JPS6243327A - Warming controller for engine - Google Patents

Abstract

PURPOSE:To improve drivability by installing a revolution regulating means which regulates the revolution on the turbine side of a torque converter and operating the revolution regulating means when the shift position of a transmission is in neutral range or parking range in warming operation state. CONSTITUTION:A controller 25 controls a control valve 26, brake operating actuator 16, etc., and in the bypass air control by the control valve 26, the aimed idle revolution speed is set higher than that in the ordinary case for a prescribed time after the start in the case when the engine is cold, and warming is accelerated. In said warming operation the shift position of a transmission 2 is set into P or N range, and the warming operation is carried out when the engine temperature is below a prescribed value, and the revolution on the turbine side of a torque converter 3 operating a brake 17 is regulated by the actuator 16. Therefore, increase of the engine revolution speed is suppressed, and the generation of noise and vibration in warming can be prevented.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an engine warm-up control device.

(Prior art) In automobile engines equipped with an exhaust purification device such as a catalytic converter in the exhaust system, the temperature of the catalytic converter is low and sufficient exhaust purification performance cannot be obtained, especially when the engine is cold. It is necessary to accelerate the warm-up action of the engine and rapidly warm up the catalytic converter to activate it. Specific methods for this include, for example, as disclosed in JP-A-55-123336. During warm-up operation, the amount of intake air is increased by a predetermined amount compared to during normal idling operation, and the engine's target idle speed is set higher, thereby increasing the amount of combustion gas that contributes to the warm-up effect. There is something.

However, in a warm-up control device that increases the amount of intake air during warm-up and sets the engine idle speed higher than normal idle speed, the engine speed during warm-up Due to the high number of motors, there were problems with large noise and vibration during warm-up and poor driving feeling.

(Objective of the Invention) The present invention is an attempt to improve the problems pointed out in the above-mentioned section of the prior art. The purpose is to provide a machine control device.

(Means for Achieving the Object) As a means for achieving the above object, the present invention includes a transmission mechanism having a torque converter in the engine output transmission system, and furthermore, the present invention includes at least an increase correction of the intake air amount during warm-up operation. The engine is configured to perform warm-up control including a rotation regulating means for regulating the rotation of the turbine side of the torque converter, and the engine is in the warm-up operating state, and the automatic transmission is in the shift position. The rotation regulating means is configured to operate when the vehicle is in the neutral range or parking range.

(Function) According to the present invention, when the engine is warmed up, the amount of combustion gas is increased by increasing the amount of intake air and the warm-up action is promoted, and the rotation regulating means is used to increase the amount of combustion gas on the turbine side of the torque converter. Since the rotation of the engine is regulated, an appropriate load is applied to the torque converter, and as a result, an increase in the engine speed based on the correction to increase the amount of intake air is suppressed.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 3.

(Pole! Embodiment) (Configuration) FIG. 1 shows the entire system of a four-cylinder automobile engine with an automatic transmission equipped with a warm-up control device according to a first embodiment of the present invention. In the figure, reference numeral 1 indicates an engine, and 2 indicates an automatic transmission, which will be described in detail later. An air cleaner 7, an air flow meter 8, and a throttle valve 9 are sequentially provided in the intake passage 6 of the engine 1. A bypass air passage 10 of the intake passage 6 that bypasses the throttle valve 9 is provided with a control valve 26 that receives a control signal from a controller 25 and adjusts the amount of bypass air.

Further, at the most downstream end of this intake passage 6, injectors 19, 19, . . . are provided for each cylinder. This injector 19.19... is connected to the controller 25
Its operation is controlled in response to control signals from.

Furthermore, this controller 25 includes a rotation speed sensor 11.
The engine rotation speed signal is sent from the water temperature sensor 12, the engine temperature (cooling water temperature) signal is sent from the throttle opening sensor 18, and the engine temperature (cooling water temperature) signal is sent from the water temperature sensor 12 to the throttle opening sensor 18.
A throttle opening signal from the air flow meter 8, an intake air amount signal from the air flow meter 8, and an engine starting signal from the starting sensor 13 are input as engine state detection signals.

Further, in FIG. 1, reference numeral 16 denotes a brake actuator, and this brake actuator 1
6 receives a control signal from the controller 25 and operates to forcibly turn on the foot brake 17 of the automobile without the driver's depression operation.

The automatic transmission 2 is an automatic transmission having a conventionally known structure, and includes a torque converter 3 as shown in FIGS. 1 and 2.
and a transmission mechanism 4.

