JP2014025376A - Control method and control device of electronic apparatus for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise by controlling without switching loss and additional components.SOLUTION: An electric water pump P starts flow when it is controlled by a pump ECU 7 on the basis of PWM control with a prescribed Duty ratio, and in S2, a radio input state is acquired from a radio 8, and the process advances to S2. In S2, when the radio is ON, the process advances to S3 to acquire the Duty ratio, and the process advances to S4, on the other hand, when the radio is OFF, the process advances to S9 to have the prescribed Duty ratio, then the process is advances to S8 to secure PWM, and the flow is terminated. In S4, when a temperature of cooling water is lower than a target temperature, the process advances to S5 to acquire the target flow rate of cooling water from an engine ECU 5, and the process advances to S6, on the other hand, when the temperature of cooling water is higher than the target temperature, the process advances to S10 to assume 100% Duty, then the process advances to S8 to determine PWM, and the flow is terminated. IN S6, when the flow rate of the cooling water is the target flow rate or more, the process advances to S7 to assume 0% Duty, and the process advances to S8 to determine output PWM, and the flow is terminated, and further when the flow rate of the cooling water is less than the target flow rate, the process advances to S11 to assume 100% Duty, the process is advance to S8 to determine PWM, and the flow is terminated.

Description

  The present invention relates to noise suppression control for a vehicle electronic device.

  2. Description of the Related Art Conventionally, a control apparatus for an electric motor having an electric motor and a switching element connected in series with the electric motor, wherein a signal for modulating a pulse width (modulating a duty ratio) is input. There is known a control device for an electric motor in which a capacitor is provided between the element and a terminal opposite to the switching element of the electric motor, and noise generated from the switching element is suppressed by the capacitor (for example, Patent Document 1).

  Further, based on the presence or absence of a transmission signal from the portable device that responds to the output signal from the vehicle interior detection means provided in the vehicle, it is detected whether the portable device is in the vehicle interior, and the portable device is in the vehicle interior. In a smart keyless system that permits operation of a predetermined control device when detected, a smart that stops an output signal from the vehicle interior detection means when the ignition switch is set to an ON state. A controller for a toyless system is known (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 9-42096 JP 2005-262915 A

  However, the electric motor control device disclosed in Patent Document 1 uses a capacitor to reduce high-frequency noise that occurs when the switching element is turned on and off, but switching loss occurs and the burden on the switching element increases. There is a risk, and it is necessary to add a capacitor on the device.

  Further, in the control device of the smart keyless system disclosed in Patent Document 2, it is effective in the control that simply stops or reduces the signal, but the engine is operating like an engine accessory, for example. As long as the signal is continuously transmitted, it cannot be applied.

  Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to suppress noise by control without generating a switching loss and without adding components.

  According to the present invention, in the vehicular electronic device controlled at a predetermined duty ratio by PWM control, when ON input information indicating that a device receiving noise is in an ON state is acquired, the duty ratio of the vehicular electronic device is set to 0% or 100%. % Is a control method for continuing control of the vehicular electronic device at the predetermined duty ratio when ON input information indicating that the device receiving the noise is in an OFF state is obtained.

  According to this control method, when a device that receives noise acquires ON input information, the pump ECU performs ON-OFF control that is turned ON or OFF, compared to when the vehicle electronic device performs PWM control that repeats ON-OFF. Thus, switching noise can be suppressed by control without generating a switching loss and without adding components.

  In the present invention, when the ON input information is acquired, the duty ratio is set to 0% if the temperature of the predetermined location detected by the vehicle electronic device is lower than the target temperature, and if the temperature is equal to or higher than the target temperature, the duty ratio is set. This is a control method for performing the ON-OFF control to make the value 100%.

  According to this control method, if the temperature at a predetermined location is lower than the target temperature, the duty ratio is reduced to 0%, for example, by restricting the flow rate of the fluid flowing to the radiator or the oil cooler, thereby reducing the temperature at the predetermined location. It is possible to suppress excessive power consumption and reduce power consumption. Moreover, if the temperature of a predetermined location is more than target temperature, it can suppress that the temperature of a predetermined location rises too much by making said Duty ratio 100%.

  In the present invention, the vehicle electronic device is an electric pump, and when the ON input information is acquired, the duty ratio is set to 0% if the flow rate of the fluid circulated by the electric pump is equal to or higher than a target flow rate, and the fluid If the flow rate is less than the target flow rate, the ON-OFF control for setting the duty ratio to 100% is performed.

  According to this control method, if the fluid flow rate is equal to or higher than the target flow rate, the duty ratio is set to 0%, for example, by restricting the flow rate of the fluid flowing to the radiator or the oil cooler, the temperature of the fluid is further lowered. This can be suppressed and power consumption can be further reduced. Further, if the fluid flow rate is less than the target flow rate, the temperature of the fluid can be prevented from being excessively increased by setting the duty ratio to 100%.

  In the present invention, when the ON input information is acquired, the duty ratio is set to 0% when the predetermined duty ratio is controlled at a low duty ratio, and the duty ratio is set when the predetermined duty ratio is controlled at a high duty ratio. This is a control method for performing the ON-OFF control to 100%.

