JP2006011122A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for vehicles which operates a reflection mirror to open and close and eliminates the possibility of breaking a motor or drive mechanism. <P>SOLUTION: The head-up display device A for vehicles for displaying a virtual image V by projecting the display light L emitted by a display unit 2 to a reflection mirror 3 is equipped with the motor 7 for operating the reflection means pasted with a reflection mirror 3 to a supporting member 4 to open and close and a control means 14 having a clipping detection function which inputs load torque information of the motor 7 during the opening and closing operation of the reflection mirror 3, compares the load torque information and the prescribed threshold and controls the motor to stop the opening and closing operation by the supporting member 4 according to the result of the comparison. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle head-up display device that is mounted on a vehicle and displays a virtual image by projecting display light emitted from a display onto a projection member.

Conventionally, various head-up display devices for vehicles that display a virtual image by reflecting display light emitted from a light-emitting display device such as a fluorescent display tube have been proposed. The vehicle head-up display device is disposed on a dashboard of a vehicle, and displays a virtual image by reflecting display light emitted from a light-emitting display device with a reflection mirror. The reflection mirror is attached to a holding member, and the holding member is supported by the housing in a rotatable state so that the reflection mirror can be opened and closed.
Japanese Utility Model Publication No. 63-9041

  Such a vehicle head-up display device has a configuration in which the reflection mirror is closed when not used, and the reflection mirror can be opened to a predetermined angular position by a driving force of a motor when used.

  In such a vehicle head-up display device, during the opening / closing operation of the reflection mirror, the vehicle is arranged between the reflection mirror and the housing (closed direction) or between the reflection mirror and the windshield (open direction). There is a risk that objects placed on the dashboard and other objects (hereinafter referred to as foreign objects) may be caught. In addition, there is a problem that components for driving the reflection mirror may be damaged.

  The present invention has been made in view of this problem. In the case where a foreign object is caught between the reflection mirror and the housing or between the reflection mirror and the windshield during the opening / closing operation of the reflection mirror. Even if it exists, the head-up display apparatus for vehicles which does not produce a possibility of damaging a motor or a component is provided.

  The vehicle head-up display device according to the first aspect of the present invention is a vehicle head-up display device that displays a virtual image by projecting the display light emitted from the display onto the reflecting means. During the opening / closing operation of the reflection means and the driving means for opening / closing the load means, load torque information of the driving means is input, the load torque information is compared with a predetermined threshold value, and the load torque information is compared with the predetermined threshold value. And a control means having at least a pinching detection function for controlling the drive means so as to stop at least one of the opening / closing operations of the reflection means.

  According to a second aspect of the present invention, in the vehicle head-up device according to the first aspect, the control means performs the process of stopping the driving means in the pinching detection function, and then the reflecting means. The driving means is operated so as to move the reflecting means by a predetermined amount in a direction opposite to the direction in which the lens has moved.

  According to a third aspect of the present invention, in the vehicle head-up display device according to the first aspect, the pinching detection function is provided between the reflecting means and a windshield of the vehicle, or between the reflecting means and the It is formed by detecting pinching with the housing in which the reflecting means is disposed.

  According to a fourth aspect of the present invention, in the vehicle head-up device according to the first aspect of the present invention, the vehicle head-up device further includes a temperature detection unit that detects an ambient temperature, and the control unit receives temperature information from the temperature detection unit. The threshold value, which is a reference for comparing the load torque information, is changed based on the temperature information.

  According to a fifth aspect of the present invention, in the vehicle head-up display device according to the first aspect, the control means performs a predetermined time from the start of the opening / closing operation when the reflecting means is opened / closed. After the elapse of time, the load torque information is handled as valid information.

  The present invention relates to a vehicle head-up display device that projects a display light emitted from a display onto a reflecting means to display a virtual image. The driving means for driving the reflecting means even when a foreign object is sandwiched, or the reflecting means There is no risk of damaging the components.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The configuration of the vehicle head-up display device will be described with reference to FIGS. 1 and 2.

