JPH02162119A - Capacity judging device for continuously variable capacity swash plate type compressor - Google Patents

Abstract

PURPOSE:To accurately control idle revolutions by providing a detected body at the outer spherical section of the swash plate of a swash plate type compressor, providing a detector within the variation range of a limit point at its lower dead center, and thereby converting detected pulse signals into stepwise capacity judging signals so as to be inputted into an engine control section. CONSTITUTION:A detected body 17 composed of a magnetic body is planted at the outer periphery of a rocking swash plate 11, and an electromagnetic induction type detector 18 is arranged on the wall of a crank room 2a corresponding to the operation locus of the detected body 17. The detector 18 outputs pulses every time when it meets the detected body 17. The pulse signals are converted into stepwise capacity judging signals based on the number of pulses every period so as to be inputted into an engine control section controlling idle revolutions. This constitution enables capacity information to be utilized for idle control, thereby making it possible to prevent engine stall and uncomfortable feeling at the time of idling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a continuously variable capacity swash plate compressor used for vehicle air conditioning, and more specifically, the present invention relates to a continuously variable capacity swash plate compressor used for vehicle air conditioning, and more specifically, a compressor that determines the capacity of the compressor in stages. The present invention relates to a capacity determination device that provides load information for an idle speed υ1111 to an engine control unit.

[Prior Art] An idle speed control mechanism always optimally controls the idle speed by adjusting the opening degree of an idle control valve provided in a bypass passage of an intake passage. The engine control unit that operates has engine speed,
In addition to cooling water temperature, vehicle speed, etc., air conditioning compressor operation information (ON,
OFF signal> is also input.

On the other hand, the reciprocating type compressors used for the above-mentioned air conditioning systems range from a constant capacity type to a stepwise variable capacity type, and a continuously variable capacity type swash plate type compressor is now being put into practical use.

[Problems to be Solved by the Invention] However, in the idle control of a vehicle equipped with the above-mentioned continuously variable volume swash plate compressor, the operating information of the compressor is limited to only the 0N1OFF signal, and the load (If control is performed without any capacity fluctuation information being provided, the idle control valve opening degree and target rotation speed that were learned during the initial idle link will not be able to respond to changes in the situation during driving, that is, capacity fluctuations.) This will control the starting conditions for the next idle link.

Therefore, if the capacity of the compressor decreases due to excessive cooling capacity as the rotational speed increases while driving, the next seven-sidle rotational speed will be much higher than the target value, causing discomfort, and may cause environmental problems. Conversely, if the capacity of the compressor increases due to slow speed driving due to changes or traffic jams, the idle speed may not reach the target value, which may lead to an unexpected situation such as the engine stopping.

A technical problem to be solved by the present invention is to constantly input load fluctuation information of the swash plate compressor to the engine control section to accurately control the idle speed.

[Means for Solving the yI Problem] In order to understand the load fluctuations of the compressor, the present invention attaches a detected object to the peripheral edge of the swash plate, and installs the detected object on the wall of the machine body surrounding the swash plate. A detector that emits a pulse each time it encounters the detected object is disposed in a fluctuation region of the bottom dead center side limit point of the detected object that is synchronized with the C piston stroke, and a detection signal from the detector is disposed. The engine adopts a new configuration that converts the signal into a stepwise capacity determination signal and inputs the signal to the engine control unit that controls the idle speed.

[Effect] Therefore, when the compressor is operating at a small capacity, the motion locus of the object to be detected is outside the detection range of the detector and no pulse is transmitted, and when the compressor enters medium capacity operation, The vicinity of the limit point on the bottom dead center side of the extended motion trajectory of the detected object was encountered and captured by the detector, and one pulse was transmitted in one revolution W1 (one rotation), and the compressor shifted to high-capacity operation. In this state, a further expanded motion locus of the object to be detected passes through the detector and is captured by the detector on both the forward and backward paths, so two pulses are emitted. That is, while the compressor is in operation, its capacity is converted into a stepwise discrimination signal based on the number of pulses per cycle and is input to the engine control section. Then, the engine control unit uses various vehicle status information including the capacity information of the compressor as 6, and adjusts the control air and fuel injection amount to 1lJI]]L, and the idle rotation speed via the idle control valve. .

[Example] Hereinafter, an example of the present invention will be specifically described based on the drawings.

FIG. 1 shows a rocking swash plate type compressor of the present invention, in which a front housing 2 and a rear housing 3 are connected to the front and rear of a cylinder block 1 that constitutes a part of the outer shell of the compressor. A rotary shaft 4 is rotatably supported by the cylinder block 1 and the front housing 2. A rotary support 5 is shown on the rotary shaft 4 in the front housing 2, and a long hole 6a is provided at the tip of a support arm 6 extending toward the rear side of the rotary support 5.

A pin 7 is slidably fitted into the elongated hole 6a, and a rotary drive plate 8 is connected to the pin 7 so as to be tiltable.