  According to this control method, when the predetermined duty ratio is controlled at a low duty ratio, by setting the duty ratio to 0%, for example, by restricting the flow rate of the fluid flowing to the radiator or the oil cooler, the temperature at the predetermined location is lowered. It is possible to suppress excessive power consumption and reduce power consumption. In addition, when the predetermined duty ratio is controlled at a high duty ratio, the temperature of the predetermined portion can be prevented from being excessively increased by setting the duty ratio to 100%.

  The present invention is a control device that controls a vehicular electronic device by PWM control. The vehicular electronic device includes a device that receives noise and acquires ON input information that the device that receives the noise is in an ON state. When ON-OFF control is performed to set the duty ratio of the vehicle to 0% or 100% and OFF input information indicating that the device receiving the noise is in the OFF state is acquired, the control of the vehicle electronic device is continued at the predetermined duty ratio. It is the control apparatus of the vehicle electronic device.

  According to this control device, when a device that receives noise acquires ON input information, the pump ECU performs ON-OFF control that is turned ON or OFF, compared to when the vehicle electronic device performs PWM control that repeats ON-OFF. Thus, switching noise can be suppressed by control without generating a switching loss and without adding components.

It is explanatory drawing of the engine cooling system which concerns on embodiment of this invention. It is a flowchart of the noise suppression control method of the electric water pump which concerns on embodiment of this invention.

  The configuration of the embodiment of the present invention will be described below.

  FIG. 1 is an explanatory diagram of an engine cooling system C according to an embodiment of the present invention. The engine cooling system C includes an engine E, an electric water pump P (vehicle electronic device), and a radiator R. A first flow path 1 and an electric water pump P are connected between the engine E and the electric water pump P. Is connected to the radiator R by the second flow path 2, and the radiator R and the engine E are connected by the third flow path 3, and the cooling water is supplied to the engine E, the electric water pump P, and the radiator R. And circulate with.

  The third flow path 3 has a water temperature sensor-4 that acquires the temperature of the cooling water, the engine E has an engine ECU 5, the water temperature sensor-4 has a signal of the temperature of the cooling water, and the engine ECU 5 has an engine E. A target flow rate signal based on the air flow rate (air intake amount), accelerator opening, engine speed, etc. is sent to the electric water pump P.

  Further, the electric water pump P includes a power source 6 for supplying electric power to the electric water pump P from the outside, a pump ECU 7 for controlling the electric water pump P, and a radio 8 (ON / OFF signal is sent to the pump ECU 7). Connected to a device that receives noise).

  The operation of the embodiment of the present invention will be described in accordance with the flowchart of the noise suppression control method for the electric water pump P according to the embodiment of the present invention shown in FIG.

  When the cooling water acquired by the water temperature sensor-4 reaches or exceeds a predetermined temperature (for example, 85 ° C.), the electric water pump P is controlled by the pump ECU 7 at a predetermined duty ratio by PWM control, and the cooling water is supplied to the engine E and the first one. Circulation is performed in the flow path 1, the electric water pump P, the second flow path 2, the radiator R, and the third flow path 3. Note that when PWM control is performed by the electric water pump P, switching noise is generated at the time of ON / OFF, and the radio 8 may get noise.

  The flow is started when the electric water pump P is controlled by the pump ECU 7 at a predetermined duty ratio by PWM control. In S1, the radio input state is acquired from the radio 8, and the process proceeds to S2.

  In S2, if YES with respect to whether the radio is ON (when ON input information indicating that the radio is ON is acquired), the process proceeds to S3, and the coolant temperature at this time is acquired and the process proceeds to S4. If (OFF input information indicating that the radio is OFF) is acquired, control proceeds to S9, control is performed at a predetermined duty ratio, control proceeds to S8, the output PWM is determined, and the flow ends.

  In S4, if the temperature of the cooling water is lower than the target temperature (if it is lower than the target temperature), the process proceeds to S5, the target flow rate of the cooling water is acquired from the engine ECU 5, and the process proceeds to S6. The process proceeds to S10 (if the temperature is equal to or higher than the target temperature), the duty ratio is set to 100% (the electric water pump P is turned fully open), the process proceeds to S8, the output PWM is determined, and the flow is terminated.

  In S6, if YES with respect to the cooling water target flow rate or higher (if it is higher than the target flow rate), the process proceeds to S7, the duty ratio is set to 0% (the electric water pump P is stopped), and the process proceeds to S8. When the output PWM is determined and the flow is finished, if NO (if it is less than the target flow rate), the process proceeds to S11 and the duty ratio is set to 100% (the electric water pump P is turned fully open) and the process proceeds to S8. The advance output PWM is determined and the flow is terminated.

  The effect of the embodiment of the present invention will be described.

  When the signal indicating that the radio 8 is ON is acquired, the pump ECU 7 sets the duty ratio to 100% (turns the electric water pump P fully open) as compared with the case where the electric pump P repeats ON / OFF PWM control. By switching ON / OFF control to control or duty ratio to 0% (electric water pump P is stopped), switching noise can be reduced by controlling without generating switching loss or adding parts. Can be suppressed.

