JPS624008Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle equipped with a cooling device in which a compressor of a cooling device such as an air conditioner or a car cooler is driven by the power of an engine equipped with a fuel cut mechanism.

Recently, in this type of vehicle, it has become possible to increase the idling speed of the engine by slightly shifting the closed position of the throttle valve of the carburetor to the open side only when the air conditioner or car cooler is running. Some vehicles are equipped with a so-called idle-up mechanism, but many vehicles do not have such a mechanism. Furthermore, in response to the requests of users who dislike high noise during idling, systems have been developed in which the operation of the idle up mechanism can be stopped by operating a switch or the like. However, in vehicles that do not have such an idle-up function or that can be temporarily disabled, the idling rotational speed may be considerably higher than the set rotational speed when the cooling device is not operating, depending on the load for driving the cooling device. Since the engine speed decreases, there is an inconvenience that engine stall is likely to occur. This inconvenience is particularly noticeable in vehicles in which the fuel supply is cut off during deceleration for the purpose of improving fuel efficiency or the like. In other words, if the fuel supply from the slow system passage is cut off and deceleration by engine braking continues, all the fuel will be sucked out into the combustion chamber, causing the inside of the slow port and intake manifold to become dry, causing the engine to misfire. state. Therefore, if you depress the clutch pedal to change gears or stop the vehicle in such a state, the rotational biasing force that was being transmitted from the wheels to the engine will be suddenly cut off, and there is a risk that the engine will stop. If the load from the cooling system is placed on the engine at this time, this tendency will be further exacerbated, and the probability that the engine will actually stall becomes extremely high.

The present invention has been developed in view of these circumstances, and eliminates the above-mentioned inconvenience by providing cooling device deenergization means that releases the engine-driven state of the cooling device when the clutch pedal is depressed. To provide a vehicle with an air conditioner that can perform the following functions.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 indicates a carburetor of an engine mounted on a vehicle equipped with an air-conditioning system, and a fuel cut valve 2 is inserted in the middle of a slow system passage of this carburetor 1. The fuel cut valve 2 is an electromagnetic valve that opens and closes the slow system passage according to the energization state to the excitation coil 2a, and the excitation coil 2a is connected to the battery 4 via the vacuum switch 3. The vacuum switch 3 has a diaphragm 3 when negative pressure is introduced into the vacuum chamber 3a.
The movable contact 3c held at b is the fixed contact 3d, 3
The vacuum chamber 3a is of a normally closed type and is turned off when separated from e, and the vacuum chamber 3a is opened into an intake manifold (not shown) via a negative pressure introduction pipe 5.
That is, when the inside of the intake manifold becomes in a high negative pressure (vacuum side) state by applying the engine brake to decelerate the vehicle, the vacuum switch 3 is switched to the OFF state and the fuel cut valve 2 is turned off. closes the slow system passage. Further, numeral 6 in the figure is an electromagnetic clutch inserted between the engine and the compressor of the cooling system. The electromagnetic clutch is configured to enter a power transmission state when the excitation coil 6a is energized, and enter a non-power transmission state when the energization is cut off.The excitation coil 6a is connected to a thermostat 7, etc. It is connected to the battery 4 via a power supply circuit 8.

In such a vehicle, when a clutch pedal 9 for operating a main clutch inserted between the engine and the transmission is depressed, a cooling device deenergizing means 11 cancels the driving state of the cooling device by the engine. has been established. The cooling device deenergizing means 11 includes a switch 12 inserted in the power supply circuit 8 which is switched in conjunction with the clutch pedal 9, and this switch 12 is switched in the manner shown in FIG. It is set as follows. That is, the switch 12 is a normally closed type that maintains the ON state when the clutch pedal 9 is released. When the clutch pedal 9 is depressed, the switch 12 is turned off before the clutch is released.

