JP3339126B2 - Idle rotation speed control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission (AT), and more particularly to an idle speed control of a vehicle using the automatic transmission.

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field, the discharge amount of hydraulic oil (ATF) supplied to each part of an automatic transmission (AT) is determined by the discharge capacity of an oil pump directly connected to an engine. Are known. If the desired discharge amount has not been generated, the engine speed NE is increased. For example, Japanese Patent Application Laid-Open Nos. 4-321742 and 4-203224 disclose that, in order to reduce the size of an oil pump that supplies hydraulic oil to an automatic transmission, when the temperature of hydraulic oil is high, the leakage flow rate increases. As a means for solving the demand for an increase in the discharge amount accompanying the above, a technique for increasing the idle speed NE in accordance with the hydraulic oil temperature is described.

[0003]

However, the prior art cannot solve the following problems when the cause is not related to the operating oil temperature of the automatic transmission, such as a decrease in pump capacity due to aging. In recent years, in order to improve the fuel efficiency at the time of idling, not only the small size of the oil pump but also the technology of lowering the idle speed has been advanced. By the way, the operating oil of the clutch is also supplied from the oil pump directly connected to the engine, and when the idle speed NE decreases, the discharge amount of the oil pump directly connected to the engine that generates the operating oil pressure of the automatic transmission decreases. Therefore, there is a problem that the supply pressure of the hydraulic oil to the clutch becomes insufficient and the clutch may be slipped. There is also a problem that the clutch slips when the oil temperature is high or when the pump capacity is reduced due to a change over time.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a control device for an automatic transmission which can control the discharge amount of an oil pump so that clutch slip does not occur in any state.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an idle speed control apparatus for changing and setting an idle speed of an engine according to a driving condition of a vehicle. Input / output shaft rotation speed means for detecting the input / output shaft rotation speed. From the input / output shaft rotation speed, slippage of a clutch receiving supply of hydraulic oil from an oil pump directly connected to the engine is detected, and if there is slippage of the clutch, the idle rotation speed is set to be high. Further, the slippage of the clutch is determined when the vehicle is stopped in the travel range, the engine speed is such that overrun does not occur at the time of starting, and the input shaft rotation speed of the automatic transmission is generated. Done in

[0006]

According to the idle speed control device of the present invention,
From the input / output shaft rotation speed, the presence / absence of slippage of a clutch that receives supply of hydraulic oil from an oil pump directly connected to the engine is detected, and if there is slippage of the clutch, the idle rotation speed is set to be high, As the engine speed increases, the discharge of the hydraulic oil from the oil pump increases, so that the supply shortage of the hydraulic oil to the clutch is eliminated, and slippage of the clutch can be prevented. Further, it is possible to prevent the clutch from slipping due to a decrease in the pump capacity for supplying the hydraulic oil of the automatic transmission due to a high oil temperature or a change with time.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an overall outline of an automatic transmission combined with an electronic fuel injection engine for an automobile of an intake air amount detection type according to an embodiment of the present invention. As shown in the figure, the air sucked from the air cleaner 10 is sequentially sent to an air flow meter 12, an intake throttle valve 14, a surge tank 16, and an intake manifold 18. This air is mixed with fuel injected from the injector 22 near the intake port 20, and is further sent to the combustion chamber 26 A of the engine main body 26 via the intake valve 24. The exhaust gas generated as a result of the combustion of the air-fuel mixture in the combustion chamber 26A is:
The gas is discharged to the atmosphere via an exhaust valve 28, an exhaust port 30, an exhaust manifold 32, and an exhaust pipe (not shown).

The air flow meter 12 is provided with an intake air temperature sensor 100 for detecting the intake air temperature.
Further, the exhaust manifold 32 is provided with an exhaust gas temperature sensor 101 for detecting the exhaust gas temperature of the engine. The intake throttle valve 14 rotates in conjunction with an accelerator pedal (not shown) provided in a driver's seat. The intake throttle valve 14 is provided with a throttle sensor 102 for detecting its longitude. Further, a water temperature sensor 104 for detecting an engine cooling water temperature is provided in the cylinder block 26B of the engine body 26. Further, the distributor 38 having an axis rotated by the crankshaft of the engine body 26 is provided with a crank angle sensor 108 for detecting a crank angle from the rotation of the shaft, from which the engine rotation speed is detected. It has become so. Further, an automatic transmission (hereinafter referred to as E) combined with an electronic fuel injection engine for automobiles.
CT), a vehicle speed sensor 110 for detecting the vehicle speed from the rotational speed N0 of the output shaft, a C0 sensor 113 for detecting the rotational speed of the clutch C0, a shift position sensor 112 for detecting the shift position, and an automatic A sensor 111 for detecting the oil temperature in the oil pan of the transmission is provided.

