JPH0714687B2 - Vehicle air conditioner controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle air conditioner control device, and more particularly to a vehicle air conditioner control device that prevents engine performance deterioration due to air conditioner operation.

[Prior Art] In a vehicle air conditioner, power transmission to a cooler compressor that sucks and compresses a refrigerant gas and circulates the refrigerant is generally performed via a magnetic clutch that is an electromagnetic joint. As a result, it is possible to operate the cooler independently of the rotation of the engine, drive the compressor only when the cooler is necessary, and perform stop control when it is not.

However, since the engine load rapidly increases as soon as the magnet clutch is turned on, so-called undershoot of engine rotation often occurs, and in the worst case, engine stall (hereinafter referred to as "stalling") may occur. .

In order to prevent this, a control system has been proposed in which a condition for holding the engine in a minimum drivable state is set in advance and only when the condition is satisfied, the magnet clutch is connected to operate the cooler.

For example, in Japanese Utility Model Publication No. Sho 58-44216, the air conditioner operation is stopped when the engine load exceeds a reference value, and in Japanese Patent Application No. Sho 62-094469, the shift gear of the automatic transmission is a driving range with a large engine load. A configuration for stopping the air conditioner or reducing the load factor of the air conditioner when the vehicle enters is disclosed.

Furthermore, recent air-conditioned vehicles are equipped with an idle-up function that increases engine idle speed by 100 to 200 rpm when the air conditioner is operating or when various other loads are applied to cover engine performance deterioration due to air conditioner load. Has been done.

[Problems to be Solved by the Invention] Problems of Prior Art However, in the prior arts disclosed in the above-mentioned respective documents, the conditions that serve as the standard for air-conditioner control are uniform, so that the type of vehicle or the moment Poor adaptability to changing engine usage conditions.

Therefore, the on / off control of the air conditioner is not always appropriate and appropriate for the engine condition on the spot, and the air conditioner is turned on even if there is a risk of engine stalling, or the air conditioner is unnecessarily activated. In some cases, it is prohibited, and there is a problem in that an appropriate control action that satisfies the passenger cannot be obtained.

In addition, the idle-up function generally operates at the same time when the magnet clutch and other various loads are turned on. This means that the clutch is turned on while the original idle-up function does not work sufficiently, that is, before the engine speed rises to a value that can withstand the load of the air conditioner, and the effect is not exerted. There was a drawback that it led to stalling.

OBJECT OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and an object thereof is a vehicle capable of reliably avoiding deterioration of engine performance by performing fine and accurate engine operation control according to various situations. It is to provide an air conditioner control device for a vehicle.

[Means for Solving the Problems] In order to achieve the above object, the present invention is an engine air conditioner control device for a vehicle having a magnet clutch for intermittently transmitting operation transmission of a cooler compressor. Means, an electric load detecting means for detecting the presence or absence of an electric load on the engine, a first elapsed time detecting means for detecting a first elapsed time after the electric load has acted, an automatic transmission or a manual transmission. A vehicle type determining means for determining whether the vehicle is a vehicle, a shift range detecting means for detecting a shift range of an automatic transmission in an automatic transmission, and a second range after the shift range detecting means enters a predetermined range with a large engine load. Second elapsed time detecting means for detecting an elapsed time, the first elapsed time being less than or equal to a first predetermined value, and the vehicle type detecting means And a magnetic clutch control unit that controls the magnetic clutch to be in a disengaged state when at least one of the second elapsed time is equal to or less than a second predetermined value is detected by the automatic transmission. , Equipped.

[Operation] In the present invention configured as described above, the on / off control of the magnet clutch for operating the air conditioner is performed, the engine speed, the presence / absence of an electric load, the determination of the automatic transmission or the manual transmission, and the automatic transmission. In this case, each determination and detection measurement such as whether or not a predetermined time has elapsed after the current shift position and the specific range shift gear are engaged are performed.
Then, the idle-up function determines that there is no undershoot of the engine speed at the moment when the load is applied and that the engine is in a stable state if 3 seconds have elapsed after the load was applied, that is, after the load was applied.

First, it is determined whether the engine speed has reached a predetermined value, and then it is determined whether or not there is an electric load. If the conditions are not satisfied, the magnet clutch is off-controlled, and the air conditioner load is prohibited. Here, even if an electric load is applied, if 3 seconds or more have passed, the operation of the air conditioner is not prohibited and the process proceeds to the next step.

If the above conditions are satisfied, the vehicle type is determined next as to whether the vehicle is an automatic transmission vehicle or a manual transmission vehicle, and then it is determined whether or not the vehicle type conforms to the criteria set for each vehicle type. In the case of an AT vehicle, when the shift range is within D or R, it is checked whether or not the idle-up function is exerted as in the case of the electric load.

The magnet clutch is turned on only when all the conditions are met.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration example of a vehicle air conditioner control device according to the present invention. In the figure, an air conditioner amplifier 12 including a magnet clutch 28 and an idle-up function 30 is connected to a magnet clutch control circuit 10 included in an ECU that comprehensively controls an air conditioner for a vehicle.

The output signal S _o from the magnet clutch control circuit 10 and the temperature detection signal S _t from the temperature detector 14 are the air conditioner amplifier.
The magnetic clutch 28 is supplied to both input terminals of the AND gate 16 in 12 and gate output based on both input signals.
And the idle-up mechanism 30 includes a drive transistor 20, a diode 22, a solenoid 24, and a magnet clutch relay.
Controlled via 26.

