CN103967379B

CN103967379B - A kind of control method of lifting glass for vehicle window

Info

Publication number: CN103967379B
Application number: CN201410195270.2A
Authority: CN
Inventors: 赵保军; 胡啸; 陈飞; 李建才
Original assignee: SAIC Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2014-05-09
Filing date: 2014-05-09
Publication date: 2016-08-24
Anticipated expiration: 2034-05-09
Also published as: CN103967379A

Abstract

The invention discloses the control method of a kind of lifting glass for vehicle window, wherein sample circuit gathers the size of current of each Car window electric machine motion, according to the size of current collected and situation of change, main control MCU judges which kind of state motor is in, carry out opening and stopping of window lifting according to motor state in which.Hardware circuit design of the present invention is simple, and cost is relatively low；Control window lifting by control strategy, it is possible to protection motor, do not allow its long over loading move, effective ensure that vehicle window has enough electric currents and proper motion in the winter of cold.

Description

Control method for lifting of car window glass

Technical Field

The application belongs to the field of automotive electronics, and relates to a control method for lifting of window glass, which is used for controlling electrical functions of an automobile body.

Background

The control method for lifting the window glass mainly comprises the following 2 methods:

1. the relay of the glass lifting motor is directly controlled by the switch, and the switch is switched on by pressing the relay, so that the function is realized; the scheme does not have an automatic lifting function, and can not automatically cut off output under the condition of overcurrent to protect a motor and a circuit;

2. the method has the advantages that the automatic function and the automatic cut-off output can be achieved, however, the problem that the motor cannot move and the window glass cannot smoothly lift due to the fact that the motor is prone to being too large in movement current and the output is frequently cut off in cold winter is caused.

Disclosure of Invention

In order to solve the problems, the invention discloses a control method for lifting vehicle window glass, which comprises the following steps: the sampling circuit collects the motion current of each window motor, the master control MCU judges the state of the motor according to the collected current and the change condition, and the window lifting is started and stopped according to the state of the motor.

Wherein,

21) when the current of one motor motion is detected to be greater than 62.5% of the starting current, whether the current of more than 1 window is greater than 62.5% of the starting current is detected;

22) when it is determined that the motor current of only one window is greater than 62.5% of the starting current, detecting whether the motor current is greater than or equal to 100% of the starting current and lasts for 400 ms;

23) when the motor current is determined to be greater than or equal to 100% of the starting current and lasts for 400ms, cutting off the current movement of the window;

24) when it is determined that the motor current is not greater than or equal to 100% of the starting current, the window glass up-and-down movement is performed.

Wherein,

31) when the motor current of more than 1 window is determined to be greater than 62.5% of the starting current in the step 21), keeping the window with the first entering current entering the state of being greater than 62.5% of the starting current to continue moving, and stopping other windows;

32) detecting whether the current of the window motor which continues to move is greater than or equal to 100% of the starting current or not, and the duration time is 400 ms;

33) when it is determined that the motor current is greater than or equal to 100% of the starting current and lasts for 400ms, the movement of the present window is cut off.

And step 33) detecting whether the input signal of the window lifting switch in the pause state still remains effective, and starting the lifting action of the window when the input signal of the window lifting switch still remains effective.

And in step 33), when detecting that a plurality of input signals of the window lifting switch in the pause state still remain effective, starting the lifting action of only one window.

Further, the single maximum driving time is limited to 8S.

The hardware circuit of the invention has simple design and lower cost; the control strategy is used for controlling the lifting of the car window, so that the motor can be protected, the long-time overload motion of the motor is avoided, and the car window can be effectively ensured to have enough current and normally move in cold winter.

Drawings

FIG. 1: a current detection hardware circuit diagram;

FIG. 2: flow chart of window glass lifting.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, a high-precision sampling small-resistance resistor is connected in series to a motor circuit, and the voltage on the sampling resistor is amplified and then sent to an AD port of a main control chip, so as to determine the current magnitude of the circuit (i.e., the working current of the motor at this time).

For convenience of explanation, the left front window, the right front window, the left rear window, and the right rear window are respectively defined as windows A, B, C, D; the working current is less than 10.6A and the locked-rotor current is less than 24A according to the parameters of the car window manufacturer.

In order to match the wire diameter on the hardware design, A, B is placed under the same fuse (option 30A), B, C is placed under the same fuse (option 30A); the selection principle of the fuse is as follows: rated current/0.75, so a fuse of 30A is selected.

As shown in fig. 2, when only one motor (motor a) moves, the sampling circuit collects the current magnitude of the movement of the window motor, when the collected current reaches 62.5% of the starting current, the motor overload state is considered to be reached at this time, because the starting current is less than or equal to the locked-rotor current, the threshold is further amplified to 100% of the starting current, and if the current lasts for 400ms, the motor overload state is considered to enter the limit position, and the output is cut off;

if 2 motors (motor A and motor B) move simultaneously, but locked rotor does not occur simultaneously, one motor enters locked rotor and the other motor normally moves, the current maximum value at the moment is the sum of locked rotor current and moving current, the data is less than or equal to 39 (24 +24 × 62.5% = 39), according to the parameters of the fuse, when the fuse of 30A passes through the current of 39A, the effective time exceeds 500ms, under the data, the locked rotor window moves for 400ms by the value of starting current, and if the current is in a normal state, the output is cut off after 400 ms; if the resistance is large, the motor can move to the extreme position because the threshold is 100% of the starting current at the moment;

if 2 motors move simultaneously and locked rotor happens simultaneously (a motor C and a motor D), the current is very large at the moment, in order to protect a main board and a circuit, the motor which firstly enters the locked rotor moves under the condition of keeping the value of 100 percent of starting current, the other motor stops the power supply and stops the motion, after the first motor moves to the limit position (the locked rotor current reaches 100 percent of the starting current for 400 ms), the motor relay which is stopped in front can automatically pull and move under the condition that the switch is still effective, the vehicle window can be ensured to lift to the limit position, and only the difference of the motion time is realized under the condition that the resistance is large in cold winter;

if more than 2 motors move simultaneously (motor A, motor B, motor C and motor D), as analyzed above, if locked rotor occurs, other motors are suspended first, and then the motor is attracted gradually, under normal working conditions, the locked rotor of the motor has delay, the delay of 4 motors is 2S, and the time can be accepted in practical test; in chilly winter, can guarantee that the door window can normally go up and down, the defect lies in can not go up and down simultaneously, nevertheless considers the actual condition, goes up and down one by one according to the order and can understand, and 4 door and windows in winter take place less simultaneously the circumstances of going up and down after all, and under operating mode such as some toll stations, the motion condition of single door window is more, can guarantee the normal lift of door window this moment.

Claims

1. A control method for lifting and lowering a vehicle window glass is characterized in that:

1) the sampling circuit collects the current of each window motor;

2) the main control MCU judges the state of the motor according to the collected current and the change condition, the opening and the stopping of the lifting of the car window are carried out according to the state of the motor,

24) performing a window glass up-and-down movement when it is determined that the motor current is not greater than or equal to 100% of the starting current;

wherein,

2. The control method of window glass lifting according to claim 1, characterized in that:

3. The control method of window glass lifting according to claim 1, characterized in that:

4. A control method of ascending and descending of a window glass according to any one of claims 1 to 3, characterized in that: the single maximum drive time is limited to 8S.