These sensors 100, 101, 10
2, 104, 108, 110, 111, 112, 113
Output and pattern select switch 114, overdrive switch 116, brake lamp switch 11
The output of 8 is input to the engine computer 40 or the ECT computer 50. Engine computer 40
Then, the fuel injection amount and the optimal ignition timing are calculated using the input signals from the sensors as parameters, and the injector 2 is configured to inject the fuel for a predetermined time corresponding to the fuel injection amount.
2 and the ignition coil 44 so as to obtain the optimum ignition timing.

An idle rotation speed control valve 42 driven by a step motor is provided in a bypass passage that connects the upstream of the intake throttle valve 14 and the surge tank 16. The engine computer 40 has the ECT
By receiving the oil temperature information of the automatic transmission from the computer 50 and controlling the idle speed control valve 42, the idle speed of the engine is controlled in consideration of the oil temperature of the automatic transmission in addition to various parameters.

On the other hand, the transmission unit 900 of the ECT in this embodiment includes a torque converter 910,
An overdrive mechanism 920 and an underdrive mechanism 930 are provided. The torque converter 910 is a well-known type including a pump 911, a turbine 912, and a stator 913, and includes a lock-up clutch 914.

The overdrive mechanism 920 includes a planetary gear set including a sun gear 921, a carrier 923 supporting a planetary pinion 922 meshing with the sun gear 921, and a ring gear 924 meshing with the planetary pinion 922. The rotational state of the device is controlled by the clutch C0, the brake B0, and the one-way clutch F0.

The underdrive mechanism 930 includes a common sun gear 931, planetary pinions 932 and 933 meshing with the sun gear 931, and the planetary pinion 9.
A ring gear 93 having carriers 934 and 935 for supporting the shafts 32 and 933 and planetary pinions 932 and 933;
6 and 937. The planetary gear set includes two sets of clutches C1, C2, brakes B1, B2.
2 and one-way clutches F1 and F2. Since this transmission unit 900 is known per se, the connection state of each component is only shown in the skeleton in FIG. 1 and detailed description is omitted.

The ECT in this embodiment is provided with the transmission unit 900 as described above, and the ECT computer 50 to which signals from the throttle sensor 102, the vehicle speed sensor 110, the C0 sensor 113, etc. are input, sets a predetermined shift. The solenoid valves S1 to S4 in the hydraulic control circuit 60 are driven and controlled in accordance with the pattern, and the clutches, brakes, and other engagements are combined to perform shift control.

FIG. 2 shows the basic configuration of the present invention,
FIG. 4 is a diagram showing an idle rotation speed control device 501 provided in the computer 50. The idle rotation speed control device 501 shown in the figure is provided in the ECT computer 50 and changes and sets the idle rotation speed of the engine according to the operating state. The AT input shaft rotation sensor for detecting the input / output shaft rotation speed of the automatic transmission provided in the transmission unit 900 in order to add a function of judging a shortage of the discharge amount of the oil pump and increasing the engine idle speed. In addition to the input of the rotation speed of the AT 151 and the AT output shaft rotation sensor 152, information such as the brake, the range position, and the engine speed is input, and the idle speed control (IS) of the engines 26 and 40 is performed by the configuration and operation described below.
The control signal of C) is formed.

FIG. 3 shows an idle speed control device 5 shown in FIG.
FIG. 2 is a diagram showing a configuration of the first embodiment. The idle speed control device 501 shown in the figure receives the engine speed, the AT input shaft speed, the AT output shaft speed, the range position, and the brake SW from various sensors, and the vehicle is stopped in the travel (D) range. D range stop determination means 1 for determining that the clutch is slipping, clutch slip detection means 2 for determining that the clutch is slipping, target idle speed calculation means 3 for calculating a target idle speed, and change of idle speed And idling rotation changing means 4 for instructing the rotation.

