JP2019056390A - Shift range switching device for vehicle - Google Patents

Abstract

To provide a shift range switching device for a vehicle capable of suppressing a driver's shift range operation request from being not complied with as a command for electric power supply to an actuator of a shift-by-wire mechanism for abnormality diagnosis and a command for electric power supply to the actuator for actuator switching responsive to the driver's shift range operation interfere with each other.SOLUTION: In a shift range switching process as one embodiment of the present invention, an ECU 10 takes a diagnosis of abnormality on a power circuit on condition that a vehicle is traveling in a D-range mode, a hydraulic controller 9 controls, when a shift range operation detection part 2 detects an N range operation during the diagnosis of abnormality, an output state of a control valve 8b to place a T/M 20 in a power cutoff state, and an ACT 7 switches, after the diagnosis of abnormality is completed, the position of a manual valve 8a to a position corresponding to an N range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shift range switching device for a vehicle.

  Patent Document 1 discloses a shift-by-wire system that includes an auxiliary battery as a backup power source for the main battery, and connects and disconnects the auxiliary battery and the shift-by-wire mechanism by a relay when the main battery fails.

Japanese Unexamined Patent Publication No. 2015-083404

  In the shift-by-wire system described in Patent Document 1, a relay is connected periodically to diagnose whether or not power supply from the auxiliary battery to the shift-by-wire mechanism can be performed normally, and the auxiliary battery It is conceivable to diagnose the state of power supply from. However, in the shift-by-wire system described in Patent Document 1, energization to the actuator for switching the actuator of the shift-by-wire mechanism in accordance with the energization command to the actuator of the shift-by-wire mechanism for abnormality diagnosis and the driver's shift range operation. The interference with the command may not be able to meet the driver's request for shift range operation.

  The present invention has been made in view of the above problems, and its purpose is to provide an actuator for switching an actuator in accordance with an energization command to an actuator of a shift-by-wire mechanism for abnormality diagnosis and a driver's operation. An object of the present invention is to provide a shift range switching device for a vehicle that can prevent a driver from responding to a shift range operation request due to interference with an energization command.

  The shift range switching device for a vehicle according to the present invention includes a valve that is moved to a position that can output hydraulic pressure corresponding to the shift range, and a control valve that can control the output state of hydraulic pressure to the engagement device included in the automatic transmission. A hydraulic circuit of an automatic transmission having a shift range operation detecting unit for detecting a shift range operation state of a driver, an actuator for switching the valve position to a position corresponding to each shift range, and supplying electric power to the actuator A main power supply, an auxiliary power supply capable of supplying electric power to the actuator via a relay, a valve control unit for controlling the output state of the control valve, and the energization state of the actuator by temporarily connecting the relay. An abnormality diagnosing unit that performs an abnormality diagnosis of a circuit that supplies power from the auxiliary power supply by detecting the shift level of the vehicle The abnormality diagnosis unit performs the abnormality diagnosis on the condition that the vehicle is traveling in the drive range, and the shift range operation detection unit performs the neutral range when performing the abnormality diagnosis. When detecting an operation, the valve control unit controls the output state of the control valve to set the state of the automatic transmission to a power shut-off state, and after the abnormality diagnosis is completed, the actuator moves the position of the valve. Is switched to a position corresponding to the neutral range.

  According to the vehicle shift range switching device of the present invention, the abnormality diagnosis unit performs abnormality diagnosis on the condition that the vehicle is traveling in the drive range, so that the driver's shift range operation is limited to the neutral range operation. Is done. For the driver's neutral range operation, the state of the automatic transmission is controlled to the power cut-off state without operating the actuator. As a result, the driver's shift range is affected by interference between the energization command to the actuator of the shift-by-wire mechanism for abnormality diagnosis and the energization command to the actuator for switching the actuator according to the driver's shift range operation. It can suppress that it becomes impossible to respond to the operation request.

FIG. 1 is a schematic diagram illustrating a configuration of a vehicle shift range switching device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the flow of shift range switching processing according to an embodiment of the present invention. FIG. 3 is a flowchart showing a flow of a modification of the shift range switching process shown in FIG.

  Hereinafter, the configuration and operation of a vehicle shift range switching device according to an embodiment of the present invention will be described with reference to the drawings.

〔Constitution〕
First, with reference to FIG. 1, the structure of the shift range switching apparatus of the vehicle which is one Embodiment of this invention is demonstrated.

