JPS6315075Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a key input device that instructs a central processing unit, that is, a microcomputer, to perform various arithmetic operations to control various parts of a vehicle.

BACKGROUND ART Recently, electronic control devices have been realized in which microcomputers are installed in automobiles to control the engine, brakes, driving stability, etc. to maintain optimum conditions. This type of device uses various sensors to create pulses corresponding to measured quantities obtained as a result of vehicle travel, such as engine rotation speed, vehicle speed, oil level, oil temperature, etc., and detect changes in these.
Based on this information, a microcomputer performs arithmetic processing to control various drive systems. Therefore, a key input device and a digital display device are provided on the dashboard of an automobile, and various commands are transmitted to the microcomputer in advance through the key input device. As a result, with this type of device, for example, fuel consumption, remaining drivable distance, etc., which were previously calculated manually or using a separate computer,
It has become possible to instantly know the driving status of a car, such as its average speed, without leaving the room. Therefore, the above-mentioned key input device is provided with a keyboard for instructing the microcomputer to perform these calculation and display processes. However, conventionally, this keyboard can be operated at all times. As a result, there is a possibility that the driver may operate the vehicle while the vehicle is running, and it is not desirable for safe operation that the number of driving operations is increased beyond that required for conventional driving.

This proposal was made in consideration of these points, and its purpose is to measure quantities that are not directly necessary for driving the vehicle from the keyboard (for example, calculating fuel consumption, remaining mileage) when the vehicle reaches a certain speed or higher. It prevents calculation display commands such as possible distance and average speed from working, and displays only the data necessary for driving the vehicle (engine rotation speed, vehicle speed, oil level, oil temperature) to prevent driver attention at high speeds. The purpose is to prevent the objects from scattering and ensure safe operation.

The present invention will be explained below with reference to the drawings. The figure shows the configuration of an apparatus according to an embodiment of the present invention.
2 is a rotation speed detection unit that creates and outputs pulses corresponding to changes in engine rotation speed; 2 is a vehicle speed detection unit that creates and outputs pulses that correspond to changes in vehicle speed;
Reference numeral 3 denotes an oil amount detection section that detects a change in oil amount and outputs a corresponding pulse, and 4 an oil temperature detection section that detects a change in oil temperature and outputs a corresponding pulse. These are well-known sensors. Consists of electronic circuits.
These detectors are just examples, and this type of device may also include detectors that detect other parts, such as the compression ratio of the engine, the mixture ratio of oil and air, and the like.
The pulses outputted from these detection units 1 to 4 are respectively input as binary data to a central processing unit 5, that is, a well-known microcomputer 5. The microcomputer 5 controls various parts (not shown), such as a carburetor, according to a predetermined routine. This control value is set in advance and cannot be changed from the keyboard. The keyboard 6 shown in this figure includes, for example, keys for performing four arithmetic operations, commands for calculating and displaying remaining travel distance, commands for calculating and displaying fuel efficiency calculations, and the like. A display device 7 displays the processing results of the microcomputer 5 in response to commands from the keyboard 6.

By the way, in the present invention, a prohibition function section 8 is provided in the conventional device as described above. This inhibition function unit 8 inputs pulses corresponding to changes in vehicle speed to a counter 81, counts the number of pulses, inputs a command from the keyboard 6 to an AND gate 82, and sets the output of the counter 81 and the desired vehicle speed in advance. A comparator 84 compares the output of the setting input circuit 83 which sets the .

The operation of this prohibition function section 8 will be explained below. First, a desired vehicle speed is preset by the setting input circuit 83 in advance. This setting input circuit 83 is configured, for example, by a well-known encoder circuit that outputs a binary encoded signal of the vehicle speed so that it can be compared with the count value of the output of the counter 81 obtained by counting pulses corresponding to the vehicle speed. . Further, the comparator 84 compares the count value A output from the counter 81 and the setting input value B output from the setting input circuit 83, and outputs, for example, a low level signal when A>B. This low level signal from comparator 84 closes the gate of AND gate 82. As mentioned above, the command signal from the keyboard 6 is input to this AND gate as a high level signal, and only one command system is shown in the figure. Therefore, the command signal input from the keyboard 6 to the prohibition function section 8 increases as appropriate in accordance with various commands, and the AND gate 82 increases as appropriate, and the corresponding signal of the microcomputer 5 increases accordingly. The number of terminals 51 to which command signals are input also increases accordingly. As a result, when a low level signal is input from the comparator 84 to the AND gate 82, the AND gate 82 closes, and a high level command signal from the keyboard 6 is not transmitted to the terminal 51 of the microcomputer 5. This means that the prohibition function section 8 automatically prevents the command signal from the keyboard 6 from being transmitted to the microcomputer when the vehicle speed exceeds a speed set in advance by the setting input circuit 83.

As described above, according to the present invention, measured quantities such as vehicle engine speed, vehicle speed, oil amount, oil temperature, etc. are detected and input to the central processing unit, and the central processing unit is processed by various commands from the keyboard. The arithmetic processing unit performs various calculation processes, displays the results on the display device as display quantities related to the above-mentioned measured quantities, and also issues unnecessary commands while the vehicle is running, such as fuel consumption calculation, remaining drivable distance, and average speed. The driver's safety is improved because the central processing unit is prohibited from displaying the four arithmetic calculations as a calculator in accordance with the detected vehicle speed.

[Brief explanation of the drawing]

The figure shows a configuration diagram of an apparatus according to an embodiment of the present invention. 1 to 4...Detection unit, 5...Central processing unit,
6...keyboard, 7...display device, 8...prohibited function section.

Claims (1)

[Scope of Claim for Utility Model Registration] Measured quantities obtained as a result of vehicle running, such as the vehicle's engine speed, oil level, and vehicle speed, are input into the central processing unit, and the central processing unit is processed by commands from the keyboard. In a key input device of a vehicle that performs each calculation process to obtain the remaining travel distance, fuel consumption, etc. and displays the results as a display amount related to the measured quantity and the calculation result, the remaining travel distance fuel consumption is input from the keyboard. A key input for a vehicle, characterized in that the vehicle is equipped with a prohibition function section that prevents calculation display commands that are not necessary during driving, such as the above, from being transmitted to the central processing unit when the detected vehicle speed exceeds a certain speed. Device.