JPS62247139A - Intake device for engine - Google Patents

Abstract

PURPOSE:To prevent the stall of an engine without deteriorating the feeling of deceleration at the time of sharp deceleration, by gradually increasing the quantity of auxiliary air for an engine along with the shifting of an automatic transmission to a lower speed stage at the time of deceleration. CONSTITUTION:An automatic transmission 17 containing a torque converter 18 is connected to the output shaft 6 of an engine 1. A means 34 for detecting the deceleration of an engine 1, a means 24 for feeding auxiliary air to the engine, and a means 35 for controlling the auxiliary air feed means at the time of detection of the deceleration are provided. Besides, a means 32 for detecting the speed stage in which the automatic transmission 17 is, and a means 36 for modifying the control by the means 35 to increase the quantity of the auxiliary air for the engine according as the detected speed stage goes down are provided. When the quantity of the auxiliary air is set to be large at the time of the deceleration, the quantity of the auxiliary air is increased or decreased depending on the speed stage in which the automatic transmission 17 is.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine intake system, and more particularly to an improvement in an engine intake system that supplies auxiliary air to the engine during deceleration operation to prevent stalling.

(Prior Art I) Conventionally, as the intake air H of this type of engine, for example, as disclosed in Japanese Utility Model Publication No. 55-2194,
The engine is equipped with a bypass passage that bypasses a throttle valve in the intake passage of the engine, and a control valve that opens and closes the bypass passage, and during deceleration operation, the bypass passage is opened by the control valve to supply auxiliary intake air to the engine. Engines are known that effectively prevent engine stalling by suppressing a significant drop in engine speed.

(Problems to be Solved by the Invention) By the way, in the engine intake system as described above, the supply amount of auxiliary intake air at A3 during deceleration operation varies depending on the magnitude of the load connected to the output shaft of the engine, and in particular, When an automatic transmission with a built-in torque converter is connected to the output shaft of the engine, most of the drive torque is used to drive the torque converter during idling, resulting in a noticeable drop in engine speed. Therefore, it is necessary to set a large amount of auxiliary air.

However, when the amount of auxiliary air is set to be large as described above, the following disadvantages occur during sudden deceleration operation. That is,
When the engine's automatic transmission suddenly decelerates while the power transmission path is in high gear, for example in fourth forward gear,
Although the engine speed quickly decreases as the vehicle speed decreases, a large amount of auxiliary air flows in from 4th gear at the beginning of deceleration, causing a decrease in driving torque, and as a result, the desired deceleration effect cannot be obtained. , the feeling of deceleration decreases, which causes regret.

The present invention has been made in view of the above, and its purpose is to set a large amount of auxiliary air during deceleration operation in an engine connected to an automatic transmission having a built-in torque converter as described above. In this case, the purpose is to effectively prevent engine stalling without impairing the feeling of deceleration even during sudden deceleration operation by increasing or decreasing the amount of auxiliary air according to the gear position of the automatic transmission.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is as shown in FIG. Assumes an intake device. A deceleration operation detecting means 34 detects when the engine 1 is decelerating; an auxiliary air supply means 24 supplies auxiliary air to the engine 1; A control means 35 is provided for controlling the auxiliary air supply means 24 so as to supply auxiliary air to the air. Furthermore, the automatic transmission 17
a gear position detecting means 32 for detecting the gear position; and a control means 3 which receives the output of the gear position detecting means 32 and increases the amount of auxiliary air to the engine 1 when the gear position becomes a low speed side.
In this embodiment, a correction means 36 is provided for correcting the control of the auxiliary air supply means 24 by 5.

(Function) With the above configuration, in the present invention, during deceleration operation, the auxiliary air supply means 24 is controlled by the control means 35 to supply auxiliary air to the engine 1, so that the stall of the engine 1 can be effectively prevented. Prevented.

