JPH0125709Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an output control mechanism for a deactivated engine for an automobile that changes the number of operating cylinders of the engine depending on the driving condition of the automobile.

Generally, by stopping the operation of some cylinders in a multi-cylinder internal engine and increasing the combustion efficiency of the remaining cylinders, it is possible to improve fuel efficiency and reduce the amount of harmful unburned gas emissions. Are known.

In addition, as methods for stopping the operation of some of the cylinders mentioned above, there are methods such as stopping fuel supply to some cylinders, stopping valve operation of some cylinders in a closed state, etc. As disclosed in Japanese Patent Application Laid-open No. 115408/1983, the cylinder valve operation stop mechanism is a valve operating mechanism that drives intake and exhaust valves via a link mechanism based on the rotation of a camshaft linked to engine rotation. Those with a structure in which a deactivation mechanism is interposed in a part of the link mechanism, and furthermore, as shown in Figs. 1 to 3, valves that drive poppet valves 1 used in engine intake valves, exhaust valves, etc. A part of the system, for example, includes a cylinder 3 fitted to the rocker arm 2, a stopper 5 into which the plunger 4 is slidably fitted, a stopper 5 that engages and disengages from the plunger 4, and an actuator 6 that drives the stopper 5. is engaged with the engagement groove 7 of the plunger 4, and the plunger 4
The poppet valve 1 is actuated by stopping the sliding movement of the poppet valve 1, and the poppet valve 1 is actuated by disengaging the stopper 5 from the plunger 4 and causing the plunger 4 to slide within the cylinder 3 against the spring 8. Some devices are configured to stop the operation of the device.

In addition, in FIGS. 1 to 3, the actuator 6 is provided on the rocker arm 2, and includes a hydraulic cylinder 9, a hydraulic piston 10, a stopper 5, and a piston 1.
0, and the timing of the actuation of the actuator 6 is determined by a timing mechanism 12.
controlled by

The timing mechanism 12 includes a timing cam 14 provided on a rocker shaft 13, a timing cam follower 15 that slides in contact with the timing cam 14, and a piston that swings around a shaft 16 in response to the sliding of the follower 15. Notch 1 provided in 10
Timing plate 18 that engages and disengages from 7.
The timing plate 18 has a spring 19 biased in the direction of engagement with the notch 17.

By the way, in the above-mentioned valve operation stop mechanism, after detecting the operating state of the automobile, an electric control means issues a valve stop release signal to activate the valve operation stop mechanism, changing the state from a cylinder-inactive state to an all-cylinder operation state. In particular, in order to improve idling fuel efficiency, cylinders are deactivated at idle, and if the cylinders are deactivated at the time of starting, problems such as engine stalling or shock may occur due to insufficient output. When switching to cylinder operation, even if you immediately instruct all cylinders to operate after detecting that the accelerator pedal or throttle valve has left the idle position, due to the delay described above, the clutch will be connected before all cylinders operate, causing the shock to shut down. There is a high risk of engine failure or engine stalling.

The present invention has been proposed in view of the above, and the output control mechanism of the deactivated engine for automobiles according to the present invention stops the intake and exhaust valves provided in some cylinders of a multi-cylinder engine in a closed state. A valve operation stop mechanism that deactivates some of the cylinders; a first control means that activates the valve operation stop mechanism to deactivate some cylinders in a predetermined low speed and low load operating state including an idling state; a second control means for detecting a start and canceling the partial cylinder deactivation caused by the first control means; and a damper for reducing the operating speed in the connection direction of the clutch mechanism for intermittent output transmission to the drive system of the engine. It is characterized by comprising:

Next, one embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5.

The four-cylinder automobile engine 20 has cylinders 21 and 2.
Inner two cylinders 222, 23 among 2, 23, 24
has a valve operation stop mechanism 25 as shown in FIGS. 1 to 3 above, and the valve operation stop mechanism 25 is controlled by hydraulic pressure (not shown). It is done.

Power supply control to the solenoid valve 26 is performed by an electronic control circuit 27, and the circuit 27 includes a first control circuit 28 for determining cylinder deactivation and a second control circuit for canceling the cylinder deactivation signal by the control circuit 28. A circuit 29 is provided.

The first control circuit 28 receives a signal from an operating state detector 30 that detects the rotational speed of the engine 20, the accelerator opening, and the temperature of the engine coolant, and indicates that the engine coolant temperature is higher than a predetermined value. The AND gate 31 outputs a high-level cylinder deactivation signal _S1 in a predetermined low-load operating state including an idle state.
Output to.

A signal from a start detector 32 that detects when an accelerator pedal or throttle valve (not shown) has left the idle position is input to the second control circuit 29, and normally a high level signal is input from the second control circuit 29. The signal S ₂ is output, and the signal S ₁ is directly input to the solenoid valve 26 via the AND gate 31, the solenoid valve 26 is energized, the valve operation stop mechanism 25 is activated to deactivate the cylinder, and the start detector 32 is activated. When the start of the automobile is detected, the second control circuit 29
The output from the AND gate 31 changes to low level, and the output signal from the AND gate 31 to the solenoid valve 26 also changes to low level, switching to all-cylinder operation.

Incidentally, when the manual transmission is in an idle state, the output of the engine 20 is cut off by the clutch 33, and at this time the clutch pedal 34 is depressed.

The clutch pedal 34 is connected to one end of a release lever 36 via a cable 35, and the release lever 36 rotates around a fork shaft 37. A mating clutch release fork 40 is provided.

Also, the fork shaft 37 has a spring 4.
One end of the spring 41 is attached to the clutch casing 42 and the other end is attached to the end of the clutch release fork 40. is energized.

By the way, in this embodiment, when the release lever 36 is rotated counterclockwise in FIG. A rod 44 of 43 is in contact with the release lever 36.

According to the above configuration, when the valve operation stop mechanism 25 is activated and the accelerator pedal is depressed to start from idling operation where the cylinder is in a deactivated state, the start detector 3
2, the electronic control circuit 27 de-energizes the solenoid valve 26, and the cylinder deactivation operation of the valve operation stop mechanism 25 is released to shift to full cylinder operation, and then the clutch 33 is activated by returning the clutch pedal 34. Since the connection of the clutch 33 is achieved with a slight delay by the damper 43, a shock or engine stall due to a decrease in output when the clutch 33 is connected is caused by the engine 20
This is prevented by operating all cylinders, resulting in a smooth start.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a valve operation stop mechanism used in the present invention, Fig. 2 is a sectional view taken along the - arrow in Fig. 1, Fig. 3 is a sectional view taken in the - arrow direction in Fig. 1, and Fig. 4 is a sectional view taken in the - arrow direction in Fig. 1. 5 is a schematic diagram showing an embodiment of the present invention, and FIG. 5 is an explanatory diagram of the main part of the embodiment. 20: Engine, 21, 22, 23, 24: Cylinder, 25: Valve operation stop mechanism, 26: Solenoid valve, 27: Electronic control device, 28: First control circuit, 29: Second control circuit, 30: Operating state detector, 31: AND gate, 32: Start detector, 3
3: Clutch, 43: Damper.

Claims (1)

[Scope of utility model registration request] A valve operation stop mechanism that shuts down intake and exhaust valves installed in some cylinders of a multi-cylinder engine in a closed state to deactivate some of the cylinders; a first control means for activating a stop mechanism to partially deactivate the cylinders; a second control means for detecting the start of the automobile and canceling the partial cylinder deactivation caused by the first control means; An output control mechanism for a deactivated engine for an automobile, comprising a damper that reduces the operating speed in the connection direction of a clutch mechanism that interrupts and disconnects output transmission to a drive system.