  The vehicle head-up display device A is disposed on the dashboard 1 of the vehicle, and displays the virtual image V by reflecting the display light L emitted from the light emitting display 2 with the reflection mirror 3. The reflection mirror 3 is affixed to a holding member 4, and this holding member 4 is supported by a housing 5 in a rotatable state so that the reflection mirror 3 can be opened and closed. A gear 6 is fixed to the holding member 4, and a gear 8 fixed to a rotating shaft 7 a of a motor (driving means) 7 is engaged with the gear 6. The reflection mirror 3 can be opened and closed around the rotation shaft 4a of the holding member 4. The reflection mirror 3 is closed when the vehicle head-up display device A is not used, and the motor 7 is driven when it is used. The reflection mirror 3 can be opened to a predetermined angular position by force. In addition, since the angular position of the reflection mirror 3 is adjusted according to the eye level of the driver, the motor 7 can be driven and the reflection mirror 3 can be rotated by a predetermined operation of the operation means described later. The housing 5 is provided with a transmission portion 5a for guiding the display light L emitted from the display 2 to the reflection mirror 3. The reflecting mirror 3 and the holding member 4 constitute a reflecting means.

  Next, the electrical configuration of the main part of the vehicle head-up display device A will be described with reference to FIG.

  The electrical configuration mainly includes a temperature detection unit 10, an operation unit 11, upper and lower limit detection units 12 and 13, a control unit 14, a display 2, and a motor 7.

  The temperature detection means 10 is a thermistor, detects ambient temperature where the motor 7 is disposed, and detects temperature information at the time of pinching detection processing by the control means 14 described in detail later. The temperature detection means 10 is arranged on a circuit board (not shown) that is electrically connected to the display 2 arranged in the housing 5, so that temperature information can be transmitted to the control means 14.

  For example, the operation unit 11 includes a plurality of self-returning type or self-holding type push button switches, and the control unit 14 rotates the motor 7 forward and backward in accordance with a predetermined input from the operation unit 11. The reflection mirror 3 (holding member 4) is opened and closed.

  The upper limit detecting means 12 is composed of a limit switch, a photoelectric tube sensor, and the like, and has a predetermined direction in the direction in which the reflection mirror 3 rotates in the direction of the windshield 15 of the vehicle (see FIG. 1) (hereinafter referred to as the opening direction). This is to detect arrival at the rotational position.

  The lower limit detection means 13 is composed of a limit switch, a photoelectric tube sensor, and the like, similar to the upper limit detection means 12, and is predetermined in the direction in which the reflection mirror 3 rotates in the dashboard direction (see FIG. 1) (hereinafter referred to as the closing direction). This is for detecting the arrival at the rotational position.

  The control means 14 is mainly composed of a microcomputer. The control unit 14 includes various input information from the temperature detection unit 10, the operation unit 11, the upper limit and lower limit detection units 12 and 13, vehicle information input by serial communication processing from the vehicle ECU (engine control unit), or the motor 7. Input / output interface circuit for inputting load torque information inputted from the drive circuit 7a for driving the motor and outputting various control signals to the display 2 and the motor 7, temperature information from the temperature detecting means 10 and the motor 7 stores a processing program for obtaining temperature data and load torque data according to the load torque information 7, a processing program for displaying the vehicle information on the display unit 2, or an opening / closing operation processing program for the reflecting mirror 3. ROM, CPU for executing each program, calculation results, input information, etc. And it has a RAM for synchronic stores.

  The motor 7 is composed of a DC motor, and rotates forward and backward in accordance with a drive signal output from the drive circuit 7a based on a command from the control means 14 to open and close the reflection mirror 3. The drive circuit 7 a of the motor 7 outputs load torque information to the control means 14. In the present embodiment, load torque information can be obtained by measuring the drive current of the motor 7.

