirculation device, the purpose of which is to improve starting at low temperatures.

It is well known that introducing warm air when starting at a low temperature is effective for starting internal combustion engines equipped with an exhaust gas recirculation device that reflows part of the exhaust gas into the intake side, but this alone is not enough to start the engine. is not obtained. This is because the fuel injection timing is not properly obtained.

In other words, when starting at a low temperature, it is desirable to keep the on-off valve of the exhaust recirculation system mid-open and advance the fuel injection timing.By fully opening the on-off valve as the engine warms up and delaying the fuel injection timing, white smoke and This is a measure to reduce odor.

The present invention solves the conventional problems by electronically controlling an exhaust gas recirculation device and an automatic fuel injection timing adjustment device in a connected manner.

Embodiments of the present invention will be described below based on the drawings.
1 is an engine, 2 is an intake pipe, 3 is an exhaust pipe, 4 is an exhaust gas recirculation pipe for sending part of the exhaust gas to the intake side, and 5 is an on-off valve. Reference numeral 6 indicates a fuel injection pump, and 7 indicates an automatic fuel injection timing adjustment device (hereinafter referred to as an automatic timer).The present invention provides an operating device for controlling the automatic timer 7 to slow down or advance by an external force. This actuating device is, for example, a hydraulic cylinder 8 as shown in the figure, and the left and right movement of its piston is controlled by an automatic timer 7 using a lever.
Control slow and fast. This hydraulic cylinder 8 has its left and right chambers connected to a hydraulic pump 9 through a pipe line, and each pipe line is provided with control valves 10a and 10b. Furthermore, the hydraulic pump 9 is connected to the on-off valve 5 of the exhaust gas recirculation system via a conduit via a control valve 13, so that the on-off valve 5 can be opened and closed by hydraulic operation.

Reference numeral 11 denotes an electronic control device, into which elements 12 such as the rotational speed, temperature, load, etc. of the engine 1 are input, and the control valves 10a, 10b, 13 are controlled to open and close based on appropriately calculated control output signals.

The operation of the present invention having the above configuration is as follows:
When starting at a low temperature, the control valve 13 is opened by a control output signal from the electronic control device 11. The opening degree of the control valve 13 is such that the opening/closing valve 5 of the exhaust gas recirculation device is set to a medium throttle opening degree to suppress the flow in the exhaust gas recirculation circuit, and the hydraulic cylinder 8 is configured to advance the automatic timer 7. Control valve 10a is opened. This allows air to be introduced and appropriate fuel injection timing, allowing for effective starting at low temperatures, and preventing the emission of white smoke after ignition and self-rotation. When the engine 1 enters warm-up operation, the electronic control unit 11 controls the control valve 13 to fully open the on-off valve 5, and the hydraulic cylinder 8 closes one control valve 10a so as to delay the automatic timer 7. Then, the other control valve 10b is opened. As a result, the exhaust gas is recirculated at the full regular amount, and the fuel injection timing is set at an appropriate timing to match this, thereby reducing the odor of the exhaust gas.

As described above, the present invention appropriately controls the amount of exhaust gas recirculation and the fuel injection timing by an electronic control device using an exhaust gas recirculation device and an automatic timer, that is, an automatic fuel injection timing adjustment device, depending on the engine condition. Therefore, there are advantages in that startability is improved, especially at low temperatures, and white smoke and odor are effectively reduced.

[Brief explanation of the drawing]

The drawing is a schematic configuration diagram showing the apparatus of the present invention. 1...Engine, 2...Intake pipe, 3...Exhaust pipe, 4...Exhaust gas recirculation pipe, 5...Opening/closing valve,
6... Fuel injection pump, 7... Fuel injection timing automatic adjustment device (automatic timer), 8... Hydraulic cylinder,
9... Hydraulic pump, 10a, 10b... Control valve, 11... Electronic control device, 12... Input element, 13... Control valve.

Claims (1)

[Claims] 1. In an internal combustion engine equipped with an exhaust gas recirculation device and an automatic fuel injection timing adjustment device for a fuel injection pump, an actuation device for slowing or advancing the automatic fuel injection timing adjustment device, and this activation device and the exhaust gas recirculation device. The exhaust gas recirculation device is equipped with an electronic control device for controlling an on-off valve, and is configured to reduce the opening degree of the on-off valve and advance an automatic fuel injection timing adjustment device at the time of cold start. Start control device for internal combustion engine.