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A vehicle speed control system for a vehicle including a failure detector configured to determine whether or not a failure occurs in the vehicle, a vehicle speed restriction controller configured to control a driving power source to decrease a vehicle speed of the vehicle when the failure detector d

A vehicle speed control system for a vehicle including a failure detector configured to determine whether or not a failure occurs in the vehicle, a vehicle speed restriction controller configured to control a driving power source to decrease a vehicle speed of the vehicle when the failure detector detects the failure, and a driving state detector configured to detect a driving state of the vehicle. The vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure.

대표청구항 ▼

1. A vehicle speed control system for a vehicle comprising: a failure detector configured to determine whether or not a failure occurs in the vehicle;a vehicle speed restriction controller configured to control an engine to decrease a vehicle speed of the vehicle when the failure detector detects th

1. A vehicle speed control system for a vehicle comprising: a failure detector configured to determine whether or not a failure occurs in the vehicle;a vehicle speed restriction controller configured to control an engine to decrease a vehicle speed of the vehicle when the failure detector detects the failure;a driving state detector configured to detect a driving state of the vehicle;an operation position sensor configured to detect a position of an input member which is operated by a driver;a driving power output controller including a throttle valve which controls an amount of intake-air supplied to the engine, an actuator configured to cause the throttle valve to change an opening degree, and an actuator controller configured to control the actuator based on a signal output from the operation position sensor; anda throttle opening degree sensor configured to detect the actual opening degree of the throttle valve;wherein the vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure;wherein the vehicle speed restriction controller is configured to instruct the actuator controller to cause the throttle valve to decrease the opening degree to a target restriction opening degree if it is determined that the opening degree corresponding to the signal output from the operation position sensor is not smaller than the actual opening degree detected by the throttle opening degree sensor, thereby decreasing the vehicle speed, when the failure detector detects the failure; andwherein the vehicle speed restriction controller is configured not to execute deceleration control and the actuator controller is configured to control the actuator based on the signal output from the operation position sensor, when the throttle opening degree corresponding to the signal output from the operation position sensor is smaller than the opening degree detected by the throttle opening degree sensor. 2. The vehicle speed control system according to claim 1, wherein the throttle valve is provided with a biasing mechanism configured to apply a force to cause the throttle valve to be moved to a restricted position;the system further comprising: a motor drive circuit connected to a pair of power feeding terminals of the actuator;wherein the motor drive circuit is switchable between a brake mode in which the pair of power feeding terminals are electrically connected and a free mode in which the pair of power feeding terminals are electrically disconnected from each other; andwherein the vehicle speed restriction controller is configured to switch the motor drive circuit between the brake mode and the free mode to control a vehicle speed decrease rate, when the failure detector detects the failure. 3. The vehicle speed control system according to claim 2, wherein the vehicle speed restriction controller is configured to control the vehicle speed decrease rate in such a manner that the motor drive circuit is switched between the brake mode and the free mode, when the failure detector detects the failure in the driving power output controller. 4. The vehicle speed control system according to claim 1, wherein the driving state detector includes a vehicle speed sensor which detects the vehicle speed of the vehicle; andwherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate decreases as the vehicle speed detected by the vehicle speed sensor at detection of the failure by the failure detector increases. 5. The vehicle speed control system according to claim 1, wherein the driving state detector includes an acceleration sensor which detects a driving acceleration of the vehicle; andwherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate decreases as the driving acceleration detected by the acceleration sensor at detection of the failure by the failure detector increases. 6. The vehicle speed control system according to claim 1, wherein the driving state detector includes a gear position sensor configured to detect a gear position of a transmission in the vehicle; andwherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate decreases as the gear position detected by the gear position sensor at detection of the failure decreases. 7. The vehicle speed control system according to claim 1, wherein the driving state detector includes a vehicle speed sensor which detects the vehicle speed of the vehicle; andwherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate is smaller than a predetermined decrease rate when the vehicle speed detected by the vehicle speed sensor at detection of the failure by the failure detector is higher than a preset value, and the vehicle speed decrease rate conforms to the predetermined decrease rate when the vehicle speed detected by the vehicle speed sensor at detection of the failure by the failure detector is not higher than the preset value. 8. The vehicle speed control system according to claim 1, wherein the driving state detector includes an acceleration sensor which detects a driving acceleration of the vehicle; andwherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate is smaller than a predetermined decrease rate when the driving acceleration detected by the acceleration sensor at detection of the failure by the failure detector is higher than a preset value, and the vehicle speed decrease rate conforms to the predetermined decrease rate when the driving acceleration detected by the acceleration sensor at detection of the failure by the failure detector is not higher than the preset value. 9. The vehicle speed control system according to claim 1, wherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that the vehicle speed changes as a linear function with respect to time when the driving state detector detects a first driving state of the vehicle, and changes as a function changing in a curve shape with respect to time when the driving state detector detects a second driving state of the vehicle. 