Hydraulic control unit, brake system, and diagnostic method

Abstract

The present invention provides a hydraulic pressure control unit, a brake system, and a diagnosis method capable of appropriately diagnosing an abnormality in a power supply line. A hydraulic pressure control unit (5) comprises: a hydraulic pressure control mechanism including an inlet valve (31) that is an electromagnetic valve electrically connected to a power supply (7) by a power supply line (8); a control device (52) that controls the operation of the hydraulic pressure control mechanism; and a resistor (35) that is electrically connected to the power supply (7) by the power supply line (8), wherein a diagnosis unit of the control device (52) performs a power supply line diagnosis in which an abnormality in the power supply line (8) is diagnosed, in a state where no current is applied to the inlet valve (31) but a current is applied to the resistor (35), on the basis of the change in voltage in the power supply line (8) when the current applied to the resistor (35) is changed.

Claims

1. A hydraulic control unit (5) used in the brake system (10) of a saddle-type vehicle (100), A hydraulic control mechanism (51) is electrically connected to a power source (7) via a power line (8), and is provided in a flow path (25) that connects the master cylinder (21) and the wheel cylinder (24), and includes a suction valve (31) which is a solenoid valve that is open when not energized and closed when energized, A control device (52) that controls the operation of the hydraulic pressure control mechanism (51), A resistor (35) is electrically connected to the power supply (7) via the power line (8), The hydraulic control unit (5) includes a switching unit (SW1, SW2, SW3) for switching the current path, Equipped with, The control device (52) includes a diagnostic unit (52c) that performs a power line diagnosis to diagnose an abnormality in the power line (8) based on the voltage change of the power line (8) when the current applied to the resistor (35) is changed while the current is applied to the resistor (35) without applying current to the sealing valve (31). The first line (L1) on which the sealing valve (31) is provided and the second line (L2) on which the resistor (35) is provided are electrically connected in parallel to the power line (8). The above state is achieved by switching the path using the switching unit (SW1, SW2, SW3) so that no current flows through the first line (L1) and current flows through the second line (L2). Hydraulic control unit.

2. By switching the path using the switching unit (SW1, SW2, SW3) so that no current flows through the second line (L2) but current flows through the first line (L1), it is possible to achieve a second state in which no current is applied to the stop valve (31) but no current is applied to the resistor (35). The diagnostic unit (52c) starts the power line diagnosis based on the fact that predetermined conditions have been met after the saddle-type vehicle (100) has started moving and the second state is in place. The hydraulic control unit according to claim 1.

3. The control device (52) includes an integrated circuit (521), The downstream end of the first line (L1) and the downstream end of the second line (L2) are connected to the integrated circuit (521), respectively. The aforementioned switching units (SW1, SW2, SW3) are A first switching element (SW1) is electrically connected to the downstream end of the first line (L1) and is built into the integrated circuit (521), A second switching element (SW2) is electrically connected to the downstream end of the second line (L2) and is built into the integrated circuit (521), including, The hydraulic control unit according to claim 1.

4. The system includes a third line (L3) that electrically connects the junction (P1) of the upstream side of the first line (L1) and the upstream side of the second line (L2) to the power line (8), The switching section (SW1, SW2, SW3) includes a third switching element (SW3) provided on the third line (L3), The hydraulic control unit according to claim 1.

5. The diagnostic unit (52c) performs the power line diagnosis when it is determined that the voltage on the power line (8) side of the third line (L3) is stable with respect to the third switching element (SW3). The hydraulic control unit according to claim 4.

6. The diagnostic unit (52c) is With the third switching element (SW3) closed, the power line diagnosis is performed. In the power line diagnosis, the voltage of the power line (8) is obtained based on the voltage on the confluence section (P1) side with respect to the third switching element (SW3) of the third line (L3). The hydraulic control unit according to claim 4.

7. The hydraulic control unit (5) according to any one of claims 1 to 6 is provided, The number of wheel cylinders (24) that communicate with one master cylinder (21) is one. Brake system.

8. A brake system (10) comprising a hydraulic control unit (5) according to any one of claims 1 to 6, A saddle-type vehicle.

9. A diagnostic method for a hydraulic control unit (5) used in the brake system (10) of a saddle-type vehicle (100), The hydraulic control unit (5) is A hydraulic control mechanism (51) is electrically connected to a power source (7) via a power line (8), and is provided in a flow path (25) that connects the master cylinder (21) and the wheel cylinder (24), and includes a suction valve (31) which is a solenoid valve that is open when not energized and closed when energized, A control device (52) that controls the operation of the hydraulic pressure control mechanism (51), A resistor (35) is electrically connected to the power supply (7) via the power line (8), The hydraulic control unit (5) includes a switching unit (SW1, SW2, SW3) for switching the current path, Equipped with, The diagnostic unit (52c) of the control device (52) performs a power line diagnosis to diagnose an abnormality in the power line (8) based on the voltage change of the power line (8) when the current applied to the resistor (35) is changed while the current applied to the resistor (35) is not applied to the sealing valve (31). In the hydraulic control unit (5), the first line (L1) on which the sealing valve (31) is provided and the second line (L2) on which the resistor (35) is provided are electrically connected in parallel to the power line (8). The above state is achieved by switching the path using the switching unit (SW1, SW2, SW3) so that no current flows through the first line (L1) and current flows through the second line (L2). Diagnostic methods.

Images