JPH04163257A - Wiper control device - Google Patents

Abstract

PURPOSE:To perform control of a wiper matching the feeling of a driver by operating a wiper when it is decided that a car is transferred from a stop state to a running state or it is decided that it is transferred to a reverse state to the above. CONSTITUTION:During running of a vehicle, a microcomputer MC detects the number of revolutions of an engine from the frequency of the generation of noise at a line iG through which a source voltage is fed to the MC and detects whether or not an engine is in an idling state. In which case, when an engine is in an idling state (a vehicle is in a stop state), after two seconds are set to a counter, control of an auto wiper is performed. When it is decided that a vehicle is transferred from a stop state to a running state, decrement of the set value of the counter is effected. It is detected whether or not a counter value is reduced to 0, and while the counter value is not decreased to 0, auto wiper control is effected. But, when the counter value is reduced to 0 (when two seconds set to the counter elapses during a stop), the wiper is operated one time. Further, after the pulse accumulating value of a rain sensor 1 is cleared, auto wiper control is performed.

Description

[Detailed Description of the Invention] [Summary] Regarding the wiper control device, the present invention provides wiper control that matches the feeling of the driver when the vehicle transitions from a stopped state to a running state or when the vehicle transitions from a running state to a stopped state. The purpose is to detect the engine rotation speed to determine the running state of the car, and when it is determined that the car has transitioned from a stopped state to a running state, or when the car has shifted from a running state to a stopped state. The wiper is configured to operate when the determination is made.

[Industrial application field]

The present invention relates to a wiper control device for a vehicle.

[Conventional technology]

The amount of rain that falls on a vehicle's front window is proportional to the amount of rain and vehicle speed. Rain sensors detect the amount of raindrops by outputting pulses proportional to the amount of raindrops, but the detection area is extremely small compared to the area of the front window, so the amount of rain detected decreases especially when the vehicle is at low speed or stopped ( (The number of samples sufficient for control cannot be changed), which causes variations and delays in wiper control, making it impossible to perform control that matches the driver's feeling.

In other words, when driving at low speeds or when the car is stopped, the rain sensor's detection area is insufficient, so more raindrop signals are missed than during normal driving. Conversely, when the vehicle changes from a running state to a stopped state, there may be a delay in the timing of wiping with the wiper, which is not preferable.

[Problem to be solved by the invention]

The present invention was made to solve such problems,
To eliminate the delay in wiping timing when the car changes from a stopped state to a running state or from a running state to a stopped state, and to perform wiper control that matches the driver's feeling even during such a transition between running states. This is what I did.

[Failure to solve the problem]

In order to solve this problem, according to the present invention, the running state of the car is determined by detecting the engine rotation speed, and when it is determined that the car has transitioned from a stopped state to a running state, or when the car is in a running state. Provided is a wiper control device that operates a wiper when it is determined that the wiper has transitioned to a stopped state.

[For production]

According to the above configuration, even when the car moves from a stopped state to a running state or when the car moves from a running state to a stopped state,
There is no delay in wiper wiping timing, and wiper control that matches the driver's feeling can be performed even during such transitions in driving conditions.

〔Example〕

FIG. 1 shows the configuration of a wiper control device as an embodiment of the present invention. A microcomputer MC provided in an auto wiper controller is connected to a voltage stabilizing circuit (VCC) 31 from an iG line (ignition line). A predetermined power supply voltage is supplied through the capacitor 32, and the noise corresponding to the engine rotational speed is input to the IG line through the input interface 33. The waveform of the noise is shaped through the input interface 33 and input into the microcomputer MC. Ru. Further, the pulse output from the rain sensor 1 is inputted to the microcomputer MC through the human power interface 34. Further, a signal from a cam switch 7 provided in conjunction with the wiper motor 6 (when the cam switch 7 is in the OFF position, it becomes the ground potential, and when the cam switch 7 is in the ON position, it becomes the iG line voltage) is transmitted through the input interface 35. It is input to the microcomputer MC. Here, the cam switch 7 is in the off position until the wiper arm moves approximately 10 degrees from the stop position, and when the wiper arm moves further, it is switched to the on position, and then the wiper arm is moved from the end to the cup. The on position is maintained until the wiper arm moves to the stop position and returns to the stop position, and when the wiper arm returns to the stop position, it is switched to the off position again.

As a result, when the cam switch 7 is in the on position, the cam switch signal (iG line voltage) input to the microcomputer MC monitors whether the wiper arm (that is, the wiper motor 6) is in operation; When the cam switch 7 is in the OFF position, the cam switch signal (ground potential) is input to the microcombi (5) user MC.
It is detected that the wiper arm has returned to the stop position.

41 and 42 are driver circuits connected to the output side of the microcomputer MC, and the on/off of the relay 51 is controlled through the driver circuit 41, and the on/off of the relay 52 is controlled through the driver circuit 42. controlled. Then, as described above, when the wiper arm returns to the stop position, the cam switch 7 is turned off, and the cam switch signal input to the microcomputer MC at that time causes the cam switch to be activated via the microcomputer MC and the driver circuits 41 and 42. Then, both relays 51 and 52 are turned off. As a result, a ground potential is supplied to the low-speed control terminal 61 of the wiper motor 6 through the off contact of the cam switch 7 and the off contact of the relay 51, 52 (that is, the wiper motor 6 is short-circuited). 6, a braking current flows through the short circuit, causing the wiper arm to stop at its stop position.

(6) Next, when the relay 52 is turned on via the driver circuit 42 in response to an instruction from the microcomputer MC (at this time, the relay 51 is turned off), the voltage of the iG line connected to the on-side contact of the relay 52 changes. is supplied to the low speed control terminal 61 of the wiper motor 6 via the on contact of the relay 52 and the off contact of the relay 51, and the wiper motor
(and hence the wiper arm) performs a predetermined low speed operation.

When the wiper arm operates once and returns to the above-mentioned stop position, the relays 51 and 52 are turned off and the wiper motor is temporarily stopped as described above.

Furthermore, when the amount of rain exceeds a predetermined value, the driver circuit 41 receives an instruction from the microcomputer MC.
．． 42, relays 51 and 52 are both turned on. At this time, the voltage of the iG line connected to the on-side contact of the relay 52 is supplied to the high-speed control terminal 62 of the wiper motor 6 via the on-contact of the relays 52 and 51, and the wiper motor (therefore, the wiper arm) is performs high-speed operation.

In FIG. 1, reference numeral 2 indicates an auto wiper switch (power switch), and by turning on this switch when it starts to rain, the auto wiper controller is activated.

FIG. 2 is a flowchart illustrating the operating procedure of one embodiment of the device of the present invention, in which the wipers are operated when it is determined that the vehicle has transitioned from a stopped state to a running state. .

That is, first, an initialization operation is performed in step 1, and the flag FIDL is set to 0''.Next, in step 2, the engine speed is calculated.In this case, in the embodiment shown in FIG. As described above, the engine rotation speed is detected from the frequency of noise occurrence (for example, the period of the noise) occurring on the iG line that supplies the power supply voltage to the microcomputer MC. (For example, if the engine rotation speed becomes high, Accordingly, the period of the noise becomes shorter. Next, based on the detected engine speed, it is detected in step 3 whether or not the engine is idling. Then, if the engine is idling ( (that is, the car is stopped), proceed to step 4 and set the above flag F.
After setting IDL to 1'' and further setting 2 seconds to the counter in step 5, the process proceeds to step 7 where auto wiper control is performed.Also, in step 3, the vehicle is not in an idling state (that is, the vehicle is in a running state). If so, the process proceeds to step 6, where it is detected whether or not the flag FIDL=1.Then, whether or not the flag F_rDL is set is detected.If the flag F_rDL is not “1”, the process proceeds to step 7. The auto wiper control described above is performed. Here, the auto wiper control means detecting the amount of raindrops by a rain sensor, and operating the wiper when the pulse integrated value reaches a predetermined control threshold.

