Boots – shoes – and leggings
Reissue Patent
1990-02-21
2001-11-06
Bennet, Henry A. (Department: 3744)
Boots, shoes, and leggings
C123S350000
Reissue Patent
active
RE037434
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a fuel injection system and an ignition system in an internal combustion engine, and more particularly to a control method for the internal combustion engine of an automotive vehicle which is well suited to meet the driver's various requirements relating to the driving of the vehicle.
Heretofore known electronic fuel injection control systems employ a method of intermittently supplying the fuel in an amount corresponding to the intake air flow rate and also varying the fuel quantity during the period of acceleration and deceleration (refer the below-mentioned (1) and (2)). During constant speed driving, this method can supply the engine with an amount of air and a fuel quantity which are proportional to the load and therefore there is no inconvenience. However, the method is disadvantageous in that the engine cannot be controlled properly during transient conditions, e.g., times of acceleration and deceleration.
As described above, the conventional control systems have been unable to provide satisfactory functions to meet the highly sophisticated and diversified requirements relating to driving performance. On the other hand, while torque servo controls and speed servo controls are proposed (e.g., the below-mentioned techniques (3) and (5)) to meet sophisticated requirements, no satisfactory consideration has been given to an overall control ensuring proper control under all conditions which are encountered by the vehicle.
Note that the prior art techniques relating to these types of systems include the following, for example.
(1) IDEI: “The Engine Controls”, Institute of Electrical Engineers of Japan Journal Vol. 101, No. 12, P. 1148 (December 1981) . . . Controls by Microcomputers; This relates to table look-up systems.
(2) NAGAYAMA et al: Centralized Control of Engine by Microcomputers, Systems and Controls, Vol. 24, No. 5, P. 306 (May 1980); This relates to flow charts of engine operations, fuel injection control, ignition timing control and idling speed control.
(3) T. TABE et al: On the Application of Modern Control Theory to Automotive Engine Control, IECOM '85; This relates to torque servos.
(4) JP-A-57-73836
(5) ITO: “Fuel Economy Optimalizing Control System with Compound Control Action on Engine and Transmission”, Automotive Engineering, February 83; This relates to speed servos.
The above-mentioned conventional techniques have failed to give due consideration in comprehensively grasping as a system the control of the engine on a vehicle. Thus, there have been a lack of engine control methods which could meet all the situations in which the vehicle is to be used and the difficulty to establish the necessary parameters for such engine control methods has been a disadvantage.
One reason is that the conventional engine control methods are made up of static models despite the fact that the conditions which are encountered by a vehicle are a repetition of steady-state operations, e.g., the constant speed running and idling operation and the transient state operation such as acceleration and deceleration. Moreover, the requirements for the behaviour of the vehicle during the transient conditions have become increasingly severe on the part of the users of the vehicles. As a result, even if measuring devices are installed to observe the transient conditions, their full utilization cannot be ensured by the static model.
In the case of the conventional methods in which the static control model is compensated for the transient conditions, a great deal of manhours are required to materialize and adjust an engine control method for each of different types of vehicles which are diversely different in vehicle characteristics, measuring devices, actuators, etc.
SUMMARY OF THE INVENTION
With a view to overcoming the foregoing deficiencies in the prior art, it is an object of the invention to provide a method of controlling an internal combustion engine mounted on a vehicle in which different vehicle conditions and driver's different intents are respectively discriminated and divided into categories so as to select a proper one of a plurality of engine control methods corresponding to each of various combinations of the categories.
To adapt the dynamic characteristic of the vehicle to the sensitivity or fancy of the driver, it is only necessary to discriminate and classify the preferences of the driver into certain preference modes, such as, sporty, luxury and economy modes of driving and change the parameters of the respective control methods to suit the corresponding modes. To realize the selection of the engine control methods corresponding to the above discrimination and classification, it is only necessary to develop the software of the computer incorporated in the engine control system in such a manner that a higher priority level is allocated to allow execution of the condition discriminating and classifying function in preference to the other functions.
The discrimination and classification of the vehicle's conditions and driver's intents are performed in the following way. The conditions of the vehicle can be detected in terms of the vehicle speeds and vehicle speed changes. The driver indicates an intent concerning the driving by engaging the torque transmission mechanism (the clutch and the transmission) and depressing the brake pedal or the accelerator pedal. In other words, the driver indicates his intent in correspondence to the situation of the vehicle by selectively depressing the two pedals. The intent is represented by the angles and angular velocities of the pedals and their time series loci. The conditions of the vehicle and the intents of the driver can be detected in detail in accordance with the measured values from a certain prior time up to the present time as to the vehicle speed and its time rate of change and the angle and angular velocity of the brake and accelerator pedals. The angular velocity of the accelerator pedal is equivalent to the acceleration rate {dot over (&thgr;)}ac in FIG.
4
. In addition, by utilizing these measured values, it is possible to estimate the condition of the vehicle and the intent of the driver and predict the future condition of the vehicle.
As regards the construction of the running controls of the vehicle, as will be described later with reference to the illustrated embodiments, there are a method of realizing the controls by a cascade connection of torque servo system, speed servo system and tracking servo system and another method of preparing the previously mentioned various engine control methods in a parallel manner.
The method of determining the preferences of the driver for vehicle operation may, for example, be to provide three selector switches respectively corresponding to the “sporty”, mode placing emphasis on drivability, “luxury” mode placing emphasis on driving comfortability and “economy” mode placing emphasis on practicality so that the parameters of each engine control method are changed in response to the selection of one of the selector switches.
The computer used for realizing the abovementioned method may be of the high type speed and the operation program may be prepared such that the condition discrimination and the selection of the engine control methods are effected most preferentially.
REFERENCES:
patent: 4551802 (1985-11-01), Smyth
patent: 4597049 (1986-06-01), Murakami
patent: 4829434 (1989-05-01), Karmel et al.
patent: 2151049 (1985-07-01), None
patent: 2151048 (1985-07-01), None
Atago Takeshi
Funabashi Motohisa
Onari Mikihiko
Sekozawa Teruji
Antonelli Terry Stout & Kraus LLP
Bennet Henry A.
Hitachi , Ltd.
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