JPS6357850A - Control device for engine load - Google Patents

Abstract

PURPOSE:To obtain a proper change of an engine speed, by obtaining a load adjusting amount from the target engine speed and the actual engine speed while a target load from a sum of this load adjusting amount and the basic load and controlling a throttle actuator. CONSTITUTION:While an engine is in operation, output signals of an engine speed sensor 11a, sensor 21b detecting the gear position of a transmission 20, car speed sensor 23, etc. are input to an electronic control unit 31. And said unit 31 first calculates the target engine speed on the basis of a car speed and a gear shift or the like after a speed change and obtains a load adjusting amount from a difference between said target engine speed and the actual engine speed. Next the unit 31, which obtains a target load amount from a sum of the basic load amount and the load adjusting amount obtained on the basis of the target engine speed, controls a throttle actuator 30 toward said target load amount changing the engine speed to the optimum value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine load control device for an electronically controlled vehicle.

(Prior Art) In an automatic vehicle that uses an automatic clutch and automatic transmission, for example, the correspondence between the throttle valve position of a gasoline engine and the engine speed is stored in the memory of an electronic control unit for each gear position of the transmission. , calculate the predicted engine speed after shifting rA, and use the correspondence relationship corresponding to the gear position l after the shifting operation of the running vehicle to correspond to the calculated predicted engine speed after shifting. The throttle valve position is determined, and the actual throttle valve position is controlled to the throttle valve position determined by the calculation to adjust the engine speed.
It has been proposed to obtain an appropriate change in engine speed by preventing the engine speed from decreasing and from dropping in the engine speed (see Japanese Patent Application Laid-open No. 8436/1983).

(Problem to be Solved by the Invention) However, in the above-mentioned throttle position control method, the engine speed is a predicted calculated value and does not take into account the actual engine speed (actual engine speed). Sometimes, when the actual engine speed changes, it may not be possible to respond to the change and perform a smooth gear change operation.

Therefore, an object of the present invention is to correct the E1 target load by the load increase/decrease determined by the difference between the target rotation speed and the actual rotation speed during gear shifting, so that even if the engine speed changes, the An object of the present invention is to provide an engine load control device that can smoothly perform a gear change operation in accordance with the present invention.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides means for determining a load increase/decrease based on the difference between a target engine speed and an actual engine speed, and a means for determining a load increase/decrease from a basic load and the load increase/decrease. An engine load control device is provided which includes means for determining a target load from the sum of the engine load and the target load, and controls an actuator to the target load.

(Operation) First, the vehicle speed, the gear position to be changed, and the actual engine speed are read. The target engine speed is calculated from the following equation.

Target engine speed = KX ((current vehicle speed x tire effective layer) / (gear ratio of gear after shifting x final reduction ratio)) Here, K is a coefficient using the target engine speed calculated from the above formula and the graph ( The basic load amount is determined from the data map). 11 The load increase/decrease ja: is determined from the graph (data map) based on the difference between the standard engine rotation speed and the actual engine rotation speed. A target load (step of the step motor) is determined from the sum of the basic load amount and the load increase/decrease, and the throttle actuator is operated toward the target load to drive the engine speed to the optimum speed.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a schematic configuration diagram of the engine load control bag of the present invention, Fig. 2 is a graph showing the relationship between target engine speed and basic load -1, and Fig. 3 is a graph showing the relationship between target engine speed and actual engine speed. FIG. 4 is a graph showing the relationship between the difference in load and the stoppage of load increase/decrease, and is a flowchart of control according to the present invention.

In m1lN, 11 is the engine, lla is the engine speed sensor, 12 is the flywheel, 13 is the clutch, 14 is the hydraulic clutch actuator, 15 is the piston rod, 16 is the release lever, and 117 is the clutch that is completely turned off. It is a sensor that detects 1
3 to 17 form a clutch mechanism. 18 is a hydraulic mechanism, 19 is an input shaft, 20 is a transmission,
21a is a transmission actuator, 21b is a sensor that detects the gear position, 22 is an output shaft, 23 is a vehicle speed sensor, 24 is a select lever for driver operation,
25 is a select sensor that detects the position of the select lever, 26 is an accelerator pedal, 27 is an accelerator pedal sensor that detects the amount of depression of the accelerator pedal, 28 is a carburetor, 29 is a throttle valve (hereinafter referred to as a throttle), 30 is a throttle drive step motor (throttle actuator), 31 is an electronic control device;
It has a microcomputer configuration.

That is, the electronic control unit 31 has a read-only memory 31a.
, a readable/writable data memory 31b for storing calculation results, input data, etc., and an input/output interface 31
c and a processor 31d. The memory 31a contains (a) control programs for automatic shift control and (b)
In addition to the automatic shift pattern etc., (c)
For each gear position, the correspondence between the throttle position and the engine rotation speed during gear shifting is stored.

FIG. 2 is a graph showing the basic load with respect to the target engine speed, and FIG. 3 is a graph showing the relationship between the difference between the target engine speed and the actual engine speed and the load increase/decrease.

Next, the engine load control device of the present invention will be explained with reference to FIG.

The vehicle speed, transmission gear, and actual engine speed are read (
Steps 51 to S3).

The target engine speed is calculated using the following formula (step S4), namely: 11-mark engine speed = KX ((current vehicle speed x tire effective layer)/(gear ratio of gear after shifting x final reduction ratio) ) Note that K here is a coefficient.

]] From the standard engine rotational speed, the basic load h: is determined as shown in FIG. 2 (step S5).

Next, the load increase/decrease (h) is determined from the difference between the target rotation speed and the actual rotation speed (step S6). Then, the target load is determined by the sum of the basic load amount and the load increase/decrease (step 37).
).

Next, it is determined whether the number of steps of the step motor is larger or smaller than the target load (step S8).

If it is smaller, the motor is controlled to feed in step S9).
Increment the step number counter (step S
10).

If it is larger, return the motor to control in step 5ll.
), the step number counter is decremented (step S l 2).

When the load is equal to the target load, motor hold control is performed (step 513).

(Effects of the Invention) As described in detail above, the present invention corrects the target load based on the actual engine speed, so it can adapt to fluctuations in the actual engine and perform smooth speed operation.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the engine load control device of the present invention, Fig. 2 is a graph showing the relationship between the target engine speed and the basic load j11, and Fig. 3 is a graph showing the relationship between the target engine speed and the actual engine speed. A graph showing the relationship between the difference and the load increase/decrease, FIG. 4 is a flowchart of the control according to the present invention. DESCRIPTION OF SYMBOLS 11... Engine, lla... Engine rotation speed sensor, 20... Transmission, 21a... Transmission actuator, 22b... Gear position sensor, 27... Accelerator pedal sensor, 30... Throttle actuator, 31... electronic control device. Patent Applicant Isu (Jidoto Co., Ltd. (1 other person) Representative Patent Attorney Minoru Tsuji Figure 2 Target 47mm or 1 (Load Calibration Funnel 'Filtration

Claims (1)

[Claims] The actuator is controlled to the target load by providing means for determining the load increase/decrease based on the difference between the target engine speed and the actual engine speed, and means for determining the target load from the sum of the basic load and the load increase/decrease. Engine load control device.