At that time, the amount of auxiliary air to the engine 1 is determined by the correction means 36.
: The torque is corrected and increases when the gear is on the low speed side, so even if part of the drive torque is spent on the torque converter 18 during idling, the drop in engine speed is effectively suppressed. Stalls are reliably prevented. However, when there is a sudden deceleration from a high-speed gear, the initial amount of auxiliary air is adjusted to a small amount, so as the engine speed drops, the drive torque follows and quickly decreases, making deceleration operation more effective. This is done to ensure a good sense of deceleration.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows an embodiment in which the present invention is applied to an intake system of a rotary engine, in which reference numeral 1 is a rotary engine, and the rotary engine 1 has two joints and a coid-shaped inner peripheral portion 2a.
A substantially triangular rotor 5 is supported by an eccentric shaft 6 serving as an output shaft and rotates planetarily within a casing 4 formed of a rotor housing 2 having a rotor housing 2 and side housings 3 located on both sides of the casing 4. Three operations occur inside the casing 4 as the rotor 5 rotates! 7.7゜7
, and the intake, compression, explosion, expansion, and exhaust strokes are performed in sequence.

An intake boat 10 that is opened and closed by the side surface of the rotor 5 is opened in one side of the side housing 3, and an intake passage 11 that supplies intake air to the working chamber 7 is connected to the intake boat 10. In the middle of the passage 11, there is a throttle valve 12 for controlling the amount of intake air;
Air flow sensor 13 that measures the amount of intake air on the upstream side of
and a fuel injection valve 14 that injects and supplies fuel downstream of the throttle valve 12 are provided.

An automatic transmission 17 is connected to the eccentric shaft 6. The automatic transmission 17 includes a torque converter 18 including a pump 18a connected to the eccentric shaft 6, a stator 18b, and a turbine 18C, and a turbine 18G of the torque converter 18.
For example, four forward speeds are connected to a converter output shaft 19 extending from the converter output shaft 19 .

It consists of a planetary gear type transmission a-20 with one reverse gear, and when the engine is idling, the eccentric shaft 6
The rotational force of the torque converter 18 is absorbed by the fluid sliding inside the pump 18a of the torque converter 18, thereby preventing the vehicle from starting as much as possible.

Further, a bypass passage 22 that bypasses the throttle valve 12 is connected to the intake passage 11, and a control valve 23 for changing the passage area of the bypass passage 22 is arranged in the bypass passage 22. By opening and closing the bypass passage 22 by the valve 23, an auxiliary air supply means 24 is configured to supply auxiliary air to the engine 1 through the bypass passage 22.

Furthermore, 30 is an opening sensor that detects the opening of the throttle valve 12, and 31 is an eccentric valve 1 of the engine 1.
! A rotation speed sensor 32 detects the engine speed based on the rotation angle of the foot 6, and 32 is a gear position sensor as a gear position detecting means capable of detecting the current gear position of the gear shift mechanism 20 of the automatic transmission 1s17. The detection signals of j30 to j32 each control the control valve 23 of the bypass passage 22.
The data is input to a controller 33 having a CPU and the like.

Next, the operation of the controller 33 will be explained based on the flowchart of FIG. Start, step S
At step S1, the rotation speed signal from the rotation speed sensor 31 is read, and at step S2, the rotation speed signal from the opening sensor 30 is read. - After reading the book volume signal, it is determined in step S3 whether or not the engine operating range is in the deceleration range based on these two signals, and if the answer is No that the engine operating range is not in the deceleration range, in step S4, for example, The amount of bypass intake air in the bypass passage 22 is set to an initial value corresponding to the gear position of the transmission 4M20.

On the other hand, in the case of deceleration operation in the deceleration region in step S3, the gear position signal from the gear position sensor 32 is read in step S5, and then it is determined in step S8 whether or not this gear position is the first forward speed. In addition, in step S7, it is determined whether or not the forward speed is the second forward speed, and in step S8, it is determined whether the forward speed is the third forward speed.If the forward speed is the first speed, the bypass is selected in step S9 as shown in FIG. The bypass intake IQ (that is, the auxiliary air M) of the passage 22 is set to the first set value Q1, which is a large value, while in the case of the second forward speed, the bypass intake IQ (that is, the auxiliary air M) is set to the first set value Q1, which is a smaller value than the first set value Q1 in step S1. 2 settings! mQ2 (Q
2 <Ql), and in the case of the third forward speed, a third set value Q3 (Ql <02) which is smaller than the second set value Q2 is set in step Sn. In addition, in the case of the fourth forward speed, the third set value Q is set in step S12.
The fourth set value Q4 is smaller than 3 (Q4 <Qt
).