FIG. 4 is a flowchart for explaining the control operation of the idle rotation speed control device 501. As shown in the figure, the D-range stopped-state determining means 1 performs the processing from steps S1 to S6. In step S1, the AT output shaft speed NO is input. In step S2, the brake S
W: Input the state of BRK.

In step S3, a range position: NSW is input. In step S4, "the rotational speed NO = 0"
? Is determined. In step S5, "the BRK is O
N? Is determined. In step S6, "running range?" Is determined. In the clutch slip detecting means 2, if the above steps S1 to S6 are all affirmative, that is, if it is determined that the vehicle is stopped in the traveling range, the following step S7 is performed.
To S10.

In step S7, the engine speed NE is detected. In step S8, the engine speed NE is not greater than or equal to the predetermined value NEmax, that is, "NE> N
It is determined that it is not “Emax”. This predetermined value NEma
x is set to such an extent that the idling speed is not too high and overrun does not occur at the start.

In step S9, the AT input shaft speed NI
Enter In step S10, "the rotational speed NI> 0
? Is determined. If this is the case, it is determined that the clutch has slipped. When the clutch is completely engaged, it is in a state directly connected to the tire, and the rotation speed N
Since I = 0, the presence or absence of slip can be determined.

In step S11, step S10
If the determination in step (3) is affirmative, ISC (idle speed control) is performed by the target idle speed calculating means 3.
In order to increase the idle target rotational speed MISC, the following calculation for adding the set value by α is performed to update the target rotational speed. MISC = MISC + α In step S12, the idle speed change instructing means 4 issues an instruction to change to the updated target speed.

When the determinations in steps S4, S5, and S6 are negative, when the determination in step S8 is positive, and when the determination in step 10 is negative, the above determination and calculation are performed. Return to the main routine without performing. The engine speed can be increased by throttle control instead of the idle speed control.

[0023]

As described above, according to the present invention, the presence / absence of slippage of the clutch which receives the supply of hydraulic oil from the oil pump directly connected to the engine is detected from the rotational speed of the input / output shaft, and the slippage of the clutch is detected. In this case, since the idle rotation speed is set to be high, the engine rotation speed is increased, and the discharge amount of the operating oil of the oil pump is increased, so that the supply shortage of the operating oil of the clutch is eliminated, and the slip of the clutch can be prevented. Further, it is possible to prevent the clutch from slipping due to a decrease in the pump capacity for supplying the operating oil of the automatic transmission due to a high oil temperature or a change with time.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall outline of an automatic transmission combined with an electronic fuel injection engine for an automobile of an intake air amount-related type according to an embodiment of the present invention.

FIG. 2 is a diagram showing an idle rotation control device 501 provided in the ECT computer 50 and having a basic configuration according to the present invention.

FIG. 3 is a diagram showing a configuration of an idle rotation speed control device 501 of FIG. 2;

FIG. 4 is a flowchart illustrating a control operation of an idle rotation speed control device 501;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Running range stop determination means 2 ... Clutch slip detection means 3 ... Target idle rotation speed calculation means 4 ... Idle rotation change instruction means 26 ... Engine 40 ... Engine computer 50 ... ECT computer 501 ... Idle rotation speed control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02D 29/00-29/06 F02D 41/00-41/40 B60K 41/00-41/28

Claims (2)

(57) [Claims] 1. An idle speed control device for changing and setting an idle speed of an engine according to a driving state of a vehicle, comprising an input / output shaft speed means for detecting an input / output shaft speed of an automatic transmission. From the input / output shaft rotation speed, a slip of a clutch that receives supply of hydraulic oil from an oil pump directly connected to an engine is detected, and if there is slip of the clutch, an idle rotation speed is set to be high. Idle speed control device. 2. The method according to claim 1, wherein the clutch is determined to have slipped.
The method according to claim 1, wherein the stop is performed in a traveling range, when the engine speed is such that an overrun does not occur at the time of starting, and when the input shaft rotation speed of the automatic transmission is generated. 2. The idle speed control device according to claim 1.