10. The vehicle speed control system according to claim 1, further comprising: a weight sensor configured to be able to detect a weight of a load carried on the vehicle;wherein the vehicle speed restriction controller is configured to determine the deceleration pattern such that a vehicle speed decrease rate increases as the weight of the load which is detected by the weight sensor increases. 11. The vehicle speed control system according to claim 1, wherein the engine is provided with an ignition device which ignites an air-fuel mixture in the engine;wherein the vehicle speed restriction controller is configured to retard an ignition timing of the ignition device to decrease the vehicle speed, when the failure detector detects the failure. 12. A straddle-type vehicle comprising: a failure detector configured to determine whether or not a failure occurs in the vehicle;a vehicle speed restriction controller configured to control an engine to decrease a vehicle speed of the vehicle when the failure detector detects the failure;a driving state detector configured to detect a driving state of the vehicle;an operation position sensor configured to detect a position of an input member which is operated by a driver;a driving power output controller including a throttle valve which controls an amount of intake-air supplied to the engine, an actuator configured to cause the throttle valve to change an opening degree, and an actuator controller configured to control the actuator based on a signal output from the operation position sensor; anda throttle opening degree sensor configured to detect the actual opening degree of the throttle valve;wherein the vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure;wherein the vehicle speed restriction controller is configured to instruct the actuator controller to cause the throttle valve to decrease the opening degree to a target restriction opening degree if it is determined that the opening degree corresponding to the signal output from the operation position sensor is not smaller than the actual opening degree detected by the throttle opening degree sensor, thereby decreasing the vehicle speed, when the failure detector detects the failure; andwherein the vehicle speed restriction controller is configured not to execute deceleration control and the actuator controller is configured to control the actuator based on the signal output from the operation position sensor, when the throttle opening degree corresponding to the signal output from the operation position sensor is smaller than the opening degree detected by the throttle opening degree sensor. 13. A method of controlling a vehicle speed of a vehicle, comprising: determining whether or not a failure occurs in the vehicle, via a failure detector;controlling an engine to decrease a vehicle speed of the vehicle via a vehicle speed restriction controller when the failure is detected;detecting a driving state of the vehicle;detecting a position of an input member which is operated by a driver, via an operation position sensor;detecting an actual opening degree of a throttle valve that controls an amount of intake-air supplied to the engine, via a throttle opening degree sensor;controlling an actuator for the throttle valve via an actuator controller based on a signal output from the operation position sensor; anddetermining a deceleration pattern based on the driving state detected at detection of the failure;wherein the vehicle speed restriction controller is configured to instruct the actuator controller to cause the throttle valve to decrease the opening degree to a target restriction opening degree if it is determined that the opening degree corresponding to the signal output from the operation position sensor is not smaller than the actual opening degree detected by the throttle opening degree sensor, thereby decreasing the vehicle speed, when the failure detector detects the failure; andwherein the vehicle speed restriction controller is configured not to execute deceleration control and the actuator controller is configured to control the actuator based on the signal output from the operation position sensor, when the throttle opening degree corresponding to the signal output from the operation position sensor is smaller than the opening degree detected by the throttle opening degree sensor. 14. A vehicle speed control system for a vehicle comprising: a command detector configured to detect a vehicle speed change command which is given by a driver;a failure detector configured to determine whether or not a failure occurs in the vehicle;a vehicle speed restriction controller configured to control an engine to decrease a vehicle speed of the vehicle regardless of whether or not the vehicle speed change command is a vehicle speed restriction command or when the failure detector detects failure;a driving state detector configured to detect a driving state of the vehicle;an operation position sensor configured to detect a position of an input member which is operated by the driver;a driving power output controller includes a throttle valve which controls an amount of intake-air supplied to the engine, an actuator configured to cause the throttle valve to change an opening degree, and an actuator controller configured to control the actuator based on a signal output from the operation position sensor; anda throttle opening degree sensor configured to detect the actual opening degree of the throttle valve;wherein the vehicle speed restriction controller is configured to determine a deceleration pattern according to the driving state detected by the driving state detector at detection of the failure;wherein the vehicle speed restriction controller is configured to instruct the actuator controller to cause the throttle valve to decrease the opening degree to a target restriction opening degree if it is determined that the opening degree corresponding to the signal output from the operation position sensor is not smaller than the actual opening degree detected by the throttle opening degree sensor, thereby decreasing the vehicle speed, when the failure detector detects the failure; andwherein the vehicle speed restriction controller is configured not to execute deceleration control and the actuator controller is configured to control the actuator based on the signal output from the operation position sensor, when the throttle opening degree corresponding to the signal output from the operation position sensor is smaller than the opening degree detected by the throttle opening degree sensor. 15. The vehicle speed control system according to claim 14, where the deceleration pattern is a decreasing pattern of the opening degree of the throttle valve.