发动机启停系统--Stop Start System

Stop/Start System Achieving higher fuel efficiency by combining battery charge control and other systems Lithium-ion Battery Pack Press the button to see your selected product. Tandem Solenoid(TS) Starter for Stop/Start Systems Cold Storage Evaporator Products for Stop/Start System Tandem Solenoid (TS) Starter for Stop/Start Systems Stop/Start systems help increase fuel efficiency by automatically stopping the engine while the vehicle is waiting at stop lights or is stopped for other reasons to save fuel that would be wasted during idling. The Tandem Solenoid (TS) Starter enables the engine to restart more quickly and smoothly. Conventional starters cannot restart the engine while the engine is running down even after the veh ic le has stopped . The TS Star te r , wh ich features DENSO’s unique new mechanisms, can restart the engine during engine coasting, thus reducing the time needed before engine restart by up to about 1 .5 seconds (a 80% dec rease compared with DENSO’s conventional starters). DENSO, which has been making starters since its foundation, started full-scale mass production of starters for Stop/Start systems in 1999. Based on its technologies accumulated over many years, DENSO will continue to improve product reliability and make vehicles more environment-friendly. Solenoid: Consists of a current-carrying coil of wire and a moving iron core. The coil acts as an electromagnet when a current passes through it and the iron core slides along the coil axis. In starters, this component is used as an actuator to thrust the pinion gear forward and a switch to supply power to the motor. ■Benefit Stop/Start systems automatically stop the engine when the vehicle is stopped, and also allow the engine to coast for a while when the engine is instructed to stop. Conventional starters cannot restart the engine until the engine has completely stopped, whereas the TS Starter can restart the engine even while it is coasting. Compared with DENSO’s conventional starters, this advantage reduces the time needed before engine restart by up to 1.5 seconds (a 80% decrease in the time required to restart the engine compared with DENSO’s conventional starters). Re-start during engine run down Re-start time during engine run down Current : Wait then restart → Development : Immediately restart waitingCurrent Current Time （S） Development （TS Starter） Restart demand En gi ne s pe ed Waiting Time▲80％ Re-Start Time Development （TS Starter） Current 1.5 1.0 0.5 0 Up to 1.5 seconds En gi ne r es ta rt t im e (S ) Tandem Solenoid (TS) Starter for Stop/Start Systems ■Feature　The world’s first mechanism to separately control the forward slide of the pinion gear and the energization of the motor Conventional starters thrust the pinion gear (the gear on their front end) forward to engage the ring gear (the mating gear on the engine) to transmit the rotation of the motor to the engine via the pinion gear in order to start the engine. Independent control of pinion gear shift and motor energization by two solenoids Conjunctional control of pinion gear shift and motor energization by one solenoid Tandem Solenoid Starter EMS EMS Solenoid to shift pinion （SL1） Pinion gear Ring gear Engine Speed Solenoid to energize motor （SL2） Ring gear Solenoid EMS：Engine Management System Current Product ●Conventional starter：Has a mechanism to shift the pinion gear and to energize the motor conjunctionally.In this system, the pinion gear cannot mesh with the ring gear until the engine (ring gear) has stopped completely. ●TS Starter：Has the world’s first mechanism to separately control the forward slide of the pinion gear and the energization of the motor. In this system, sliding the pinion gear forward according to engine speed and energizing the motor can be controlled independently, thus allowing the pinion gear to engage the ring gear while the engine (ring gear) is still rotating. Tandem Solenoid (TS) Starter for Stop/Start Systems ■Engineering Key Point　Separately control pinion gear forward movement and motor energization according to engine speed （ rp m ） ⒶMotor on → ⒷPinion shift ⒷPinion shift → ⒶMotor on Restart demand Ⓐ Ⓑ Restart demand ⒶⒷ （S）　 （S）　 200 400 600 800 200 400 600 800 0 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 1.0 Starter Engine Timing of engine restart requests Flow of control ※Engine restart requests: The driver’s actions identified as requests to restart the engine, such as releasing the brake pedal Move the pinion gear forward and then energize the motor. High engine (ring gear) speeds Low engine (ring gear) speeds （ rp m ） Energize the motor to increase the rotational speed of the pinion gear and then move the pinion gear forward when the pinion gear and ring gear are rotating at almost the same rate. Tandem Solenoid (TS) Starter for Stop/Start Systems ■Overview ●Lithium-ion battery cells can store more regenerative electric power. ●The small, lightweight, naturally air-cooled design increases the flexibility of installation. Fuel efficiency can be improved by combining a stop/start system with a regenerative deceleration and braking system which captures the kinetic energy of moving vehicle and converts it into usable electric power instead of being dissipated as heat.To improve energy regeneration efficiency, DENSO has developed a battery pack that can be used with a conventional lead-acid battery. Lithium-ion Battery Pack ■Benefit Lithium-ion Battery Pack Work for electric generation measured in NEDC test Fuel efficiency improved by using DENSO’s lithium-ion battery pack: +3% (NEDC) Vehicle speed Adjusting voltage Battery level No battery charge control performed No fuel consumed Fuel efficiency : +1% Fuel efficiency : ＋3% Deceleration and braking Idling Constant speed Acceleration Fuel consumed 0 50 100 150 200 250(kJ) Battery charge control performed Fuel efficiency can be improved by increasing the capacity to store regenerative electric power produced during deceleration and braking. Lead-acid battery Lithium-ion battery 14.5V Power generation increased Power generation restricted 13.5V 12.5V Idling Acceleration Deceleration and braking Constant speed Charge Discharge Battery level maintained Battery charge control Deceleration and braking Deceleration and braking Lithium-ion Battery Pack Lithium-ion battery pack Internal configuration Voltage characteristics Removed DC-DC converter Alternator Starter Lead-acid battery Electric load Protected loads (navigation and audio systems, electric automatic- transmission-fluid, VSC solenoid, etc.) ・Lithium-ion battery cells selected to match the lead-acid battery characteristics ・Improved regenerative efficiency by enhanced input-output characteristics V ol ta ge ( V ) Lithium-ion battery characteristics Lead-acid battery characteristics Range of the Lithium-ion battery SOC Lead-acid battery side Protected load side Control circuit Lithium-ion battery cell MOS-FET SOC(%) ■Engineering Key Point Cold Storage Evaporator Te m pe ra tu re o f a ir bl ow n fr om th e ai r ou tl et ( °C ) Vehicle traveling Engine restart Conventional Evaporator Cold Storage Evaporator Mode B Mode C Mode A Mode B Duration (sec.) New product (when used in a vehicle with an ISS) 0 5 Previous product (when used in a vehicle with an ISS) New product (when used in a vehicle without an ISS) Fuel efficiency changes depending on the driving conditions. Fuel efficiency improved thanks to a longer duration before engine restart.Start of idle stop Comfort: Doubling the time for which thermal 　　　　 comfort is maintained Fuel efficiency: Fuel efficiency 　　　　　　　　improved by approx. 2% ISS:Idle Stop/Start Approx. twice as long Engine restart ■Overview ■Benefit ●Cold energy is stored in the cold insulator in the heat exchanger of the evaporator while the air conditioning system is working, then cooled air is supplied while the engine is in the idle-stop mode. ●Thermal comfort is improved by limiting the rise in temperature of air supplied while the air conditioning system has stopped working and improving fuel efficiency by lengthening the duration of idle stop (the amount of time before the engine is restarted). Stop/Start is an effective way to improve fuel efficiency, but when the engine is at rest in this state, the air conditioning stops working too. To supply cooled air to the vehicle cabin while the engine is not running, DENSO has developed a new “Cold Storage Evaporator.” Comfortable temperatures Fu el e ffi ci en cy im pr ov ed by id le s to p (% ) Approx. 2% ■Feature Cold Storage Evaporator Some parts of the fins used for the conventional evaporator are replaced with a cold storage case filled with a cold insulator, which is held by refrigerant tubes. Outer fins are held between refrigerant tubes. Cold Storage Evaporator Conventional Evaporator Inclusion pipe Inner fins Improve cold storage capacity High-performance, non-corrosive (two plates jointed together) Cold insulator (paraffin) Plate Cold storage case Outer fins Refrigerant tube Outer fins Refrigerant tube Cold storage case Cold Storage Evaporator ■Engineering Key Point Vehicle traveling (before the completion of cold storage) Storing cold energy while the vehicle is running and discharging it while the vehicle is stopped Mode A Mode B Mode C Use refrigerant to cool the supplied air and the cold insulator. Vehicle traveling (after the completion of cold storage) Use refrigerant to cool the supplied air. During Idle stop Use the cold insulator to cool the supplied air. Air supplied Refrigerant Cold insulator Air supplied Refrigerant Cold insulator Air supplied Cold insulator