JPH0326855A - Controller for engine - Google Patents

Abstract

PURPOSE:To reduce the torque adjusting manhour by obtaining the viscosity coefficient corresponding to the oil temperature from a physical property value memorizing means and obtaining the mechanical resistance torque corresponding to the engine revolution speed from the characteristic value memorizing means and controlling a torque adjusting means. CONSTITUTION:A torque adjusting means 41 is controlled by a control means 44 on the basis of the oil temperature detected by the hydraulic sensors 33 and 34 and the engine revolution speed detected by a revolution sensor 31. In this case, the viscosity coefficient corresponding to the oil temperature is obtained by a physical property value memorizing means 42, and the mechanical resistance torque corresponding to the engine revolution speed is obtained by a characteristic value memorizing means 43, and further, the mechanical resistance torque corresponding to the oil temperature is calculated from the viscosity coefficient and the mechanical resistance torque, and the engine torque is adjusted on the basis of the mechanical resistance torque. Therefore, the torque control for an engine can be carried out easily, and the manhour for fitness and development can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine control device, and particularly to one that adjusts engine torque in accordance with the engine's mechanical resistance torque.

(Prior Art) Conventionally, as disclosed in Japanese Patent Laid-Open No. 58-190572, for example, as a torque control device for an engine, a bypass passage that bypasses a throttle valve is provided in an intake passage, and a control valve is provided in the bypass passage. During idling operation, when the throttle valve is closed, when the engine is under load due to turning on the air conditioner, etc., the opening of the control valve is increased to increase the amount of intake air, increasing the engine torque and idling. A device that maintains the rotational speed is known.

(Problems to be Solved by the Invention) Generally, the mechanical resistance torque of an engine fluctuates depending on the temperature of engine oil and cooling water.

Therefore, the engine is equipped with the above-mentioned bypass passage and control valve, and the opening degree of the control valve is adjusted according to the engine oil temperature and cooling water temperature to adjust the engine torque and accurately adjust the idle speed. It is possible to maintain the target rotation speed. In that case, the torque control device should prepare a map in advance that sets the amount of air passing through the bypass passage (control valve opening degree) in correspondence with the engine oil temperature and cooling water temperature, and refer to this map. The amount of air passing through the bypass passage according to the current oil temperature and cooling water temperature (
The control valve opening degree) is determined and the control valve is adjusted with this as the target.

However, in that case, in order to create the above map, it is necessary to perform adaptation work such as setting various oil and cooling water temperatures and experimentally determining the amount of air passing through the bypass passage under those conditions. The number of man-hours required for compliance increases due to the need to use equipment.

Furthermore, if the load torque applied to the engine fluctuates and the target rotational speed changes, it is necessary to vary the amount of air passing through the bypass passage even if the oil temperature and cooling water temperature are the same. Therefore, it is necessary to prepare a plurality of maps that set the amount of air passing through the bypass passage with respect to oil temperature and cooling water temperature for each expected load torque, which increases the number of development steps.

The present invention has been made with attention to these points,
The purpose of this is to obtain a map of the engine's mechanical resistance experimentally using only the engine speed as a parameter, and to understand the fluctuations in the engine's mechanical resistance due to oil temperature and cooling water temperature based on the existing oil-specific physical property values. The purpose is to easily control engine torque by determining it using a map.

(Means for Solving the Problem) In order to achieve the above object, the present invention uses data on the viscosity coefficient with respect to engine oil temperature and data on mechanical resistance torque with respect to engine speed under standard oil temperature conditions. Based on this, determine the viscosity coefficient according to the oil temperature and the mechanical resistance torque according to the engine speed, calculate the mechanical resistance torque according to the oil temperature from these, and adjust the engine torque based on this mechanical resistance torque. That's what I do.

