JPS5943471Y2 - Safety device for throttle opening detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a throttle opening detection device that inputs throttle opening information to a control device of an electrically controlled automatic transmission for a vehicle.

The throttle opening detection device uses a throttle sensor that opens and closes a contact connecting a resistor with a movable element linked to the throttle valve of the electric appliance, increasing or decreasing the resistance value between the constant voltage source and the output terminal according to the pulp opening. However, if there is a failure such as disconnection or short circuit in the sensor or wiring, and a normal output signal cannot be obtained, this failure will be detected and the driver will be alerted, and automatic gear shifting will be performed. It is necessary to take measures to prevent danger, such as switching to manual gear shifting.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety device for a throttle opening detection device that reliably detects failure of the sensor section of the throttle opening detection device and warns the driver.

Next, the present invention will be explained based on an embodiment shown in the drawings.

Reference numeral 1 designates a throttle sensor, which connects a variable resistor R1 whose resistance value increases as the throttle opening θ increases in conjunction with a throttle valve 2 of a carburetor installed in the engine from a voltage dividing resistor R2*R3 and a constant voltage power source 3. As the throttle opening degree θ increases, the output voltage shown in the graph of FIG. 2 is generated.

Reference numeral 4 denotes a comparison HE generation circuit, which generates a low voltage for wire breakage determination which is lower than the lowest comparison voltage E2, as shown in FIG. Reference voltage E1 and maximum comparison voltage E1
□Always outputs a higher standard voltage E18 for short circuit determination.

01 to C18 are the output voltages E of the comparison voltage generation circuits, respectively.
A comparator that inputs E18 and the output voltage of throttle sensor 1, 5 a detection circuit that inputs the outputs of comparators 02 to C17 and detects the throttle opening, and 6 inputs the outputs of comparators C1 and C18. This is an abnormality detection circuit that outputs the signal to the alarm display 1.

When the throttle sensor 1 is normal, the output voltage of the throttle sensor is within the range of E2 to E17 according to changes in the throttle opening, and the comparators C1 to C18 change to low level L with this output voltage as the boundary. The comparator C1 outputs a high level output, and the comparator C1 outputs a low level comparator C18.

Throttle sensor 1 is disconnected and the output voltage is low reference voltage E
When it becomes lower than 1, the output of the comparator C1 is inverted to high level, and the abnormality detection circuit 6 outputs an output so that the warning indicator 7 is activated.

Further, when a short circuit occurs in the throttle sensor 1 and the output voltage becomes higher than the high reference voltage, the output of the comparator C18 is inverted to low level, and the abnormality detection circuit 6 activates the warning indicator 7.

As described above, the safety device of the present invention uses a comparator to detect each disconnection and short circuit of the throttle sensor and displays an alarm, so that a failure can be reliably detected.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a throttle opening detection device equipped with the safety device of the present invention, and FIG. 2 is a graph showing the output voltage of the throttle sensor. In the figure, 1...throttle sensor, 4...
- Comparison voltage generation port, C1 to C18... Comparator, 6... Abnormality detection circuit.

Claims (1)

[Scope of utility model registration request] A throttle sensor that converts throttle opening into voltage and outputs it, a comparison voltage generation circuit that outputs multiple comparison voltages that increase step by step, and multiple comparisons that input the output of the throttle sensor and each comparison voltage. It is used in a throttle opening detection device that detects the throttle opening with the output of each comparator, and has a low standard tE for detecting a disconnection that is lower than the lowest comparison voltage, and a short circuit detection higher than the highest comparison voltage. a comparison voltage generation circuit that outputs a high reference voltage for
The first input terminal inputs the low reference voltage and the output of the throttle sensor.
a second comparator inputting the high reference voltage and the output of the throttle sensor; and a second comparator inputting the outputs of the first and second comparators, the output of the throttle sensor being lower than the low reference voltage or A safety device for a throttle opening detection device comprising an abnormality detection circuit that outputs a throttle sensor abnormality signal when the voltage is higher than a high reference voltage.