After setting the amount of auxiliary air to the engine 1 in this way, the operation of the control valve 23 is controlled so that the amount of auxiliary air reaches this set value in step SL3, and the bypass passage 22 is controlled to operate.
By increasing or decreasing the passage area of
1 to S3 constitute a deceleration operation detection means 34 that detects the deceleration operation of the engine, and step S+a constitutes the deceleration operation detection means 3 that detects the deceleration operation of the engine.
4 during deceleration operation, the auxiliary air supply means 24 (
Specifically, it constitutes a control means 35 which controls the control valve 23) to supply auxiliary air to the engine 1. Further, in steps 85 to S12, the control means 35 receives the output of the gear position sensor 32 and controls the amount of auxiliary air in the bypass passage 22 to increase as the gear position becomes lower.
A correction means 36 is configured to correct the operation control of the auxiliary air supply means 24 by the auxiliary air supply means 24.

Therefore, in the above embodiment, when the engine operating state shifts to the deceleration region, the control means 35 controls the amount of the control valve 23 to open the bypass passage 22, so that auxiliary air flows through the bypass passage 22. Since the fuel is then supplied to the engine 1, a significant drop in engine speed is suppressed and stall is effectively prevented.

At this time, the gears are automatically switched sequentially to the low speed side by the shift + [2O of the automatic transmission 17, and as the gears are switched to the low speed side, the auxiliary air suspension of the bypass passage 22 is corrected and adjusted by the correction means 36. The amount of drive torque is adjusted so that it is less in high-speed gears and more in low-speed gears, so during idle operation a-1, part of the drive torque is spent in torque converter 18 (17 in automatic gear shifting). ,
The above-mentioned large amount of auxiliary air effectively suppresses a significant drop in engine speed, and stall is reliably prevented. Furthermore, during sudden deceleration from a high speed gear (for example, 4th gear), since the amount of auxiliary air is small at the beginning, the drive torque can be effectively reduced while responding well to the drop in engine speed. The deceleration effect is as expected and the driver's sense of deceleration is improved.Therefore, stalling during idling can be effectively prevented without reducing the sense of deceleration during sudden deceleration. .

In the above embodiment, the automatic transmission 1117 has four forward speeds, but it is of course possible to use the automatic transmission 1117 with three forward speeds. It can also be applied to engines.

(Effects of the Invention) As explained above, according to the engine intake system of the present invention, during deceleration operation, auxiliary air is gradually supplied to the engine as the automatic transmission automatically switches to a lower gear. This makes it possible to effectively prevent a stall by compensating for the drop in drive torque applied to the torque converter of the automatic transmission during idling operation, without impairing the feeling of deceleration during sudden deceleration. It is something.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Figures 2 to 4 show embodiments of the present invention, with Figure 2 being a general schematic diagram, Figure 3 being a flowchart showing the operation of the controller, and Figure 4 being a diagram showing the operation of the controller according to the gear position of the automatic transmission. FIG. 3 is an explanatory diagram showing auxiliary air amount characteristics. DESCRIPTION OF SYMBOLS 1... Rotary engine, 6... Eccentric shaft, 11... Intake passage, 17... Automatic transmission, 18... Torque converter, 20... Speed change 'R@
, 22... bypass passage, 23... control valve, 24...
... Auxiliary air supply means, 32 ... Gear position sensor, 33
... Controller, 34... Deceleration operation detection means,
35... Control means, 36... Correction means. Patent applicant Mazda Motor Corporation Figure 4 Figure 1 Figure 3

Claims (1)

[Claims] (1) An intake system for an engine connected to an automatic transmission with a built-in torque converter on the output shaft, which includes deceleration detection means for detecting when the engine is decelerating, and an auxiliary air supply supplying auxiliary air to the engine. and a control means for controlling the auxiliary air supply means to supply auxiliary air to the engine when the deceleration operation detecting means detects the deceleration operation, and a speed change for detecting a gear position of the automatic transmission. A gear detecting means; and a correcting means that receives the output of the gear detecting means and corrects the control of the auxiliary air supply means by the control means so that the amount of auxiliary air to the engine is increased as the gear becomes lower. An engine intake system characterized by: