JPH01179221U

JPH01179221U -

Info

Publication number: JPH01179221U
Application number: JP7635788U
Authority: JP
Priority date: 1988-06-10
Filing date: 1988-06-10
Publication date: 1989-12-22

Description

[Brief explanation of the drawing]

第１図は、本考案に係る自動車用空気調和装置
におけるセンサの診断装置の回路構成図、第２図
は、前記装置の動作を表す動作フローチヤート、
第３図は、従来例に係る自動車用空気調和装置に
おけるセンサ入力部のブロツク図である。１……内気センサ（２つのセンサ）、２……外
気センサ（２つのセンサ）、９……Ａ／Ｄコンバ
ータ、１０……マイクロコンピユータ、１１……
電源、１２……直列回路、１３……第１カプラ、
１４……第２カプラ、１５……コンパレータ（電
圧比較器）、１６……トランジスタ（接点切換器
）、Ｒ１……第１抵抗器、Ｒ２……第２抵抗器、
Ｒ３……第３抵抗器、Ｘ点……第１接続点、Ｙ点
……第２接続点。 FIG. 1 is a circuit diagram of a diagnostic device for a sensor in an automotive air conditioner according to the present invention, and FIG. 2 is an operation flowchart showing the operation of the device.
FIG. 3 is a block diagram of a sensor input section in a conventional automobile air conditioner. 1... Inside air sensor (two sensors), 2... Outside air sensor (two sensors), 9... A/D converter, 10... Microcomputer, 11...
power supply, 12... series circuit, 13... first coupler,
14... Second coupler, 15... Comparator (voltage comparator), 16... Transistor (contact switch), R1... First resistor, R2... Second resistor,
R3...Third resistor, X point...First connection point, Y point...Second connection point.

Claims

[Scope of Claim for Utility Model Registration] By inputting the detection values from various sensors 8 that detect the temperature inside and outside the vehicle interior to the microcomputer 10 via the A/D converter 9, the temperature of the air blown into the vehicle interior can be determined. In the automobile air conditioner configured to control the vehicle, two sensors 1 and 2 of the various sensors 8 are connected to the battery 11 of the vehicle through the first resistor R1 and the first coupler 13 and the second coupler, respectively. A series circuit 12 connected in series via 14 is connected and the other end is grounded, and in parallel to each of the two sensors 1 and 2, in order to set the weighting of each of the sensors 1 and 2. A second resistor R2 and a third resistor R3 are connected, and a first connection point X, which is a connection point between the first resistor R1 and the series circuit 12, is connected to the While connected to the microcomputer 10, the second resistor R
A voltage comparator 15 for comparing the magnitude of the input voltage and a predetermined voltage is connected to the second connection point Y, which is the connection point between the input voltage and the third resistor R3, and the other end is connected to the microcomputer 10. A diagnostic device for a sensor in an air conditioner for an automobile, characterized in that it is also connected to a contact switch 16 that switches contacts using a command from the microcomputer 10 as a control signal.