A characteristic of the present invention is that the magnet clutch control unit 10 includes detection signals S _r and S _l from engine speed detection means, electric load detection means, vehicle type determination means, and shift range detection means (not shown). , S _k , S _s are supplied, and based on these detection signals, the control of the magnet clutch 28, that is, whether or not the cooler is on-operated is determined.

Next, the operation will be described with reference to the flowchart of FIG. As described above, in the present invention, four types of detection signals are supplied to the magnet clutch control section. First of all, the fluctuation of the engine speed, that is, the amount of decrease in the engine speed is detected based on the engine speed detection signal S _r, and is it a predetermined allowable value ΔNE or less that does not cause engine stall even when the air conditioner is turned on? Whether or not it is determined in S.100. If the decrease amount is ΔNE or more, the process proceeds to S.190 and the air conditioner is stopped and controlled.

If ΔNE or less, the presence or absence of an electric load is determined in the next S.110. Here, the electric load refers to, for example, an alternator drive, an electric fan, a head lamp, a load of a brake lamp, or the like that may deteriorate engine performance and cause an undershoot of the rotation speed. If a load from such other factors is also applied at the same time when the magnet clutch is turned on, the possibility of engine stalling becomes extremely high. Therefore, when the electric load is already applied, the routine proceeds to step 120, where it is determined whether or not 3 seconds have elapsed after the electric load is turned on, and if it is 3 seconds or less, engine operation is prohibited in S.190. .

If it is determined in step 120 that 3 seconds have elapsed, it is considered that there is no undershoot of the engine speed, and therefore it is considered that there is no influence of the electric load. In this case and when it is determined in S.110 that there is no electric load, S.130
Then, the vehicle type discrimination is performed as to whether the vehicle is a manually-shifted vehicle or an automatically-shifted vehicle.

If the vehicle is an automatic transmission, the process proceeds to S.140 and the current shift range is detected. If the load is in the D (drive) or R (reverse) range, the S.
In the case of 120 as well, in S.150, it is determined whether or not 3 seconds have elapsed since the shift gear entered the range.

If it is less than 3 seconds, the undershoot of the engine speed will be large, so if the engine load is further applied in the heavy load D and R range, there is a greater risk of engine stalling, so proceed to S.190. Prohibit air conditioner operation.

On the other hand, if 3 seconds have elapsed, it is determined that there is no engine speed undershoot due to the load of the automatic transmission, and S.16
At 0, is the engine speed 750 rpm or more which is the idle speed in the D or R range (the minimum value at which the engine can be operated stably by the action of the idle-up function during idling and can be started smoothly)? It is determined whether or not. If YES, the process proceeds to S.180, and the air conditioner is turned on for the first time, and if it is ON, S.190
Is turned off at.

On the other hand, if it is determined in S.130 that the vehicle is a manually variable vehicle and if the shift range detected in S.6 is N (neutral), the process proceeds to S.170, where the idle speed is in the neutral range. It is determined whether or not the idle speed is 950 rpm or more, and if YES,
The air conditioner is on-controlled in S.180, and if NO, the process proceeds to S.190 to be off-controlled.

As described above, according to the present invention, since the condition for turning on the magnetic clutch for operating the air conditioner is set individually for each engine usage condition and vehicle type, a more appropriate and detailed air conditioner operation control is performed, and engine performance is improved. Deterioration In particular, it is possible to prevent the on-operation that leads to engine stalling, and the cooling performance of the air conditioner is not deteriorated.

[Effects of the Invention] As described above, according to the present invention, after it is confirmed that engine stall and deterioration of engine performance do not occur, that is, it is confirmed that the idle-up function works sufficiently and the engine is Since the magnetic clutch is turned on during stable driving, the air conditioner control function is significantly improved, and the vehicle user can operate the air conditioner with peace of mind.

[Brief description of drawings]

FIG. 1 is a configuration example of a vehicle air conditioner control device according to the present invention, and FIG. 2 is a flowchart of its operation. 10 …… Magnet clutch control circuit 28 …… Magnet clutch S _r …… Engine speed detection signal S _l …… Electrical load detection signal S _k …… Vehicle type detection signal S _s …… Shift range detection signal

Claims (1)

[Claims] 1. An engine speed detecting means for detecting an engine speed in a vehicle air conditioner control device having a magnet clutch for intermittently transmitting operation transmission to a cooler compressor,
An electric load detecting means for detecting the presence or absence of an electric load on the engine; a first elapsed time detecting means for detecting a first elapsed time after the electric load is applied; and an automatic transmission vehicle or a manual transmission vehicle. A vehicle type determining means for determining, a shift range detecting means for detecting a shift range of an automatic transmission in an automatic transmission, and a second elapsed time after the shift range detecting means enters a predetermined range with a large engine load. A second elapsed time detecting means for detecting, wherein the first elapsed time is equal to or less than a first predetermined value, or the vehicle type detecting means detects that the vehicle is an automatic transmission, and the second elapsed time is detected. Is a second predetermined value or less, and a magnet clutch control unit for controlling the magnet clutch to a disengaged state is detected when at least one of them is detected. A vehicle air conditioner controller.