Torque converter 3 includes a pump 31 driven by engine 1, a turbine 32 connected to input shaft 21, and a stator 33 located between pump 31 and turbine 32.

The transmission mechanism 4 is an overdrive planetary gear transmission mechanism 35.
and a multi-gear transmission mechanism 36, four clutches: a direct clutch 41, a front clutch 43, a rear clutch 45, and a one-way clutch 47, an overdrive brake 42, a second brake 44, and a low reverse brake 46. brakes, intermediate shaft 22 and output shaft 23
By appropriately activating or deactivating these clutches and brakes by a mission control section 20 (see Fig. 1) each having a hydraulic circuit, a predetermined gear position between 1st and 4th speeds can be obtained. It is now possible to The mission control unit 20 is controlled by a control signal from the controller 25. Furthermore, the shift settings of the automatic transmission 2 are controlled by the mission control unit 2 using the shift lever device 15.
This is done by operating a manual valve (not shown) in 0, and depending on the lever position of the shift lever device 15, P (parking range), R (reverse range), N (neutral range), D (drive range) ,
! A total of six ranges are selectively set: (automatic shift between 1st and 4th speeds), 2nd range (fixed at 2nd speed), and Lunge (automatically shifts between 1st and 2nd speeds). Note that this shift position is detected by the shift lever position sensor 14.

The operating state of each element of the transmission mechanism 4 at each shift position is shown in Table 1, which is provided separately.

(Operation and Effects thereof) The controller 25 receives detection signals from the various sensors described above and controls the injectors 19, 19, . . . , the control valve 26, the brake actuator 16, and the mission control section 20, respectively. In this embodiment, each of the control elements described above is controlled according to the following control pattern.

First, fuel control is performed via the injector 19, and this fuel control determines the fuel injection amount and injection timing based on the intake air amount signal input from the air flow meter 8 and the engine rotation speed signal input from the rotation speed sensor 11. This is done by calculating the valve opening timing and valve opening time of the injector 19.

Bypass air control by the control valve 26, that is, engine idle speed control, is basically controlled according to the deviation between a predetermined target idle speed and the current idle speed input from the speed sensor 11. This is achieved by adjusting the opening degree of the valve 26, but especially when the engine is cold (that is, when the engine cooling water temperature detected by the water temperature sensor 12 is below a predetermined temperature), the engine starting Afterwards (starting of the engine is detected by the start sensor 13), the target idle speed is set to be higher than the normal (engine warm-up state) value by a predetermined amount for a predetermined period of time (starting of the engine is detected by the start sensor 13), and the amount of bypass air is increased to start combustion. Control is performed to increase the amount of gas and thereby promote the warming effect.

Therefore, in this case, if the engine 1 is in a no-load operating state, the engine speed will rise above the target idle speed during normal operation, and the warm-up noise or vibration will increase accordingly. However, in this embodiment, this is prevented by operating the foot brake 17 using the brake actuator 16.

That is, since warm-up is performed when the shift position of the automatic transmission 2 is set to the P range or N range and the engine temperature is below the set value, the warm-up operation is first performed based on the shift position and engine water temperature. Determine machine operating status.

As a result of the determination, if the above conditions are not met, the state is at the time of restart after completion of warm-up, so in this case, the intake air amount is not increased and correction is performed, and normal idle rotation speed control is performed.

On the other hand, if the engine condition meets the above conditions, it is in a warm-up operation state, so the control valve 26 is controlled to correct the intake air amount increase, and at the same time the shift position is changed to P range or N range. The operation of controlling the mission control section 20 to set each element of the transmission mechanism 4 to the D range state and the operation of operating the foot brake 17 are performed in parallel. For example, when the rear clutch 45 is turned ON in the N range state to set the first speed state in the D range, the input shaft 21 and the output shaft 23 are connected and the car is ready to drive. The foot brake 17 is turned ON by the brake actuation actuator 16 to apply braking force to the automobile, and the automobile is maintained in a stopped state. Therefore, the rotation of the turbine 32 of the torque converter 3 is restricted, and a predetermined load is thereby applied to the engine 1. Therefore, the engine speed is suppressed from increasing regardless of the correction to increase the intake air amount by the control valve 26 as described above, and is maintained near the target idle speed during normal operation. That is, by doing so, the warming-up promoting effect by increasing the amount of combustion gas and the warming-up noise and vibration suppressing effect by keeping the engine speed low are simultaneously realized. In this embodiment, the brake actuator 16 and the foot brake 17 correspond to rotation regulating means in the claims.