Next, in step 6, the flag F InL is “1”
If so, it is determined that the vehicle has transitioned from a stopped state to a running state. In that case, the process proceeds to step 8, where the set value of the counter is decremented, and in step 9, it is detected whether the counter value has become 0 or not. As long as the counter value does not reach 0, the process proceeds to step 7 and the above-mentioned wiper control is performed, but if the counter value reaches 0 (i.e., when the 2 seconds set in the counter at the time of stopping have elapsed) ), the process proceeds to step 10, where the flag F IDL is set to "0'', the wiper is operated once in step 11, and the pulse integration of the rain sensor (rain sensor used in auto wiper control) is performed in step 12. After clearing the value, the process proceeds to step 7, where the auto wiper control described above is performed.

In this way, when the car transitions from an idling state (stopping state) to a running state, and this state continues for, for example, two seconds, the wiper is activated once to eliminate the readout of the rain sensor that occurs when the car starts moving. Compensate.

FIG. 3 is a flowchart illustrating the operating procedure of another embodiment of the device of the present invention, in which case the wiper is operated when it is determined that the vehicle has transitioned from a running state to a stopped state. .

That is, first, an initialization operation is performed in step 21, and the flag FDRV is set to "O". Next, in step 22, the engine speed is calculated. In this case as well, as described above, the engine rotational speed is detected from the frequency of occurrence of noise (for example, the period of noise) occurring in the IG line that supplies the power supply voltage to the microcomputer MC.

Next, based on the detected engine speed, it is detected in step 23 whether or not the engine is in an idling state. If the vehicle is not idling (that is, the vehicle is running), the process proceeds to step 24, where the flag FDRV is set to "1," and after which the counter is set to 2 seconds in step 25, the process proceeds to step 27. The auto wiper control described above is performed. Further, if it is determined in step 23 that the vehicle is in an idling state (that is, the vehicle is in a stopped state), the process proceeds to step 26 and the flag FDRV is set.
"1 or not is detected. Then, the flag F D
If RV is not "1 pa", the process advances to step 27 and the auto wiper control described above is performed.

Next, in step 26, if the flag Fnav is 1'', it is determined that the car has transitioned from a running state to a stopped state.In that case, the process advances to step 28, where the set value of the counter is decremented, In step 29, it is detected whether or not the counter value has become 0. Then, while the counter value has not yet become 0, the process proceeds to step 27 and the auto wiper control is performed; If the flag FDRV is set to "0" in step 30 (that is, when the two seconds set in the counter during driving have elapsed), the wiper is operated once in step 31, and further, in step 32, the flag FDRV is set to "0". After clearing the pulse integrated value of the rain sensor used in auto wiper control, the process proceeds to step 27, where the auto wiper control is performed.

In this way, even when the car transitions from a running state to an idling state (stopping state) and this state continues for two seconds, the rain sensor reading that occurs when the wiper is activated once and the car starts to stop. It also compensates for spills.

〔Effect of the invention〕

According to the present invention, there is no delay in wiping timing even when the car changes from a stopped state to a running state, or from a running state to a stopped state, and it is possible to perform wiper control that matches the driver's feeling. can.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a wiper control device as an embodiment of the present invention, FIG. 2 is a flowchart showing the operating procedure of one embodiment of the device of the present invention, and FIG. 3 is a diagram showing other devices of the present invention. FIG. 3 is a flowchart illustrating the operation procedure of the embodiment. (Explanation of symbols) 1... Rain sensor, 2... Auto wiper switch, 31... Voltage stabilization circuit, 33.34.35... Input interface, MC.
...Microcomputer, 41.42...Driver circuit, 51.52...Relay, 6...Wiper motor, 7...Cam switch, Patent applicant Fujitsu Ten Ltd. Patent application agent

Claims (1)

[Claims] 1. Determine the driving condition of the car by detecting the engine speed,
A wiper control device that operates the wiper when it is determined that the vehicle has shifted from a stopped state to a running state or when it has been determined that the vehicle has shifted from a running state to a stopped state.