  FIG. 1 is a schematic diagram illustrating a configuration of a vehicle shift range switching device according to an embodiment of the present invention. As shown in FIG. 1, a vehicle shift range switching device 1 according to an embodiment of the present invention is a shift-by-wire shift range switching device that switches a shift range of an automatic transmission (T / M) 20 by electric control. It is configured.

  In the present embodiment, the T / M 20 is constituted by a stepped automatic transmission, for example, according to the shift range selected by a shift range operating device such as a shift lever installed near the driver's seat of the vehicle. Any one of a shift range among a (parking) range, an R (reverse) range, an N (neutral) range, and a D (drive) range is established.

  A vehicle shift range switching device 1 according to an embodiment of the present invention includes a shift range operation detection unit 2, a shift range detection unit 3, a vehicle speed sensor 4, a main power source 5, an auxiliary power source 6, an actuator (ACT) 7, and a hydraulic circuit. 8, a hydraulic control device 9 and an ECU (Electronic Control Unit) 10 are provided as main components.

  The shift range operation detection unit 2 detects an operation state of the shift range operation device by the driver, and outputs an electric signal indicating the detected operation state to the ECU 10.

  The shift range detection unit 3 detects a shift range established at T / M 20 and outputs an electric signal indicating the detected shift range to the ECU 10.

  The vehicle speed sensor 4 detects the speed of the vehicle (vehicle speed) and outputs an electric signal indicating the detected vehicle speed to the ECU 10.

  The main power source (auxiliary battery) 5 is connected to the ACT 7 via the relay 12a, and supplies driving power to the ACT 7 via the relay 12a.

  The auxiliary power supply 6 is connected to the ACT 7 via the relay 12b, and supplies driving power to the ACT 7 via the relay 12b.

  The ACT 7 includes a motor and a speed reduction mechanism, and moves the position of the manual valve 8a included in the hydraulic circuit 8 to a position corresponding to each shift range by using driving power supplied from the main power supply 5 or the auxiliary power supply 6. To switch the shift range of T / M20.

  The hydraulic circuit 8 includes a manual valve 8a and a control valve (linear solenoid valve) 8b. The manual valve 8a is moved by the ACT 7 to a position where the hydraulic pressure corresponding to each shift range can be output to the T / M 20. The control valve 8b switches the shift range of the T / M 20 by controlling the output state of the hydraulic pressure to the engagement device that the T / M 20 has.

  In T / M20, the driving force is output only when the position of the manual valve 8a matches the hydraulic pressure output state of the control valve 8b, and the position of the manual valve 8a does not match the hydraulic pressure output state of the control valve 8b. The shift range is the N range.

  The hydraulic control device 9 controls the output state of the hydraulic pressure from the control valve 8b in accordance with a control signal from the ECU 10.

  The ECU 10 is configured by an information processing device including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and controls the operation of the entire shift range switching device 1 of the vehicle. In the present embodiment, the ECU 10 switches from the auxiliary power supply 6 to the ACT 7 by temporarily connecting the relay 12b and detecting the energization state of the ACT 7 on the condition that the vehicle is traveling in the D range or the R range. It functions as an abnormality diagnosis unit that performs abnormality diagnosis of a power supply circuit that supplies power.

  In the shift range switching device for a vehicle having such a configuration, the ECU 10 executes a shift range switching process shown below, whereby an energization command to the ACT 7 for power supply circuit abnormality diagnosis and a shift range operation of the driver are performed. It prevents that it becomes impossible to respond to a driver | operator's shift range operation request | requirement by the interference with the electricity supply command to ACT7 for switching of ACT7 according to. Hereinafter, with reference to FIG. 2, the operation of the ECU 10 when executing the shift range switching process will be described.

[Shift range switching processing]
FIG. 2 is a flowchart showing the flow of shift range switching processing according to an embodiment of the present invention. The flowchart shown in FIG. 2 starts at a timing when the ignition switch of the vehicle is switched from the off state to the on state, and the shift range switching process proceeds to the process of step S1.

  In the process of step S1, the ECU 10 determines whether or not the shift range of the T / M 20 is in the D range and the vehicle is running based on the electrical signals output from the shift range detection unit 3 and the vehicle speed sensor 4. Determine. If the result of determination is that the shift range of T / M 20 is in the D range and the vehicle is traveling (step S1: Yes), the ECU 10 advances the shift range switching process to the process of step S2. On the other hand, when the shift range of T / M 20 is not in the D range and the vehicle is not traveling (step S1: No), the ECU 10 executes the process of step S1 again after a predetermined control period has elapsed.

  In the process of step S2, the ECU 10 determines whether or not there is a shift range switching request from the D range to the N range based on the electrical signal output from the shift range operation detection unit 2. As a result of the determination, when there is a switching request (step S2: Yes), the ECU 10 advances the shift range switching process to the process of step S3. On the other hand, when there is no switching request (step S2: No), the ECU 10 returns the shift range switching process to the process of step S1.

  In the process of step S3, the ECU 10 determines whether an abnormality diagnosis of the power supply circuit is being executed. As a result of the determination, when abnormality diagnosis of the power supply circuit is being executed (step S3: Yes), the ECU 10 advances the shift range switching process to the process of step S4. On the other hand, when the abnormality diagnosis of the power supply circuit is not being executed (step S3: No), the ECU 10 advances the shift range switching process to the process of step S5.

  In the processing of step S4, the ECU 10 controls the shift range of the T / M 20 to the N range by controlling the control valve 8b via the hydraulic control device 9 without operating the ACT 7. Thereby, the process of step S4 is completed and the shift range switching process returns to the process of step S1.

  In step S5, the ECU 10 drives the ACT 7 by connecting the relay 12b, thereby switching the position of the manual valve 8a to a position corresponding to the N range. Further, the ECU 10 controls the control valve 8b via the hydraulic control device 9 to control the shift range of the T / M 20 to the N range. Thereby, the process of step S5 is completed and the shift range switching process returns to the process of step S1.

  As is clear from the above description, in the shift range switching process according to an embodiment of the present invention, the ECU 10 performs an abnormality diagnosis of the power supply circuit on the condition that the vehicle is traveling in the D range, and the abnormality diagnosis When the shift range operation detection unit 2 detects the N range operation while performing the control, the hydraulic control device 9 controls the output state of the control valve 8b to change the T / M 20 state to the power shut-off state. After the diagnosis is completed, the ACT 7 switches the position of the manual valve 8a to a position corresponding to the N range. According to such a configuration, the ECU 10 performs abnormality diagnosis of the power supply circuit on the condition that the vehicle is traveling in the D range, so that the shift range operation of the driver is limited to the N range operation. And with respect to a driver | operator's N range operation, the state of T / M20 is controlled to a power cutoff state, without operating ACT7. Accordingly, the energization command to ACT7 for abnormality diagnosis and the energization command to ACT7 for switching ACT7 according to the driver's shift range operation interfere, thereby responding to the driver's shift range operation request. It is possible to suppress being lost.

  In the shift range switching process according to an embodiment of the present invention, if it is determined in step S1 that the shift range of A / T 20 is in the D range and the vehicle is traveling, the ECU 10 performs step The process after S2 is executed, but as shown in FIG. 3, in the process of step S11, when it is determined that the shift range of A / T 20 is in the R range and the vehicle is traveling, ECU10 is good also as performing the process after step S12. 3 are the same as the processes in steps S2 to S5 shown in FIG. 2, and therefore the description thereof is omitted below.

  As mentioned above, although the embodiment to which the invention made by the present inventors was applied has been described, the present invention is not limited by the description and the drawings that constitute a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle shift range switching device 2 Shift range operation detection part 3 Shift range detection part 4 Vehicle speed sensor 5 Main power supply 6 Auxiliary power supply 7 Actuator (ACT)
8 Hydraulic circuit 8a Manual valve 8b Control valve 9 Hydraulic control device 10 ECU (Electronic Control Unit)
12a, 12b Relay 20 Automatic transmission (T / M)

Claims (1)

A hydraulic circuit of an automatic transmission having a valve moved to a position capable of outputting hydraulic pressure corresponding to the shift range and a control valve capable of controlling the output state of the hydraulic pressure to the engagement device of the automatic transmission;
A shift range operation detection unit for detecting the shift range operation state of the driver;
An actuator for switching the position of the valve to a position corresponding to each shift range;
A main power supply capable of supplying power to the actuator;
An auxiliary power source capable of supplying electric power to the actuator via a relay;
A valve control unit for controlling the output state of the control valve;
An abnormality diagnosis unit that performs abnormality diagnosis of a circuit that supplies power from the auxiliary power source by temporarily connecting the relay and detecting an energization state of the actuator;
A shift range switching device for a vehicle comprising:
The abnormality diagnosis unit performs the abnormality diagnosis on the condition that the vehicle is traveling in a driving range,
When the shift range operation detection unit detects a neutral range operation during abnormality diagnosis, the valve control unit controls the output state of the control valve to change the state of the automatic transmission to a power shut-off state. And after the abnormality diagnosis is completed, the actuator switches the position of the valve to a position corresponding to a neutral range.

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