With this kind of configuration, when the clutch pedal 9 is depressed, the electromagnetic clutch 6 becomes a non-power transmitting state, and the state in which the air conditioner is driven by the engine is released, so there is no need for a special idle-up mechanism. However, it is possible to eliminate the inconvenience that the idling rotational speed is extremely reduced due to the load on the compressor of the air conditioner, causing the engine to stall. And this one is clutch pedal 9
Since the load from the air conditioner is removed from the engine in conjunction with the depression of the clutch pedal, the engine stall is particularly effective in situations where engine stalling is most likely to occur, that is, when the clutch pedal is depressed after continuing to decelerate with the fuel cut off. It can exert a preventive effect. That is, if the clutch pedal 9 is depressed during fuel cut during deceleration, the reverse driving force from the wheels to the engine is suddenly cut off. Therefore, if the compressor of the air conditioner is left running in this state,
This load causes the engine speed to drop extremely, and even if fuel supply is restarted, the engine is likely to stop due to the delay. On the other hand, according to the configuration of this device,
The moment the clutch pedal 9 is depressed, the load caused by the compressor drive is removed from the engine. As a result, it is possible to minimize the drop in engine speed at the moment when the reverse driving force from the wheels to the engine is cut off, and it is possible to effectively prevent the engine from stopping, which is likely to occur at that moment. Therefore, it is possible to expand the fuel cut range to a lower rotation range, and it is possible to improve fuel economy.

In the above embodiment, a case has been described in which the cooling device deenergizing means can be operated at all times, but it goes without saying that the present invention is not limited to this. For example, as shown in FIG. Thus, the cooling device deenergizing means 11 may be operated only during deceleration when the fuel cut is operating. That is, what is shown in FIG.
etc., and a subsequent circuit 8b in which a switch 12 constituting the cooling device deenergizing means 11 is inserted.
A bypass circuit 13 is provided in parallel with the downstream circuit 8b and the bypass circuit 13, and the downstream circuit 8b and the bypass circuit 13 are selectively connected to the downstream circuit 8b and the bypass circuit 13 at a branch point between the downstream circuit 8b and the bypass circuit 13.
A changeover switch 14 connected to the vacuum switch 3 is provided, and the changeover switch 14 is switched by the operation of the diaphragm 3b of the vacuum switch 3. The changeover switch 14 has, for example, a first fixed contact 14a connected to the latter stage circuit 8b, and a second fixed contact 14a connected to the bypass circuit 13.
4b and a movable contact 14c connected to the pre-stage circuit 8a, and when the pressure in the vacuum chamber 3a of the vacuum switch 3 approaches high vacuum, the movable contact 14c Fixed contact 14
When the movable contact 14c comes into contact with the second fixed contact 14b when the pressure in the vacuum chamber 3a becomes close to atmospheric pressure.

However, with this type of system, the front stage circuit 8a and the rear stage circuit 8b are connected only when the inside of the intake manifold is in a high negative pressure state, so when the clutch pedal 9 is depressed during deceleration, Only then will the cooling device deenergizing means 11 operate to disconnect the cooling device compressor from the engine.

Further, in each of the above embodiments, the present invention is applied to a vehicle that does not have an idle up mechanism at all, but the present invention is not necessarily limited to such a vehicle. For example, the present invention is not limited to such a vehicle. However, the present invention can also be applied to a vehicle in which the operation of the mechanism can be stopped by operating a switch or the like.

Since the present invention has the above-described configuration, when the clutch pedal is depressed to stop the vehicle from the fuel cut state during deceleration or to shift to acceleration, the air conditioner deenergizing means operates, and the air conditioner deenergizes. The compressor will be separated from the engine. Therefore, if the clutch pedal is depressed while there is little fuel in the slow port or intake manifold, problems that are likely to occur will occur.In other words, if the clutch pedal is depressed during deceleration due to engine braking, the transmission of fuel from the wheels to the engine will be reduced. Since the reverse driving force is suddenly cut off, it is possible to effectively prevent the engine from stopping due to the presence of a load from the cooling compressor or a delay in fuel recovery. Therefore, with such a structure, the fuel cut area can be expanded without difficulty, and the excellent effect of effectively improving fuel economy can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory circuit diagram showing one embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation of the same embodiment. FIG. 3 is an explanatory circuit diagram showing another embodiment of the present invention. 6...Electromagnetic clutch, 9...Clutch pedal,
11... Cooling device deenergization means, 12... Switch.

Claims (1)

[Scope of utility model registration request] It does not include an idle up mechanism that increases the idling speed of the engine only when the compressor of the air conditioner is driven, or it is configured so that the operation of the mechanism can be stopped,
A vehicle equipped with an air-conditioning system, characterized in that the vehicle is configured to cut fuel to the engine during deceleration by engine braking, and is provided with compressor deenergization means for canceling the compressor drive state by the engine when the clutch pedal is depressed. .