A sleeve 9 is slidably fitted onto the rotating shaft 4 adjacent to the rear end of the rotating support 5, and is always urged toward the rotating support 5 by a spring 10, and protrudes from both left and right sides of the sleeve 9. The provided support shaft 9a (only the minus side is shown) is fitted into an engagement hole (not shown) of the rotary drive plate 8, and the rotary drive plate 8 is supported so as to be movable around the support shaft 9a.

A rocking swash plate 11 is supported on the rear side of the rotary drive plate 8 so as to be relatively rotatable, and a notch 11a provided at the outer edge engages with a through bolt 16 to restrain rotation, and the cylinder block A piston 13 in a bore 12 extending through the piston 1 and the swinging swash plate 11 are connected by a piston rod 14. Therefore, the rotational motion of the rotary shaft 4 is converted to the back and forth reciprocating motion of the rocking swash plate 11 via the rotary drive plate 8, and the piston 13 moves back and forth within the bore 12, thereby moving from the suction chamber 3a into the bore 12. The sucked refrigerant gas is compressed and discharged to the discharge chamber 3b. And the pressure in the crank v2a and the suction pressure in the bore 12 of the piston 1
The stroke of the piston 13 changes depending on the differential pressure across the piston 3, and the inclination angle of the rocking swash plate 11 changes. Note that the pressure within the crank chamber 2a is controlled by an electromagnetic control valve mechanism 15 disposed within a protrusion at the rear end of the rear housing 3 based on the cooling load.

A detection object 17 made of a magnetic material is implanted on the outer peripheral edge of the swinging swash plate 11, and a wall section of the crank chamber 2a corresponding to the motion locus of the detection object 17 is provided with an electromagnetic induction type detection device, for example. A container 18 is provided. The detector 18 emits a pulse each time it encounters the detected object 17, and the signal is converted into a stepwise capacity discrimination signal based on the number of pulses per cycle, and sent to the engine control unit that controls the idle speed. is input.

The positional relationship between the motion locus of the detected object 17 and the detector 18, which varies depending on the compressor capacity, and the pulse transmission situation will be explained in more detail with reference to FIGS. 2 and 3.

(a) to (e) in Fig. 2 represent the operating locus of the detected object 17 according to the capacity of the compressor, where (a) is the minimum capacity, (e) is the maximum capacity of 1L (C) is Intermediate volume ff1v!
The right end of each trajectory line is the unchanging limit point on the top dead center side, and the left end is the varying limit point on the bottom dead center side. and detector 18
is arranged in the fluctuation region of the limit point on the bottom dead center side (the region between broken lit in the figure), and in the embodiment shown in the figure, it is placed approximately at the center (position P) of the fluctuation region.

FIG. 3 shows the pulse generation situation detected by the detector 18, and (a) to (e) in the figure correspond to the capacity-based symbols (a) to (e) in FIG. 2, respectively. That is, at the minimum capacity (a), the detected object 17 does not reach the capture range of the detector 18 and the electromotive force E is 0, so no pulse is generated.

In the intermediate volume 11R(c), the detected object 17 is connected to the detector 1.
8 is encountered completely, so the maximum output pulse occurs once per period. At the time of the largest container (e), the object 17 to be detected sufficiently exceeds the capture range of the detector 18 and then turns around, so similar pulses are generated twice on both the outward and return paths.

Note that, as shown in (b) in the figure, if the motion trajectory of the detected object 17 is somewhat shorter than that at the intermediate capacity (C), a pulse with a small output corresponding to the degree is generated once. However, as shown in (d), if the operating trajectory is somewhat longer than that at the intermediate capacity (C), two pulses will be generated, including one with a small output corresponding to the degree. Become. Therefore, if we define the output limit value of the pulses to be counted and rearrange this, we can see that (a) to (1)) have a small capacity of 0 pulses, and (b) to (d) have a capacity of 1 pulse. Capacity, (d) ~
(e) can be easily distinguished into three levels, such as large capacity with two pulses. In this case, when the minimum capacity is 10% and the maximum capacity is 100%, the above three stages of capacity distribution can be set arbitrarily by selecting the installation position of the detector 18 and the output limit value of the pulses to be counted. It is possible to do so.

FIG. 4 shows an idle speed control mechanism in which the compressor capacity signal outputted by the capacity determination device of the present invention is added to one of the vehicle status information. A combustion chamber 24 is formed in which a piston 23 is accommodated in a freely movable manner. intake boat 25
by the intake valve 26, and the exhaust boat 27 by the exhaust valve 2.
8 respectively. A fuel injection valve 29 is arranged near the intake boat 25. An air filter 32 is disposed at the most upstream side of the intake passage 31 communicating with the intake boat 25.
An air 70 meter 33 is provided, and a throttle valve 34 is provided downstream thereof. The upstream and downstream sides of the throttle valve 34 are connected by a bypass passage 35, and the flow area of the bypass passage 35 is adjusted by an idle control valve 36.

The idle control valve 36 is, for example, a near solenoid valve, and its opening degree is always adjusted by the engine control section 41, thereby controlling the idle rotation speed i, IJ. The opening degree of the idle control valve 36 is adjusted depending on the duty ratio of the energization time of the solenoid 37, and the duty ratio is 0.
%, it is fully closed, and when the duty ratio is 100%, it is fully open.

The engine control unit 41 determines the duty ratio of the energization time of the solenoid 37 of the idle control valve 36, and connects a microprocessing unit (MPU) 42, a memory 43, an input port 44, and an output boat 45. It consists of a bus 46. Various vehicle status information, which will be described later, is input to the input port 44, and the output port 4
5 is connected to the solenoid 37 of the idle control valve 36. The MPU 42 determines the duty ratio of the energization time to the solenoid 37 according to the program stored in the memory 43.

51 to 58 are parameters inputted to the input port 44 as vehicle state information, 51 is a signal corresponding to the engine speed, 52 is an ON signal of the idle switch when the opening degree of the throttle valve 34 is below a predetermined value, 53 is a signal corresponding to the vehicle speed, 54 is attached to the automatic transmission of an automatic car, and the shift lever is in the neutral range (N range)
Or the neutral ON signal when in the parking range (P range), 55 is the air conditioning pressure li! Turn on the machine
Signal 56 is an oil pressure ON signal when the discharge pressure of the pump of the power steering device is above a predetermined value, 57
is a signal according to the cooling water temperature. And 58 is according to the present invention -rV? These are the eight signals of the oscillating swash plate compressor based on the capacity determination given by m.

Therefore, the compressor load (capacity determination) information output by the device of the present invention is always given to the engine II1111II section 41 even when running, and the engine control section 41 immediately controls the target rotation speed after inputting the load fluctuation. Since the engine speed is predicted and the idle control valve 36 is operated to adjust the control air amount and the corresponding fuel injection amount at the next idling time, it is possible to keep the engine speed close to the appropriate value at all times.

By the way, when the capacity of the compressor is made variable in the range of 10 to 100%, with conventional control using only ON and OFF signals,
Engine speed at idle link is 30Or, p, m,
It is said that the impact of the compressor is different depending on the degree of damage, and there are concerns about engine stoppage accidents and discomfort felt by the driver.As mentioned above, the compressor capacity is divided into three levels. , if this information is given to the engine control unit 41, the influence on the engine speed during idling will be 100%.
It is possible to keep the value to a very small value, which is less than r and pom. Although the above-mentioned embodiment has been explained with respect to a oscillating swash plate type compressor, the detection means for a rotary swash plate (variable angle) type compressor can be used, for example, to detect the motion locus of an object to be detected installed in the neck of the piston. can also be detected by a detector installed in the cylinder block. In addition, when the piston is a double-ended type, the limit point on the bottom dead center side is the piston on the side that has an unchanged top dead center and is the reference point for the control of the swash plate inclination, regardless of the capacity detection means. It is aimed at the head.

Furthermore, the idle control in the above explanation, that is, the control air volume and fuel injection amount υJi through the idle control valve.
lt can also be implemented by replacing this with ignition timing control.

[Effects of the Invention] As described in detail above, the present invention has a detection object attached to the peripheral edge of the swash plate, and a detection object disposed in the fluctuation region of the bottom dead center side limit point of the detection object that changes according to the piston stroke. The system uses a detector to emit pulses, converts the signal into a stepwise capacity discrimination signal, and adds this to the idle control information, so it can be compressed simply by measuring the number of pulses per cycle. Since the capacity of the compressor can be determined in the cylinders, and the determined capacity information is accurately utilized for idle control, engine stalling, which is a concern when idling a vehicle equipped with a continuously variable displacement swash plate compressor, can be avoided. It can completely eliminate discomfort.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the oscillating swash plate type compression method according to the present invention, Fig. 2 is an explanatory drawing showing the motion locus of the object to be detected and the arrangement position of the detector, and Fig. 3 is the capacitance. An explanatory diagram showing another pulse generation situation, FIG. 4 is a sectional view showing the idle control mechanism. 1... Cylinder block 2a... Crank empty 1
1... Rocking swash plate 13... Piston 17-
・Detected object 18 ・Detector 41 ・Engine υ"

Claims (1)

[Claims] In a continuously variable capacity swash plate compressor configured to change the piston stroke by controlling the inclination angle of a swash plate that follows rotation of a drive shaft, a detected object is attached to the peripheral edge of the swash plate, and the swash plate A detector that emits a pulse each time it encounters the detected object is disposed in the wall of the aircraft surrounding the body and in the fluctuation region of the limit point on the bottom dead center side of the detected object that is synchronized with the piston stroke. Continuously variable capacity swash plate compression, characterized in that the detection signal from the detector is converted into a stepwise capacity discrimination signal and inputted to an engine control unit that controls the idle speed. Machine capacity determination device.