  The display 2 is composed of a liquid crystal display element, an organic EL element, a fluorescent display tube, and the like. A self-luminous display is constituted by self-luminous or backlight means, and a drive circuit based on display information data from the control means 14. A predetermined display form is obtained by the drive signal output from 2a.

  Next, the opening / closing processing operation of the reflection mirror 3 in the control means 14 will be described with reference to FIG.

  When the control means 14 inputs input information for performing any one of the opening / closing operations from the operation means 11, for example, an operation signal for moving the reflecting mirror 3 in the closing direction (step S1), the control means 14 drives the motor 3. Thus, the reflecting mirror 3 is moved in the closing direction (step S2).

  Next, the control unit 14 executes an input information invalidation process that invalidates the acquisition of the load torque information (steps S3 and S4). The input information invalidation process is a process of invalidating the acquisition of the drive current at the initial stage of driving because an inrush current is generated in which the rise of the drive current at the initial stage of driving of the motor 7 is larger than the drive current at the time of detection. It is. Therefore, the control unit 14 invalidates the acquisition of the drive current until a predetermined time (for example, 100 ms) elapses from the start of driving of the motor 7.

  Next, the control means 14 validates the input of the temperature information from the temperature detection means 10 after the input information invalidation process is completed (step S5). The control unit 14 receives temperature information (detection voltage that changes according to temperature) from the temperature detection unit 10 to obtain temperature information data, and obtains threshold value data I that serves as a reference value during the pinching detection process from the temperature information data. This is to be selected (step S6). This process is for performing the pinching detection process with high accuracy because the drive current of the motor 7 has temperature dependency (the drive current increases as the ambient temperature increases).

  For example, the control means 14 has three types of threshold data I in each temperature region of a low temperature region (-30 ° C. or more and less than 0 ° C.), a normal temperature region (0 ° C. or more and less than 50 ° C.), and a high temperature region (50 ° C. or more). Threshold data I corresponding to the ambient temperature is selected by specifying one of the threshold data I stored in the ROM and corresponding to the input of temperature information from the temperature detection means 10. Will be.

  And the control means 14 inputs the drive current used as load torque information from the drive circuit 7a of the motor 7 (step S7), calculates | requires the load torque data i according to this drive current, this load torque data i, The threshold data I selected according to the ambient temperature is compared (step S8). If the load torque data i is smaller than the threshold data I (I> i), the housing 5 and the reflecting mirror 3 (holding member 4) The motor 7 is continuously driven on the assumption that no foreign matter is caught between the two, and it is determined whether or not the reflecting mirror 3 has reached the rotational position where the lower limit detecting means 13 is disposed. The motor 7 is stopped by the input of the detection signal to complete the closing operation (step S9).

  In step S8, if the load torque data i is equal to or greater than the threshold data I, the control means 14 determines that there is a foreign object caught between the housing 5 and the reflecting mirror 3 (pinch detection function) and stops the motor 7. Then, the reflecting mirror 3 is immediately stopped at the rotation position at that time (step S10). Then, the control unit 14 rotates (rotates) the reflection mirror 3 in the direction opposite to the direction in which the reflection mirror 3 has moved by rotating the motor 7 reversely for a predetermined time (for example, 0.5 s), and then again the motor 7. The process which stops is performed (step S11).

  The control means 14 waits for the input of the operation signal from the operation means 11 again after Step S11, and performs the opening / closing operation from the stop position. In addition, although the description mentioned above was the closing operation | movement which rotates the reflective mirror 3 to a housing direction, since it is the same also in the opening operation | movement which rotates the reflective mirror 3 to the windshield 15 side, detailed description is abbreviate | omitted. .