Specifically, the solution taken by the present invention is as shown in FIG.
, a physical property value storage means 42 that stores data on the viscosity coefficient with respect to engine oil temperature, a characteristic value storage means 43 that stores data on mechanical resistance torque with respect to engine speed under standard oil temperature conditions, Oil temperature detection means 33 for detecting a signal related to oil temperature.
34, and rotation speed detection means 3 for detecting the rotation speed of the engine.
1, the outputs of the oil temperature detection means 33, 34 and the rotational speed detection means 31 are received, and the viscosity coefficient corresponding to the oil temperature is stored in the physical property value storage means 42, and the viscosity coefficient corresponding to the engine rotational speed is stored in the characteristic value storage means 43. Find the resistance torque for each,
A control means 44 is provided for determining a mechanical resistance torque corresponding to the oil temperature from this viscosity coefficient and mechanical resistance torque, and controlling the torque adjusting means 41 based on this mechanical resistance torque.

(Function) With the above configuration, in the present invention, the oil temperature detection means 3
3. Based on the signal related to the oil temperature detected in step 34 and the engine rotation speed detected by the rotation speed detection means 31, the torque adjustment means 41 is controlled by the control means 44, and the oil is stored in the physical property value storage means 42. The viscosity coefficient corresponding to the temperature and the mechanical resistance torque corresponding to the engine speed are obtained from the characteristic value storage means 43, and the mechanical resistance torque corresponding to the oil temperature is obtained from the viscosity coefficient and the mechanical resistance torque. The engine torque is adjusted based on the mapped resistance torque.

In that case, the data to be stored in the characteristic value storage means 43 is
This data was obtained by measuring under constant temperature conditions called standard oil temperature conditions. Moreover, the data stored in the physical property value storage means 42 are already obtained physical property values specific to oil. Therefore, it is possible to obtain an arbitrary mechanical resistance torque and perform torque control while reducing the number of adaptation steps and development steps.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an engine equipped with a control device according to an embodiment of the invention. In the figure, 1 is a cylinder block, 2 is a cylinder head disposed on the cylinder block 1, the cylinder block 1 and the cylinder head 2 form a cylinder 3, and the cylinder 3 has a piston 4. A combustion chamber 5 is formed above the cylinder 3 by being slidably inserted therein.

The cylinder head 2 is provided with an ignition plug 6 facing the combustion chamber 5. 7 is an ignition coil for generating a secondary voltage. A distributor 8 is provided to be driven by the engine output shaft and is connected to the ignition coil 7 and the spark plug 6, and supplies the secondary voltage from the ignition coil 7 to the spark plug. It is divided into 6 parts.

An intake passage 10 is connected to the combustion chamber 5, and the intake passage 10 is opened to the atmosphere via an air cleaner (not shown). An intake valve 11 is provided at the opening of the intake passage 10 to the combustion chamber 5, and intake air is introduced into the combustion chamber 5 at a predetermined timing. The intake passage 10 also includes a throttle valve 12 for adjusting the intake flow rate.
is provided. Further, the intake passage 10 is provided with a bypass passage 13 that bypasses the throttle valve 12, and the bypass passage 13 is provided with an ISC valve 1.
4 are provided. This bypass passage 13 and IS
The C valve 14 functions as a torque adjustment means 41 that adjusts the torque of the engine.

Further, an injector 15 is provided at the end of the intake passage 10 on the combustion chamber side to inject fuel into the intake air.

An exhaust passage 20 is connected to the combustion chamber 5, and the exhaust passage 20 is open to the atmosphere. An exhaust valve 21 is provided at the opening of the exhaust passage 20 to the combustion chamber 5, and exhaust gas is led out from the combustion chamber 5 at a predetermined timing. Further, the exhaust passage 20 is provided with a catalyst 22 for purifying the exhaust gas.

Further, a known automatic transmission is connected to the engine. The transmission has N, P, L, S, D, and R range positions. Hereinafter, for convenience, the N and P ranges α position will be referred to as the N range, and the L, S, D, and R range positions will be referred to as the D range.

The operation of the ISC valve 14 and injector 15 is controlled by a control unit 30, and an ignition signal is sent from the control unit 30 to the ignition coil 7 at a predetermined timing.