  Also, if the temperature of the cooling water is lower than the target temperature, YES (less than the target temperature) and higher than the target flow rate of the cooling water, if YES (if the target flow rate is higher), the duty ratio Is controlled at 0% (the electric water pump P is stopped), so that the overcooling of the engine E (the temperature of the cooling water is too low) can be suppressed or the power consumption can be reduced.

  Furthermore, whether the temperature of the cooling water is lower than the target temperature is NO (is it higher than the target temperature) or YES if the temperature of the cooling water is lower than the target temperature (below the target temperature, ) If it is NO with respect to the cooling water target flow rate or higher (if it is less than the target flow rate), the duty ratio is controlled at 100% (the electric water pump P is fully opened) to control the engine E. -Bar heat (in which the temperature of cooling water rises too much) can be suppressed.

  Further, in S2 of the present embodiment, only the ON / OFF of the radio 8 is set as a threshold value for proceeding to S3 or S9. However, the switching noise generated from the electric water pump P is equal to or higher than the noise allowable level of the radio 8, and the radio 8 The control may proceed to S3 when ON, and the control proceeds to S9 when the switching noise generated from the electric water pump P is less than the allowable noise level of the radio 8 or when the radio 8 is OFF.

  As a first modification of the present invention, when the predetermined duty ratio acquired in S3 is 0 to 50% (controlled with a low duty ratio), the duty ratio is 0% (the electric water pump P is stopped). ) Control is performed to advance to S8, PWM is determined and the flow is terminated. When the predetermined duty ratio acquired in S3 is 51 to 100% (when controlled with a high duty ratio), the duty ratio is 100% ( Control may be performed in which the electric water pump P is rotated fully open), the process proceeds to S8, the PWM is determined, and the flow is terminated.

  The effect of the 1st modification of this invention is demonstrated. When the predetermined duty ratio acquired in S3 is 0 to 50%, by setting the duty ratio to 0%, it is possible to suppress the temperature of the predetermined portion from being excessively lowered or to reduce power consumption. Moreover, when the predetermined duty ratio acquired in S3 is 51 to 100%, it is possible to suppress the temperature of the predetermined portion from being excessively increased by setting the duty ratio to 100%.

  As a second modification of the present invention, a sheet heater may be used as the vehicle electronic device instead of the electric water pump. The sheet heater also adjusts the temperature at a predetermined duty ratio by PWM control with respect to the heating wire, and the duty ratio is set to 100 as compared with the case of performing PWM control in which the sheet heater repeats ON-OFF. By performing ON / OFF control in which the control is performed by% or the duty ratio is controlled by 0%, switching noise can be suppressed by control without generating a switching loss and without adding components.

  Further, in the present embodiment and the modification, an electric water pump or a seat heater is used as a vehicle electronic device. However, an electric oil pump, an electric power steering, an electric VVT, a power window, a sunroof are used. Vehicle electronic devices using motors such as power slide doors and power sheets, and vehicle electronic devices using heating wires such as defogger and sheet heaters may be used.

  In this embodiment, a radio is used as a device that receives noise. However, an ETC, a back camera, a corner sensor, a mobile phone, a PHS, a wireless communication device, or the like may be used.

P Electric water pump (Vehicle electronics)
8 Radio (device that receives noise)

Claims (5)

In a vehicle electronic device controlled at a predetermined duty ratio by PWM control,
When ON input information indicating that a device receiving noise is in an ON state is acquired, ON-OFF control is performed to set the duty ratio of the vehicle electronic device to 0% or 100%,
A method for controlling a vehicular electronic device that continues control of the vehicular electronic device at the predetermined duty ratio when OFF input information indicating that the device receiving the noise is in an OFF state is acquired.   When the ON input information is acquired, the duty ratio is set to 0% if the temperature of the predetermined location detected by the vehicle electronic device is lower than the target temperature, and the duty ratio is set to 100% if the temperature is equal to or higher than the target temperature. The vehicle electronic device control method according to claim 1, wherein the ON-OFF control is performed.   The vehicle electronic device is an electric pump, and when the ON input information is acquired, if the flow rate of the fluid circulated by the electric pump is equal to or higher than the target flow rate, the duty ratio is set to 0% and the flow rate of the fluid is set to the target flow rate. The method for controlling a vehicle electronic device according to claim 1 or 2, wherein the ON-OFF control is performed so that the duty ratio is 100% if the flow rate is less than the flow rate.   When the ON input information is acquired, the duty ratio is set to 0% when the predetermined duty ratio is controlled at a low duty ratio, and the duty ratio is set to 100% when the predetermined duty ratio is controlled at a high duty ratio. The method for controlling a vehicle electronic device according to claim 1, wherein the ON-OFF control is performed. A control device for controlling a vehicle electronic device by PWM control,
Equipped with equipment that receives noise,
When ON input information indicating that the device receiving the noise is in the ON state is acquired, ON-OFF control is performed to set the duty ratio of the vehicle electronic device to 0% or 100%,
An apparatus for controlling a vehicular electronic device that continues to control the vehicular electronic device at the predetermined duty ratio when acquiring OFF input information indicating that the device receiving the noise is in an off state.

Images