Hybrid vehicle and control method thereof
First Claim
1. A hybrid vehicle, having an internal combustion engine capable of outputting power for driving the hybrid vehicle and equipped in an exhaust system with a catalytic conversion unit including a purifying catalyst for purifying exhaust, a motor constructed to input and output power for driving the hybrid vehicle, a battery unit including at least one secondary battery designed to transmit electric power to and from the motor, and a charger connected to an external power supply in a system shutdown state of the hybrid vehicle to charge the secondary battery of the battery unit with electric power from the external power supply, the hybrid vehicle being capable of:
- motor travel when the hybrid vehicle is driven only with input and output power to and from the motor andhybrid travel when the hybrid vehicle is driven with output power from the internal combustion engine and with the input and output power to and from the motor,the hybrid vehicle comprising;
an accumulated charge ratio calculation module configured to calculate an accumulated charge ratio that is a ratio of an accumulated charge amount in the at least one secondary battery of the battery unit to a whole capacity of the at least one secondary battery of the battery unit;
a mode setting module configured to, when the calculated accumulated charge ratio is at least larger than a first preset ratio at system startup of the hybrid vehicle, set a motor travel priority mode where the motor travel is prioritized for driving the hybrid vehicle until the calculated accumulated charge ratio becomes less than a second preset ratio that is less than the first preset ratio during vehicle travelling, while setting a hybrid travel priority mode where the hybrid travel is prioritized for driving the hybrid vehicle when the motor travel priority mode is not set; and
a control module configured to, when the calculated accumulated charge ratio becomes less than a third preset ratio that is smaller than the first preset ratio and larger than the second preset ratio in a state where the purifying catalyst is not at a temperature where the purifying catalyst is activated during vehicle travelling upon setting the motor travel priority mode to prioritize the motor travel, control the internal combustion engine and the motor so that the internal combustion engine is started up and the hybrid vehicle is driven with the motor travel priority mode while the internal combustion engine is operated in an appropriate state to warming up the purifying catalyst.
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Accused Products
Abstract
A hybrid vehicle that runs in an electric running priority mode after the engine reaches a driving condition appropriate for heating the catalyst (S130-S150) if the system has been started up and the following conditions are met: the vehicle is running in an electric running priority mode in which electric power is used preferentially to drive the vehicle; the temperature (Tc) at which the catalyst becomes activated to purify the engine exhaust falls below a threshold value (Tref); and a battery storage rate (SOC) falls below a threshold value (Scd) which reaches a threshold value (Shv). Then the system switches to a hybrid running priority mode after running on electric power for the length of time necessary to heat the catalyst.
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Citations
8 Claims
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1. A hybrid vehicle, having an internal combustion engine capable of outputting power for driving the hybrid vehicle and equipped in an exhaust system with a catalytic conversion unit including a purifying catalyst for purifying exhaust, a motor constructed to input and output power for driving the hybrid vehicle, a battery unit including at least one secondary battery designed to transmit electric power to and from the motor, and a charger connected to an external power supply in a system shutdown state of the hybrid vehicle to charge the secondary battery of the battery unit with electric power from the external power supply, the hybrid vehicle being capable of:
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motor travel when the hybrid vehicle is driven only with input and output power to and from the motor and hybrid travel when the hybrid vehicle is driven with output power from the internal combustion engine and with the input and output power to and from the motor, the hybrid vehicle comprising; an accumulated charge ratio calculation module configured to calculate an accumulated charge ratio that is a ratio of an accumulated charge amount in the at least one secondary battery of the battery unit to a whole capacity of the at least one secondary battery of the battery unit; a mode setting module configured to, when the calculated accumulated charge ratio is at least larger than a first preset ratio at system startup of the hybrid vehicle, set a motor travel priority mode where the motor travel is prioritized for driving the hybrid vehicle until the calculated accumulated charge ratio becomes less than a second preset ratio that is less than the first preset ratio during vehicle travelling, while setting a hybrid travel priority mode where the hybrid travel is prioritized for driving the hybrid vehicle when the motor travel priority mode is not set; and a control module configured to, when the calculated accumulated charge ratio becomes less than a third preset ratio that is smaller than the first preset ratio and larger than the second preset ratio in a state where the purifying catalyst is not at a temperature where the purifying catalyst is activated during vehicle travelling upon setting the motor travel priority mode to prioritize the motor travel, control the internal combustion engine and the motor so that the internal combustion engine is started up and the hybrid vehicle is driven with the motor travel priority mode while the internal combustion engine is operated in an appropriate state to warming up the purifying catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hybrid vehicle comprising:
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an internal combustion engine; an engine electronic control unit; an exhaust system with a catalytic conversion unit for purifying exhaust of the engine; a motor; a battery unit designed to transmit electric power to and from the motor, wherein the hybrid vehicle is capable of motor travel where the hybrid vehicle is driven only with the motor and hybrid travel where the hybrid vehicle is driven with the internal combustion engine and with the motor; an accumulated charge ratio calculation module configured to calculate an SOC ratio of the battery unit; a motor travel priority mode which prioritizes the motor travel; a hybrid travel priority mode which prioritizes the hybrid travel; and a mode setting module which sets the motor travel priority mode when the SOC ratio is larger than a first preset value and the hybrid motor travel priority mode when the SOC ratio is less than a second preset value that is less than the first preset value; wherein the engine electronic control unit starts up the engine and warms-up the catalytic conversion unit when the SOC ratio becomes less than a third preset ratio that is smaller than the first preset ratio and larger than the second preset ratio while maintaining the motor travel priority mode.
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Specification