(Second Embodiment) FIG. 3 shows a system diagram of an automobile engine equipped with a warm-up device according to a second embodiment of the present invention. The configurations of the engine 1 and the automatic transmission 2 are the same as those of the first embodiment, and the description thereof will be omitted here by assigning reference numerals corresponding to the respective members in FIG. 1.

The second embodiment is different from the first embodiment in that the brake actuator 16 and the foot brake 17 function as rotation regulating means as claimed in the claims. In contrast, the rotation of the turbine 32 of FIG. 3 is regulated to apply a predetermined load to the engine 1. On the other hand, each element of the transmission mechanism 4 shown in FIG. The locking action restricts the rotation of the turbine 32 of the torque converter 3, thereby applying a predetermined load to the engine 1. Two specific examples of this method will be explained below.

(First method) When the operating state of the engine meets the warm-up conditions described above, the overdrive brake 42 is turned ON while the shift position is maintained in the N range or the P range. In this way, the overdrive brake 42 stops the rotation of the intermediate shaft 22, which was being rotated by the rotational force transmitted from the turbine 32 via the input shaft 21 and the direct clutch 4I, so the turbine inevitably 32 will be regulated, and a predetermined load will be applied to the engine 1. In this case, the overdrive brake 42 functions as rotation regulating means in the claims.

(Second method) Whereas the first method causes the overdrive brake 42 to function as a rotation regulating means, the second method simultaneously turns on the front clutch 43 and the second brake 44. Let this front clutch 4
3 and the second brake 44 function as rotation regulating means.

In this way, when the front clutch 43 and the second brake 44 are turned ON in the P range or N range state, the torque is transmitted from the turbine 32 of the torque converter 3 to the front clutch 43 via the input shaft 2+ and the intermediate shaft 22. The rotation of the turbine 32 is stopped by the second brake 44, thereby regulating the rotation of the turbine 32, and a predetermined load is applied to the engine 1.

Therefore, in each method of the second embodiment, as in the case of the first embodiment, the warm-up effect is promoted by increasing the amount of combustion gas, and the warm-up noise is reduced by keeping the engine speed low. The effect of suppressing vibrations is also achieved at the same time.

(Effects of the Invention) The engine warm-up control device of the present invention is equipped with a transmission mechanism having a torque converter in the engine output transmission system, and is configured to perform warm-up control including at least correction to increase the amount of intake air during warm-up operation. The engine is provided with a rotation regulating means for regulating the rotation of the turbine side of the torque converter, and the engine is in a warm-up operating state, and the automatic transmission is in a neutral range or a parking range. The present invention is characterized in that the rotation restricting means is configured to operate when the rotation restriction means is activated.

Therefore, according to the engine warm-up control device of the present invention, during engine warm-up operation, (1) the amount of intake air to the engine is corrected to increase, and the amount of combustion gas is increased, so that the warm-up action is promoted; (2) Due to the rotation regulating action of the turbine side of the torque converter by the rotation regulating means, a load is applied to the torque converter, suppressing the increase in engine speed based on the correction to increase the amount of intake air, and reducing noise during warm-up. and an increase in vibration is prevented, etc. Therefore, the effect of simultaneously realizing an improvement in warm-up performance and an improvement in driving feeling can be obtained.

[Brief explanation of the drawing]

1 is a system diagram of a warm-up control device according to a first embodiment of the present invention, FIG. 2 is a skeleton diagram showing the configuration of the automatic transmission shown in FIG. 1, and FIG. 3 is a system diagram of a warm-up control device according to a first embodiment of the present invention. FIG. 2 is a system diagram of a warm-up control device according to a second embodiment. l...Engine 2...Automatic transmission 3...Torque converter 4...Transmission mechanism 5...Drive shaft 6...Intake passage 8. ... Air flow meter 9 ... Throttle valve IO ... Bypass air passage 2 ... Rotation speed sensor 12 ... Water temperature sensor 13 ... Start sensor 14 ... Shift lever -Position sensor I6...brake actuator 18...
- Throttle opening sensor 19... Injector 20... Mission control section 31... Pump 32... Turbine

Claims (1)

[Claims] 1. In an engine that is equipped with a transmission mechanism that includes a torque converter in the engine output transmission system, and that performs warm-up control that includes at least correction to increase the amount of intake air during warm-up operation, the rotation of the turbine side of the torque converter is controlled. The engine is equipped with a rotation regulating means, and is configured to operate the rotation regulating means when the engine is in a warm-up operating state and the automatic transmission is in a neutral range or a parking range. An engine warm-up control device characterized by: