JP6834876B2 - Vehicle shift range switching device - Google Patents

Description

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

Patent Document 1 discloses a shift-by-wire system in which an auxiliary battery is provided as a backup power source for the main battery, and when the main battery fails, the auxiliary battery and the shift-by-wire mechanism are connected and disconnected by a relay.

JP-A-2015-0834404

In the shift-by-wire system described in Patent Document 1, a relay is periodically connected to diagnose an abnormality that diagnoses whether or not the power supply from the auxiliary battery to the shift-by-wire mechanism can be normally performed, and the auxiliary battery is connected. It is conceivable to diagnose the power supply status from. However, in the shift-by-wire system described in Patent Document 1, energization of the actuator of the shift-by-wire mechanism for abnormality diagnosis and energization of the actuator for switching the actuator of the shift-by-wire mechanism according to the shift range operation of the driver There is a possibility that the driver's shift range operation request cannot be met due to interference with the command.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an energization command to an actuator of a shift-by-wire mechanism for abnormality diagnosis and an actuator for switching an actuator according to a driver's operation. An object of the present invention is to provide a vehicle shift range switching device capable of suppressing the driver's inability to meet the shift range operation request due to interference with the energization command.

The vehicle shift range switching device according to the present invention includes a valve that is moved to a position where hydraulic pressure can be output corresponding to the shift range and a control valve that can control the hydraulic output state to the engaging device of the automatic transmission. The hydraulic circuit of the automatic transmission, the shift range operation detection unit that detects the shift range operation state of the driver, the actuator that switches the position of the valve to the position corresponding to each shift range, and the actuator that can supply power. A main power supply, an auxiliary power supply capable of supplying power to the actuator via a relay, a valve control unit that controls the output state of the control valve, and the relay are temporarily connected to control the energized state of the actuator. A vehicle shift range switching device including an abnormality diagnosis unit for diagnosing an abnormality in a circuit that supplies power from the auxiliary power source by detecting the abnormality diagnosis unit, wherein the vehicle is traveling in a drive range. The abnormality diagnosis is performed on the condition that the abnormality is present, and when the shift range operation detection unit detects the neutral range operation during the abnormality diagnosis, the valve control unit controls the output state of the control valve. The automatic transmission is set to a power cutoff state, and after the abnormality diagnosis is completed, the actuator switches the position of the valve to a position corresponding to the neutral range.

According to the vehicle shift range switching device according to the present invention, the abnormality diagnosis unit performs abnormality diagnosis on 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. Will be done. Then, for the driver's neutral range operation, the state of the automatic transmission is controlled to the power cutoff state without operating the actuator. As a result, 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 shift range operation of the driver interfere with each other, so that the shift range of the driver It is possible to suppress the inability to meet the operation request.

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

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

〔Constitution〕
First, the configuration of the vehicle shift range switching device according to the embodiment of the present invention will be described with reference to FIG.

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

In the present embodiment, the T / M 20 is composed of a stepped automatic transmission, and is P according to a shift range selected by a shift range operating device such as a shift lever installed near the driver's seat of a vehicle, for example. It is configured so that any shift range of (parking) range, R (reverse) range, N (neutral) range, and D (drive) range is established.

The vehicle shift range switching device 1 according to the 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 supply 5, an auxiliary power supply 6, an actuator (ACT) 7, and a hydraulic circuit. 8. The hydraulic control device 9 and the ECU (Electronic Control Unit) 10 are provided as main components.

The shift range operation detection unit 2 detects the 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 the shift range established by the 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 supply (auxiliary battery) 5 is connected to the ACT 7 via the relay 12a, and supplies drive 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 drive power to the ACT 7 via the relay 12b.

The ACT 7 is composed of a motor and a deceleration mechanism, and uses the drive power supplied from the main power source 5 and the auxiliary power source 6 to move the position of the manual valve 8a included in the hydraulic circuit 8 to a position corresponding to each shift range. 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. By being driven by the ACT 7, the manual valve 8a is moved to a position where the oil 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 engaging device of the T / M 20.

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

The oil pressure control device 9 controls the output state of the oil pressure from the control valve 8b according to the control signal from the ECU 10.

The ECU 10 is composed of 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 temporarily connects the relay 12b and detects the energized state of the ACT 7 on the condition that the vehicle is traveling in the D range or the R range, thereby moving from the auxiliary power supply 6 to the ACT 7. It functions as an abnormality diagnosis unit that executes abnormality diagnosis of the power supply circuit that supplies power.

In a vehicle shift range switching device having such a configuration, the ECU 10 executes the shift range switching process shown below to give an energization command to the ACT 7 for abnormal diagnosis of the power supply circuit and a driver's shift range operation. It is possible to prevent the driver from being unable to respond to the shift range operation request due to interference with the energization command to the ACT 7 for switching the ACT 7 according to the response. Hereinafter, the operation of the ECU 10 when executing the shift range switching process will be described with reference to FIG.

[Shift range switching process]
FIG. 2 is a flowchart showing a flow of shift range switching processing according to an embodiment of the present invention. The flowchart shown in FIG. 2 starts at the 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 electric signals output from the shift range detection unit 3 and the vehicle speed sensor 4. Determine. As a result of the determination, when the shift range of the T / M 20 is in the D range and the vehicle is running (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 the T / M 20 is not in the D range and the vehicle is not running (step S1: No), the ECU 10 executes the process of step S1 again after the predetermined control cycle has elapsed.

In the process of step S2, the ECU 10 determines whether or not there is a request to switch the shift range from the D range to the N range based on the electric signal output from the shift range operation detection unit 2. As a result of the determination, if 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 or not the abnormality diagnosis of the power supply circuit is being executed. As a result of the determination, when the 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, if 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 process 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. As a result, the process of step S4 is completed, and the shift range switching process returns to the process of step S1.

In the process of 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 shift range of the T / M 20 to the N range by controlling the control valve 8b via the hydraulic control device 9. As a result, 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 the 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 performs an abnormality diagnosis. When the shift range operation detection unit 2 detects the N range operation during the operation, the hydraulic control device 9 controls the output state of the control valve 8b to set the state of the T / M 20 to the power cutoff state, resulting in an abnormality. After the diagnosis is completed, the ACT 7 switches the position of the manual valve 8a to a position corresponding to the N range. Then, according to such a configuration, since the ECU 10 performs the abnormality diagnosis of the power supply circuit on the condition that the vehicle is traveling in the D range, the shift range operation of the driver is limited to the N range operation. Then, for the driver's N range operation, the state of the T / M 20 is controlled to the power cutoff state without operating the ACT 7. As a result, the energization command to the ACT 7 for abnormality diagnosis and the energization command to the ACT 7 for switching the ACT 7 according to the shift range operation of the driver interfere with each other to meet the driver's shift range operation request. It is possible to suppress the loss.

In the shift range switching process according to the embodiment of the present invention, when it is determined in the process of step S1 that the shift range of the A / T 20 is in the D range and the vehicle is running, the ECU 10 steps. It was decided to execute the processing after S2, but as shown in FIG. 3, in the processing of step S11, when it is determined that the shift range of A / T20 is in the R range and the vehicle is running, The ECU 10 may execute the processing after step S12. Since the processing of steps S12 to S15 shown in FIG. 3 is the same as the processing of steps S2 to S5 shown in FIG. 2, the description thereof will be omitted below.

Although the embodiment to which the invention made by the present inventors has been applied has been described above, the present invention is not limited by the description and the drawings which form a part of the disclosure of the present invention according to the present embodiment. That is, other embodiments, examples, operational 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.

1 Vehicle shift range switching device 2 Shift range operation detection unit 3 Shift range detection unit 4 Vehicle speed sensor 5 Main power supply 6 Auxiliary power supply 7 Actuator (ACT)
8 Flood control circuit 8a Manual valve 8b Control valve 9 Flood 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 that is moved to a position where the oil pressure corresponding to the shift range can be output and a control valve that can control the output state of the oil pressure to the engaging device of the automatic transmission
A shift range operation detector that detects the driver's shift range operation status,
An actuator that switches the position of the valve to a position corresponding to each shift range, and
A main power source capable of supplying power to the actuator and
An auxiliary power supply that can supply power to the actuator via a relay,
A valve control unit that controls the output state of the control valve,
An abnormality diagnosis unit that temporarily connects the relay and detects the energized state of the actuator to diagnose an abnormality in a circuit that supplies power from the auxiliary power supply.
It is a shift range switching device of a vehicle equipped with
The abnormality diagnosis unit performs the abnormality diagnosis on condition that the vehicle is traveling in the drive range.
When the shift range operation detection unit detects a neutral range operation during an abnormality diagnosis, the valve control unit controls the output state of the control valve to power-off the state of the automatic transmission. A vehicle shift range switching device, characterized in that, after the abnormality diagnosis is completed, the actuator switches the position of the valve to a position corresponding to the neutral range.

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