  Such a vehicle head-up display device A relates to an apparatus for displaying a virtual image V by projecting the display light L emitted from the display device 2 onto a reflection mirror 3, and reflecting means formed by attaching a support member 4 to the reflection mirror 3. During the opening / closing operation of the reflecting mirror 3 and the motor 7 that is a driving means for opening / closing the motor, the driving current that is the load torque information of the motor 7 is input, and the driving current data i is obtained from this driving current, Control means 14 having a pinching detection function for comparing the drive current data i with predetermined threshold data I and controlling the motor 7 to stop the opening / closing operation by the reflection mirror 3 according to the comparison result. Is.

  Therefore, even if a foreign object is caught between the reflecting mirror 3 and the windshield 15 or between the reflecting mirror 3 and the housing 5, the operation of the motor 7 can be stopped immediately. As a result, the motor 7 can be prevented from being damaged, and the components including the support member 4 that rotates the reflection mirror 3 can be prevented from being damaged.

  Further, the control means 14 executes the process for stopping the motor 7 in the above-described pinching detection function, and then moves the motor 7 to move the reflecting mirror 3 by a predetermined amount in the direction opposite to the direction in which the reflecting mirror 3 has moved. Since it operates, it becomes easy to remove the foreign material sandwiched between the reflection mirror 3 and the windshield 15 or the foreign material sandwiched between the reflection mirror 3 and the housing 5.

  In addition, a temperature detection means 10 for detecting the ambient temperature is provided, and the control means 14 inputs temperature information from the temperature detection means 10 and changes a threshold value I as a reference for comparison of the load torque information based on the temperature information. Thus, even when the driving current i of the motor 7 changes according to the ambient temperature, an accurate pinching detection function can be obtained.

  The control means 14 handles the driving current i of the motor 7 as valid information after a predetermined time has elapsed from the start of the opening / closing operation when the reflecting mirror 3 is opened / closed. Since the input of the rising current (inrush current) generated can be invalidated, it is possible to prevent malfunction in the pinching detection function.

  The control means 14 in the above-described embodiment has a pinching detection function in the opening direction and the closing direction of the reflecting mirror 3, but the present invention takes into consideration the frequency of foreign object pinching and considers at least one direction of the opening and closing direction. Any device having a pinching detection function may be used.

It is the schematic which shows the head-up display apparatus for vehicles in embodiment of this invention. It is principal part sectional drawing of the head-up display apparatus for vehicles of embodiment same as the above. It is a figure which shows the electrical constitution of the head-up display apparatus for vehicles of embodiment same as the above. It is a figure which shows the processing operation of the head-up display apparatus for vehicles of embodiment same as the above.

Explanation of symbols

A Vehicle head-up display device 2 Display 3 Reflection mirror (reflection member)
4 Holding member 5 Housing 7 Motor (drive means)
10 temperature detection means 11 operation means 14 control means

Claims (5)

A vehicle head-up display device that projects a display light emitted from a display onto a reflecting means to display a virtual image,
Driving means for opening and closing the reflecting means;
During the opening / closing operation of the reflecting means, the load torque information of the driving means is input, the load torque information is compared with a predetermined threshold value, and at least one of the opening / closing operations of the reflecting means is performed according to the comparison result. Control means having at least a pinch detection function for controlling the drive means to stop
A vehicle head-up display device comprising:   The control means operates the drive means so as to move the reflection means by a predetermined amount in a direction opposite to the direction in which the reflection means has moved after executing the process of stopping the drive means in the pinching detection function. The vehicle head-up display device according to claim 1, wherein the vehicle head-up display device is provided.   2. The pinching detection function detects pinching between the reflecting means and a windshield of a vehicle or between the reflecting means and a housing in which the reflecting means is disposed. A head-up display device for a vehicle according to claim 1.   Temperature detecting means for detecting an ambient temperature, and the control means inputs temperature information from the temperature detecting means, and changes the threshold value which is a reference for comparing the load torque information based on the temperature information. The vehicle head-up display device according to claim 1.   2. The vehicle head according to claim 1, wherein the control unit treats the load torque information as valid information after a predetermined time has elapsed since the start of the opening / closing operation when the reflecting unit is opened / closed. Up display device.

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