Furthermore, 31 is a rotation speed sensor as a rotation speed detection means for detecting the engine rotation speed, 32 is a hot wire air flow meter provided in the intake passage 10 and used to detect the intake air flow rate, 33 is provided in the oil van of the engine, An oil temperature sensor 34 for detecting the temperature of the oil is provided in the cooling water passage of the engine and is a water temperature sensor for detecting the temperature of the cooling water. It functions as an oil temperature detection means for detecting a signal related to the oil temperature. Further, 35 is a crank angle sensor provided in the distributor 8 for detecting the crank angle. Output signals from each of these sensors are input to the control unit 30.

Next, the control of the control unit 30 will be explained based on the flow shown in FIG. 3. In the figure, after a start, the engine water temperature thw is manually measured in step S1, and it is determined in step S2 whether the transmission is in the N range. When it is in the N range, the target rotation speed no is set to "nomsipol (TIN
ON, thW)", and the process proceeds to step S5. Here, TINON is a table in which the target rotation speed no is set for the engine water temperature thw, and the function sipOl is used to compensate between the values in the table, as shown in FIG. This is an interpolation function for open calculation.On the other hand, when in the D range, the target rotation speed no is set to 'no-sipol' in step S4.
(TINOA, thw)' and proceeds to step S5. Here, TINOA is a table in which target rotational speed no is set for engine water temperature thw. The relationship between the engine water temperature thw and the target rotational speed no obtained by this compensation calculation is as shown in FIG.

Next, in step S5, the mechanical resistance torque to under standard oil temperature conditions is expressed as 'tosipol' (Table 2,
No.)'. Here, table 2 is a table in which mechanical resistance torque to is set for target rotation speed no. The relationship between the target rotational speed no and the machine resistance torque to based on this compensation calculation is as shown in No. 6r14.

Also, in step S6, the engine oil temperature tho is input, and in step S7, the viscosity coefficient mu at an arbitrary temperature is calculated as "
mu-sipol (table 1, tho)". Here, table 1 is a table in which the viscosity coefficient mu is set for the oil temperature tho. The relationship between the oil temperature tho and the viscosity coefficient mu by this compensation calculation is as follows. As shown in Fig. 7. Then, in step S8, the mechanical resistance torque tfr at an arbitrary oil temperature is calculated as "tfr-toX
mu/KMUO", where KMUO is the viscosity coefficient under standard oil temperature conditions.

Furthermore, in step S9, the basic filling efficiency Ceb is set to "Ceb
-si po 1 (TICE, t fr)'
Find it by Here, TICE is a table in which basic filling efficiency Ceb is set with respect to mechanical resistance torque tfr at an arbitrary oil temperature. Then, in step Sl1, the air amount qisc passing through the bypass passage 13 is determined as "qisc".
- Determine by CebXno/ksa and return. Here, ksa is a conversion coefficient for converting filling efficiency into air amount.

In the above flow, Table 1 referred to in step S7 constitutes the physical property value storage means 42 that stores data on the viscosity coefficient with respect to the temperature of engine oil. Further, the table 2 referred to in step SS constitutes a characteristic value storage means 43 that stores data on mechanical resistance torque with respect to engine speed under standard oil temperature conditions. Further, in steps S1 to SIO, the oil temperature detection means 33, 34 and the rotation speed detection means 3
1, the viscosity coefficient corresponding to the oil temperature is obtained from the physical property value storage means 42, and the mechanical resistance torque corresponding to the engine rotation speed is obtained from the characteristic value storage means 4 and 3, and the viscosity coefficient and mechanical resistance torque are obtained. A control means 44 is provided which determines a mechanical resistance torque corresponding to the oil temperature and controls the torque adjustment means 41 based on this mechanical resistance torque.

Therefore, in the above embodiment, the oil temperature sensor 33,
The torque adjustment means 41 is controlled by the control means 44 based on the signal related to the oil temperature detected by the water temperature sensor 34 (oil temperature detection means) and the engine rotation speed detected by the rotation speed sensor 31 (rotation speed detection means). The viscosity coefficient according to the oil temperature is stored in table 2 (characteristic value storage means) 4 from table 1 (physical property value storage means) 42 under control.
3, the mechanical resistance torque corresponding to the engine speed is determined, and from this viscosity coefficient and mechanical resistance torque, the mechanical resistance torque corresponding to the oil temperature is determined, and the engine torque is adjusted based on this mechanical resistance torque. .

