JPS62191631A - Engine with mechanical supercharger - Google Patents

Abstract

PURPOSE:To improve acceleration property in transience in a mechanical supercharger driven by an engine through a stepless speed change gear, by controlling temporarily largely the change gear ratio of said gear compared with that in the stationary time when the engine is in the transient running. CONSTITUTION:A compressor shaft 5 of a mechanical supercharger is driven by a crankshaft 2 of an engine through a belt type stepless speed change gear 3. In the stationary running and low rotation range, a solenoid valve 15 is controlled by the output signal of small duty ratio from a controlling circuit 17 to increase servo oil pressure to a hydraulic servo device 10, narrow the pulley spacing of variable pulleys 7 and set the pulley ratio to large one. Also in high rotation range, the servo oil pressure is reversely lowered and the pulley ratio lessened. On the other hand, in abrupt acceleration, the duty ratio is lessened further than that in said case to increase the servo oil pressure, enlarge the pulley ratio temporarily and increase shaft torque.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an engine equipped with a supercharging section mechanically driven by an engine crankshaft, and particularly relates to transient control 311 of a system for continuously variable speed of a mechanical supercharger. In this type of mechanical supercharger, the compressor of the supercharger is generally driven directly by the engine crankshaft.
Compared to the IJF air turbo type, there is no need for a turbine that rotates at ultra high speed, and the engine speed and

[The advantage is that you only need a compressor of about the same size. However, in the #3 type, the performance of the supercharger is directly dependent on the engine rotation speed, and compared to the exhaust turbo type, the boost pressure characteristics and shaft torque performance are better at low rotations, but Even so, the efficiency of medium and high rotation culling has not been increased by +Ei. As a countermeasure against this, a low-speed Jf
i+ is considered, but this poses a problem in that the usable rotation range of the engine is limited by the limit rotation speed of the supercharger. [Prior art 1] Therefore, regarding the drive system of a conventional mechanical supercharger, there is a prior art, for example, in Japanese Utility Model Application Publication No. 57-184223, in which there is a continuously variable speed link between the engine crankshaft and the supercharger rotating shaft. It is shown that the gear ratio of the continuously variable transmission is increased in the low speed range to increase the speed of the supercharger, and is decreased in the high speed range to reduce speed. Problem 1 to be solved by the invention By the way, the control of the above-mentioned advanced IT technology is to control the gear ratio of the continuously variable transmission in the high and low speed ranges. It is possible to increase the pressure to 1!, which improves the supercharging pressure characteristics of a mechanical supercharger.However, there are six measures against transients such as acceleration, so the response in this case is poor. The present invention has been made in view of these points.The present invention is based on a system for continuously variable speed of the mechanical supercharging m, and is designed to improve the acceleration performance during transient periods. [1] The present invention aims to provide an engine with a mechanical supercharger that is equipped with a mechanical supercharger. In a system in which the transmission is configured to be transmitted to the compressor shaft of a mechanical supercharger through a step transmission Ht f6-, and the gear ratio of the transmission is controlled by the engine rotation speed,
It has a sensor that detects a transient state, and the output signal of the sensor causes the transient state to be detected. Sometimes, the gear ratio of the transmission is configured to temporarily increase to a larger value than in the steady state. [Function 1] Based on the above configuration, when Σ is in a transient state of acceleration, the speed is increased by the gear ratio of the transmission, and the output is temporarily increased to exceed the maximum supercharging B during steady operation. Become. In this way, according to the present invention, it is possible to increase the output during sudden acceleration and improve the acceleration performance toward a large value of 1. [Embodiment] Hereinafter, one embodiment of the present invention (91 is t''11) will be described with reference to the drawings.
Physically 2 Illustrate. To explain the outline of the engine J3 of the present invention in FIG. It is connected to the compressor shaft 5 of the feeder 4. The belt type continuously variable speed device 3 has a fixed pulley 6 attached to the crank@2 and a compressor shaft 5.
) 1 ■ KA between variable pulley 7 and both pulleys 6.7
The belt 8 has a belt 8 and a tensioner 9, and by changing the bobbin interval of the variable pulley 7, the pulley winding diameter of the belt 8 is changed by the tensioner 9, and the bobbin ratio, that is, the gear ratio, can be adjusted steplessly. It is designed to be converted to . To explain the control system of the belt type continuously variable transmission device 3 in FIG. 2, the variable pulley 7 is connected to the fixed side pulley 4
It consists of a movable pulley half-rest 7b that moves to change the pulley spacing, and a hydraulic lever 1 () is attached to this movable pulley half-shut 7h. From the oil pump 11, an oil passage 12 communicates with the hydraulic engine device 10 via a pressure regulating valve 24, an oil reservoir 25, and an orifice 2G.
A solenoid valve 15 for hydraulic control is provided in the middle of a drain oil passage 14 which branches into two and reaches an oil pan 13. The pressure regulating valve 24 is for applying a constant hydraulic pressure to the oil pressure pump 10 regardless of the rotation speed of the oil pump 110, and has a conventionally well-known structure. On the other hand, steady state! , II and III, a rotation sensor 11G for detecting the engine speed is installed on the side of the pulley 6 attached to the crankshaft 2. Additionally, a boost sensor 27 is provided in the suction pipe 1a to detect a transient state as part of the over-8J1115 control. So-C1 These sensors-
16° 21 is connected to the solenoid valve 15 via the control circuit 11. In FIG. 3, the electric circuit of the control circuit 17 is described as follows: an F-V converter 18 that converts a pulse signal from the rotation engine +t1e according to the engine speed into an analog value of voltage, and an output of this converter 18. It has a differential amplifier 19 that inverts the voltage, and a Zener diode 20 that keeps the voltage constant in the low rotation range. Also, as a transient control system, a differentiation circuit 28 that differentiates the suction pipe negative pressure from the boost sensor Fj 27 to determine the acceleration state;
How many times should the comparison circuit 29, which compares the set value α and outputs an output only in case of sudden acceleration, and the buffer 7 circuit 30, which outputs a constant box according to its output f4g, be used? And 1. The output of the Zener diode 20 and the buffer circuit 30 is the itch generator 3.
1, and a comparison circuit 22 compares it with the square wave of the triangular wave generation circuit 21 to output a duty signal, and a drive circuit 23 operates the solenoid valve 15 in accordance with this duty ratio. That is, in a low speed range where the engine speed is lower than a predetermined engine speed, the Zener diode 20 maintains a constant high voltage, the duty ratio becomes small, and the drain time of the solenoid valve 15 is shortened to reduce the oil pressure by 1/10. Increase the Nervo oil pressure and maintain a constant rotation ratio. Then, at a predetermined engine speed or higher, the voltage drop of the Zener diode 20 disappears, the low voltage is output as is, the duty ratio becomes large, and the drain time of the solenoid valve 15 becomes IC1.
The series bombing pressure is gradually lowered. Furthermore, in the above control, during sudden acceleration, the temporarily high voltage passed from the comparator circuit 29 to the buffer circuit 30 causes the duty ratio to be further reduced, reducing the drain time of the solenoid valve 15 and increasing the hydraulic pressure. . Next, the operation of the mechanically supercharged engine configured as described above will be explained with reference to Section 4t.4. The feeder 4 is constantly driven. At this point, in the low engine speed range during steady state, the control circuit 17
The servo oil pressure is increased by the solenoid valve 715 due to the output signal having a small duty ratio. For this reason, in the belt type continuously variable transmission 3, the variable pulley 7 has a narrower variable pulley 7, and its belt winding IY is increased by 1,000 y. The engine speed) is set high as shown in Figure 4 (2) to increase the speed.Then, the supercharger 4 is driven to rotate at high speed regardless of the engine speed being low, as shown in Figure 4 (b). , as shown in (c), the supercharging pressure and shaft 1-lux increase at a speed of 11°C.Next, in the IC1 rotation range above the predetermined engine rotation speed,
As the duty ratio of the output signal 8 of the control 11 circuit 17 increases sequentially and the servo oil pressure is lowered by the solenoid valve 1'), the belt type continuously variable transmission t! The pulley ratio of 3 is the 4th
J in the figure (to): The sea urchin becomes smaller and decelerates steplessly. With the lever, the supercharging pressure and shaft torque are approximately - along with the drive of the supercharging section 4.
The engine is stopped and the supercharger rotational speed is also suppressed below its limit rotational speed. On the other hand, “Second Stationary Tense?” At 211, the set value α or more -L
When the vehicle is accelerated to
) temporarily increases by Δ1 as shown by the dashed line. Therefore, the boost pressure temporarily reaches the maximum IU as shown in ) in the same figure.
J: becomes higher and the shaft torque increases as shown in the same figure (C). Although one embodiment of Mokbomei has been described above, the throttle opening degree tj may be used as the transient state detection sensor.

【Effect of the invention】

As described above, according to the present invention, mechanical supercharging (
In the system that controls the speed change of the engine, during transient situations such as sudden acceleration, the boost pressure is temporarily increased to increase the output.
Acceleration performance is improved. Since it is a temporal boost pressure upper limit, there is no problem with engine strength 1-.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the overall outline of an example of a track type supercharger (=J engine) by Mitsuaki Ki, Figure 2 is a configuration diagram of the control 011 system, and Figure 33 is a control unit]. Circuit diagram, Figure 4 (0
or C, > is the characteristic line [4. 1...Engine body 2...Crankshaft 3...Transmission 4...Mechanical supercharger 5...Compressor 16...Rotation sensor 17...Control unit 27...Boost Patent applicant Fuji Heavy Industries Co., Ltd. 111 people
Butt l! f! Atsushi Kobashi Atsushi I'I)
T? I'll J-j Ri no f
i-in-Akinia

Claims (1)

[Scope of Claims] In a system in which an engine crankshaft is configured to transmit power to a compressor shaft of a mechanical supercharger via a belt-type continuously variable transmission, and the gear ratio of the transmission is controlled by the engine rotation speed, a transient state is provided. An engine with a mechanical supercharger, the engine having a sensor that detects the above, and which temporarily controls the gear ratio of a transmission to be larger in a transient state than in a steady state based on an output signal of the sensor.