JPS5990736A - Collective control device of engine and transmission for automobile - Google Patents

Abstract

PURPOSE:To enable to run an engine under the state with minimum fuel consumption and consequently contrive to save energy by a method wherein the running state of the engine and the speed change ratio of a transmission are controlled in response to the outputs of the instruction means by a driver and of the engine output measuring means. CONSTITUTION:When the differentiated valve of the output of an acceerator pedal depressing sensor 5 becomes large due to the larger depressing speed of an accelerator pedal 11, a computer 4 controls a fuel injection actuator 9 and a suction air flow control actuator 10 so as to increase the flow rates of fuel and air. Furthermore, the computer 4 controls an electronic control transmission 3 so as to make the speed change ratio larger. After that, when the vehicular speed increases and a driver corrects the depressed position of the accelerator pedal 11 to a proper position, the computer reads the vehicular speed instructed by the drive from the output of said sensor 5 and then calculates the engine output necessary for running at said vehicular speed and controls the respective actuators 9 and 10 and the transmission 3 so as to realize minimum fuel consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for comprehensively controlling an automobile engine and transmission for the purpose of energy saving.

Conventionally, in vehicle travel control, when a driver steps on an accelerator pedal, a throttle valve mechanically connected to the pedal opens, increasing the amount of intake air and fuel to the engine, thereby increasing engine output.

The driver effectively transmits the engine output to the wheels by selecting an appropriate gear ratio using the transmission depending on the load. However, the engine operating conditions and gear ratio are not always optimal, resulting in poor fuel consumption. Especially the automatic transmission is J, il? Since the purpose is to save the time and effort of commuters, the loss is large and the fuel consumption rate is poor.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and includes a device that comprehensively automatically controls the engine and transmission so as to maintain the operating state of the engine in a range where the fuel consumption rate is as low as possible. The purpose is to provide.

In the operating region of the engine, if the vertical axis is the shaft output with respect to the engine rotational speed, the equal fuel consumption rate curve and the engine output are as shown in FIG. In the figure, A indicates the maximum engine torque, and A indicates the best engine operating condition. As can be seen from FIG. 1, the region where the fuel consumption rate is minimum is the region where the engine speed is relatively high and the engine output is high.

Therefore, it is thought that fuel consumption can be reduced by always driving near such an area. However, when the vehicle speed intended by the driver is low, and assuming that the required output is the same, increasing the gear ratio will increase the engine speed and decrease the torque, that is, as shown in the graph of Figure 1. The driving range shifts to the lower right, and the fuel consumption rate worsens. Furthermore, when the gear ratio is decreased, the operating range moves in the direction in which the engine speed decreases and the torque increases, that is, in the upper left direction of the graph in FIG. 1. Furthermore, since it is necessary to increase the shaft torque during acceleration, the operating range moves in the direction of increasing the gear ratio, increasing the engine rotational speed, and increasing the output, that is, toward the upper right of FIG. 1. Generally, a car outputs a larger output by ψ1h when accelerating, climbing, or carrying a heavy load, so when driving at a constant speed on flat ground, for example, the first
Engines with the characteristics shown in the diagram are often operated at an output of less than 10 IGV, and the fuel consumption rate falls into the minimum range only during extremely limited times such as acceleration and climbing, and during some high-speed driving. Only the condition.

Therefore, in general driving where only a small output is required, the number of operating cylinders may be reduced. For example, in a 4-cylinder engine, if 2 cylinders are deactivated and the remaining 2 cylinders are operated, the output will be small, so the operating range can be shifted to the 1st load side and the fuel consumption rate can be reduced. Dad, during steady driving, it is better to reduce the gear ratio [7] and reduce the engine speed to reduce the fuel consumption rate. In conventional automobiles, the combination of gear ratio and engine operating state is often not always appropriate when transitioning from an accelerated state to steady driving or when driving uphill. In order to achieve the acceleration and speed instructed by the driver, the present invention detects vehicle speed, engine output, etc., calculates the necessary output using a computer, and increases torque when acceleration is required. The number of operating cylinders, the gear ratio, and the engine output are controlled so that the gear ratio is increased, and in the case of constant speed, the gear ratio is made as small as possible to bring the operating range into a region where the fuel consumption rate is close to the minimum.

Furthermore, the transient characteristics are also controlled so that they pass on the optimum Enson operating line.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is an engine, 2 is an actuator that controls the number of operating cylinders of the engine 1, and 3 is a transmission that can electronically control the gear ratio. 4 is a computer that performs control; 5 is an accelerator pedal depression sensor that detects depression of the accelerator 11; 6 is a vehicle speed sensor that detects vehicle speed; 7 is an engine rotation speed sensor that detects engine rotation speed; 8 is a sensor that detects intake manifold pressure. 9 is an actuator that injects fuel into the engine 1; 10 is an actuator that controls the intake air amount of the engine 1; the computer 4 is connected to each sensor 5 to
Based on the detection signals such as No. 8, the fuel injection actuator 9, the air amount control actuator 10, the electronically controlled transmission 3, and the cylinder number control actuator 2 are actuated, and the engine output is calculated.

In the above device, when the accelerator 11 is depressed at a high speed, the differential value of the output of the accelerator depression sensor 5 becomes sharp, and the computer 4 operates accordingly, via the actuators 9 and 10 to rapidly increase the output. While increasing the amount of air and fuel 111 to the engine 1,
The gear ratio is increased through the electronically controlled transmission 3 to increase torque and increase acceleration. Also, as the vehicle accelerates, the driver controls the electronically controlled transmission 3 so that the gear ratio becomes smaller.As the vehicle speed increases, the driver changes the position of the accelerator 11 to 1a. Correct the position.

In response to this, the computer 4 reads the vehicle speed specified by the driver based on the signal output from the accelerator depression sensor 5, and the computer 4 calculates the engine output necessary to drive at the vehicle speed. The air amount, fuel amount, and gear ratio of the engine 1 are calculated so that the operating state approaches the minimum fuel consumption rate, and each actuator 9, 10 and the transmission 3 are adjusted according to the calculation results.
control. Further, if the engine output is small enough, the computer 4 issues a command to the actuator 2 to reduce the number of operating cylinders.

Also, when the engine output is not required when disembarking, the fuel supply is stopped and full engine braking is applied, but if the vehicle speed is still too high, the gear ratio is increased to ensure better engine braking. . Therefore, when the vehicle is traveling while dismounting, the gear ratio of the transmission 3 is mainly changed in response to the depression of the accelerator 11. Of course, when stepping on the brakes, the gear ratio is increased to ensure that the engine brake and mechanical brake work effectively. In this way, in this embodiment, by comprehensively controlling the operating state of the engine 1 and the gear ratio of the transmission 3,
Since the engine 1 can be operated in a state with the lowest fuel consumption rate to achieve the desired vehicle speed and acceleration, it can greatly contribute to the four energy sources.

Furthermore, when applying the brakes, by automatically increasing the gear ratio, engine braking can be effectively applied and safety can be improved.

In the above embodiment, calculations were performed by detecting the engine output, engine rotation speed, and intake manifold pressure. The engine output may be calculated from the fuel flow rate. Furthermore, fuel flow rate and residual acid in exhaust gas! <f,; Torque sensors are also used to measure the balance between engine output and load. Further, the electronically controlled transmission 3 may be a continuously variable transmission or a multi-stage transmission.

As described above, in the present invention, the operating state of the engine is determined according to the output of the driver's command means and the engine output measuring means. 11 and the gear ratio of the transmission, the engine can be operated with the lowest fuel consumption rate to obtain the desired vehicle speed and acceleration, resulting in energy savings. can contribute.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the fuel efficiency characteristic curve and the best fuel efficiency curve of the engine, and FIG. 2 is a diagram showing the configuration of the apparatus of the present invention. ■...Engine, 2...Cylinder number control actuator, 3...Electronically controlled transmission, 4 river computer, 5...
・Accelerator depression sensor, 6 Vehicle speed sensor, 7 River rotation El sensor, 8... Intake manifold pressure sensor, 9... Fuel injection actuator, 10.
...Air amount control actuator, 11...Accelerator. Agent Makoto Kuzuno - Figure 1 Enren output fKWl Enren rotational government (rpml 2nd wholesale hand i' sales amendment (voluntary) 11 "j'l'II'l<'self 1jI
', Ml °If (display of 'l' 41. Application No. 57-202514 2, name of automobile engine and transmission integrated control system; tsu? If Yamada is 4- then = If'l- Relationship 9, 1, permission 1gri person [1, place Tokyo subordinate'f (l11 ward Maru 0 Sanno-chome 2-on 3 name ((ill),':, Ryoden Ot1 to Katayama, representative of Ryoden Co., Ltd. 11, Agent 11, 2-1, Marunouchi, Chiyo-ku, Tokyo, No. 2, No. 3, No. 5, subject of amendment, 4th place of Detailed Description of the Invention in Book 11. 6. Contents of Amendment No. Correct "fuel amount" in line 6 of page 4 to "fuel".

Claims (7)

[Claims] (1) A command means for the driver to command the speed of the automobile, a means for measuring the output of the engine, a means for adjusting the amount of intake air of the engine, and a means for adjusting the amount of fuel injected into the engine. , comprising means for adjusting the number of operating cylinders of the engine, a transmission for adjusting a gear ratio, and control means for controlling each of the adjustment means and the transmission in response to signals from the command means and the engine output measurement means. An automobile engine and transmission comprehensive control device controls the engine and transmission to achieve the speed and acceleration requested by the driver while maintaining the engine's optimum operating state. (2) The engine output measuring means is configured to be i.
+W patent If! Motivation Elementary School January J
Section 1: Comprehensive control system for automobile engines and transmissions. (3) The engine and speed change of an automobile according to claim 1, wherein the engine output measuring means is constituted by means for detecting an intake air amount of the engine and means for detecting a fuel flow rate of the engine. Machine comprehensive control device. (4) The engine output measuring means is configured by means for detecting the fuel flow rate of the engine and means for detecting the amount of oxygen remaining in the exhaust gas of the engine. Automotive engine and transmission integrated control device. (5) The engine output measuring means is an engine and transmission integrated control device for an engine rotating vehicle. (6) The engine and transmission integrated control device for an automobile according to any one of claims 1 to 5, wherein the transmission is a continuously variable transmission. (7) The engine and transmission integrated control device for an automobile according to any one of claims 1 to 5, wherein the transmission is a multi-stage transmission.