In this case, the data to be stored in the table 2 (characteristic value storage means) 43 is data obtained by determining the DI under constant temperature conditions of standard oil temperature conditions. Moreover, the data stored in table 1 (physical property value storage means) 42 is
These are physical property values unique to existing oils. Therefore, it is possible to obtain an arbitrary mechanical resistance torque and perform torque control while reducing the number of adaptation steps and development steps.

In the above embodiment, the engine is equipped with the bypass passage 13 and the ISC valve, and the torque adjustment means 41 is constituted by the bypass passage 13 and the ISC valve 14, but the present invention is not limited to this. . for example,
Without providing the bypass passage 13 and ISC valve 14, the ignition timing can be adjusted to 5! The torque adjustment means may be configured to adjust the engine torque using a regulating means, or the torque adjustment means may be configured to adjust the engine torque by adjusting the amount of fuel injected from the injector 15.

(Effects of the Invention) As explained above, according to the engine control device of the present invention, the torque that adjusts the engine torque. $! ! lI
physical property value storage means that stores data on viscosity coefficient with respect to engine oil temperature; and characteristic value storage means that stores data on mechanical resistance torque with respect to engine speed under standard oil temperature conditions. A viscosity coefficient corresponding to the oil temperature is determined from the value storage means, a mechanical resistance torque corresponding to the engine rotation speed is determined from the characteristic value storage means, and a mechanical resistance torque corresponding to the oil temperature is determined from the viscosity coefficient and the mechanical resistance torque. Since the torque adjustment means is controlled based on this mechanical resistance torque,
Based on data obtained by measurements under constant temperature conditions (standard oil temperature conditions) and existing oil-specific physical property values, an arbitrary mechanical resistance torque can be determined while reducing adaptation and development man-hours. can be controlled.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 7 illustrate embodiments of the present invention, FIG. 2 is an overall schematic diagram, FIG. 3 is a flowchart showing control of the control unit, and FIG. 4 is a characteristic showing characteristics of interpolation calculation. Figure 5 is a characteristic diagram showing the relationship between engine water temperature and target rotation speed, Figure 6 is a characteristic diagram showing the relationship between target rotation speed and mechanical resistance torque, and Figure 7 is a characteristic diagram showing the relationship between oil temperature and viscosity coefficient. It is a characteristic diagram showing a relationship. 31... Rotation speed sensor (rotation speed detection means) 33...
Oil temperature sensor (oil temperature detection means) 34... Water temperature sensor (oil temperature detection means) 41... Torque adjustment means 42... Physical property value storage means 43... Characteristic value storage means 44... Control means 31... Rotation speed sensor (rotation speed detection means) 33...
/lt] Temperature sensor (oil temperature detection means) 34...Water temperature sensor (oil temperature detection means) 41...Torque adjustment means 42...Physical property value storage means 43...Specific value storage means 44... Control means Fig. 1 Fig. 3 Fig. 5 Fig. 6 Fig. 7 Fig. 4

Claims (1)

[Claims] (1) Torque adjustment means for adjusting engine torque;
Physical property value storage means that stores data on viscosity coefficient with respect to engine oil temperature; characteristic value storage means that stores data on mechanical resistance torque with respect to engine speed under standard oil temperature conditions; and characteristic value storage means that stores data on mechanical resistance torque with respect to engine oil temperature. an oil temperature detection means for detecting a signal to be detected; a rotation speed detection means for detecting the rotation speed of the engine; The mechanical resistance torque corresponding to the engine speed is determined from the characteristic value storage means, the mechanical resistance torque corresponding to the oil temperature is determined from the viscosity coefficient and the mechanical resistance torque, and the above-mentioned torque is adjusted based on this mechanical resistance torque. 1. A control device for an engine, comprising: a control means for controlling the engine.